diff --git a/pkg/compiler/lib/src/kernel/transformations/late_lowering.dart b/pkg/compiler/lib/src/kernel/transformations/late_lowering.dart
index 63248dcc8b5..d30aef9f84f 100644
--- a/pkg/compiler/lib/src/kernel/transformations/late_lowering.dart
+++ b/pkg/compiler/lib/src/kernel/transformations/late_lowering.dart
@@ -332,7 +332,11 @@ class LateLowering {
           fileUri: fileUri,
           fieldReference: field.fieldReference)
         ..fileOffset = fileOffset
-        ..isNonNullableByDefault = true;
+        ..isNonNullableByDefault = true
+        // TODO(fishythefish,srujzs,johnniwinther): Also mark the getter/setter
+        //  as extension/inline class members.
+        ..isExtensionMember = field.isExtensionMember
+        ..isInlineClassMember = field.isInlineClassMember;
       StaticGet fieldCellAccess() =>
           StaticGet(fieldCell)..fileOffset = fileOffset;
 
diff --git a/pkg/front_end/lib/src/fasta/source/source_constructor_builder.dart b/pkg/front_end/lib/src/fasta/source/source_constructor_builder.dart
index 2720c54b5dc..d72cb1eb503 100644
--- a/pkg/front_end/lib/src/fasta/source/source_constructor_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_constructor_builder.dart
@@ -1100,6 +1100,7 @@ class SourceInlineClassConstructorBuilder
       nameScheme
           .getConstructorMemberName(name, isTearOff: true)
           .attachMember(_constructorTearOff!);
+      _constructorTearOff!.isInlineClassMember = true;
     }
   }
 
diff --git a/pkg/front_end/lib/src/fasta/source/source_field_builder.dart b/pkg/front_end/lib/src/fasta/source/source_field_builder.dart
index d398742a12c..4b8ae053603 100644
--- a/pkg/front_end/lib/src/fasta/source/source_field_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_field_builder.dart
@@ -683,6 +683,10 @@ class RegularFieldEncoding implements FieldEncoding {
       _field
         ..isStatic = true
         ..isExtensionMember = true;
+    } else if (fieldBuilder.isInlineClassMember) {
+      _field
+        ..isStatic = fieldBuilder.isStatic
+        ..isInlineClassMember = true;
     } else {
       bool isInstanceMember =
           !fieldBuilder.isStatic && !fieldBuilder.isTopLevel;
@@ -1081,15 +1085,19 @@ abstract class AbstractLateFieldEncoding implements FieldEncoding {
   @override
   void build(
       SourceLibraryBuilder libraryBuilder, SourceFieldBuilder fieldBuilder) {
-    bool isInstanceMember;
+    bool isInstanceMember = !fieldBuilder.isStatic && !fieldBuilder.isTopLevel;
     bool isExtensionMember = fieldBuilder.isExtensionMember;
+    bool isInlineClassMember = fieldBuilder.isInlineClassMember;
     if (isExtensionMember) {
       _field
         ..isStatic = true
         ..isExtensionMember = isExtensionMember;
       isInstanceMember = false;
+    } else if (isInlineClassMember) {
+      _field
+        ..isStatic = fieldBuilder.isStatic
+        ..isInlineClassMember = true;
     } else {
-      isInstanceMember = !fieldBuilder.isStatic && !fieldBuilder.isTopLevel;
       _field
         ..isStatic = !isInstanceMember
         ..isExtensionMember = false;
@@ -1097,18 +1105,20 @@ abstract class AbstractLateFieldEncoding implements FieldEncoding {
     if (_lateIsSetField != null) {
       _lateIsSetField!
         ..isStatic = !isInstanceMember
-        ..isStatic = _field.isStatic
         ..isExtensionMember = isExtensionMember
+        ..isInlineClassMember = isInlineClassMember
         ..type = libraryBuilder.loader
             .createCoreType('bool', Nullability.nonNullable);
     }
     _lateGetter
       ..isStatic = !isInstanceMember
-      ..isExtensionMember = isExtensionMember;
+      ..isExtensionMember = isExtensionMember
+      ..isInlineClassMember = isInlineClassMember;
     if (_lateSetter != null) {
       _lateSetter!
         ..isStatic = !isInstanceMember
-        ..isExtensionMember = isExtensionMember;
+        ..isExtensionMember = isExtensionMember
+        ..isInlineClassMember = isInlineClassMember;
     }
   }
 
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.expect
index c10c1d70ab1..8f2093f5b58 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.expect
@@ -302,17 +302,17 @@ Try changing the operand or remove the type arguments.
   f3<int>; // error
     ^";
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void {};
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic {
   self::method<self::Class, core::int>(new self::Class::•(), 0, new self::Class::•(), 0);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.transformed.expect
index c10c1d70ab1..8f2093f5b58 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.strong.transformed.expect
@@ -302,17 +302,17 @@ Try changing the operand or remove the type arguments.
   f3<int>; // error
     ^";
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void {};
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic {
   self::method<self::Class, core::int>(new self::Class::•(), 0, new self::Class::•(), 0);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.expect
index c10c1d70ab1..8f2093f5b58 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.expect
@@ -302,17 +302,17 @@ Try changing the operand or remove the type arguments.
   f3<int>; // error
     ^";
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void {};
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic {
   self::method<self::Class, core::int>(new self::Class::•(), 0, new self::Class::•(), 0);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.modular.expect
index c10c1d70ab1..8f2093f5b58 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.modular.expect
@@ -302,17 +302,17 @@ Try changing the operand or remove the type arguments.
   f3<int>; // error
     ^";
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void {};
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic {
   self::method<self::Class, core::int>(new self::Class::•(), 0, new self::Class::•(), 0);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.outline.expect
index a34beecdfe0..9f2f85f8b0f 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.outline.expect
@@ -126,21 +126,21 @@ static method method<T extends self::Class, S extends core::int>(self::Class c,
   ;
 static method test<T extends self::Class?, S extends core::int>(self::Class? c1, self::GetterCall c2, core::int? i, self::test::T% t1, self::test::T? t2, self::test::S? s, <T extends core::Object? = dynamic>() →? void f1, Never n, dynamic d, core::String a, core::double b, core::bool c, FutureOr<self::Class>f2, core::Function f3) → dynamic
   ;
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
   ;
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   ;
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void
   ;
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic
   ;
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic
   ;
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.transformed.expect
index c10c1d70ab1..8f2093f5b58 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/callable_instantiation.dart.weak.transformed.expect
@@ -302,17 +302,17 @@ Try changing the operand or remove the type arguments.
   f3<int>; // error
     ^";
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method Extension|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Extension|call<T%>(#this);
-static method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method ExtensionGetter|get#call(lowered final core::double #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void {};
-static method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
-static method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method ExtensionSetter|set#call(lowered final core::bool #this, <T extends core::Object? = dynamic>() → void value) → void {}
+static extension-member method Ambiguous1|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous1|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous1|call<T%>(#this);
-static method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
-static method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method Ambiguous2|call<T extends core::Object? = dynamic>(lowered final core::String #this) → dynamic {}
+static extension-member method Ambiguous2|get#call(lowered final core::String #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::Ambiguous2|call<T%>(#this);
 static method main() → dynamic {
   self::method<self::Class, core::int>(new self::Class::•(), 0, new self::Class::•(), 0);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
index b9239ee807c..b327654d0dc 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.expect
@@ -61,13 +61,13 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   return value;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   return value;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   return value;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void {
+static extension-member method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f1 = #C6;
   core::String f1TypeName = #C6.{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
   (core::int) → core::int f2 = self::Ext|get#einst(#this)<core::int>;
@@ -75,7 +75,7 @@ static method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f3 = self::Ext|get#einst(#this)<core::int>;
   core::String f3TypeName = (self::Ext|get#einst(#this)<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void {
   core::Type t1 = #C7;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
index 863b6736298..17bf742577f 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.strong.transformed.expect
@@ -69,13 +69,13 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   return value;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   return value;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   return value;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void {
+static extension-member method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f1 = #C6;
   core::String f1TypeName = #C6.{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
   (core::int) → core::int f2 = self::Ext|get#einst(#this)<core::int>;
@@ -83,7 +83,7 @@ static method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f3 = self::Ext|get#einst(#this)<core::int>;
   core::String f3TypeName = (self::Ext|get#einst(#this)<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void {
   core::Type t1 = #C7;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
index 28a0c3fbd21..afce67e9176 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.expect
@@ -61,13 +61,13 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   return value;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   return value;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   return value;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void {
+static extension-member method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f1 = #C6;
   core::String f1TypeName = #C6.{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
   (core::int) → core::int f2 = self::Ext|get#einst(#this)<core::int>;
@@ -75,7 +75,7 @@ static method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f3 = self::Ext|get#einst(#this)<core::int>;
   core::String f3TypeName = (self::Ext|get#einst(#this)<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void {
   core::Type t1 = #C7;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.modular.expect
index 28a0c3fbd21..afce67e9176 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.modular.expect
@@ -61,13 +61,13 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   return value;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   return value;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   return value;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void {
+static extension-member method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f1 = #C6;
   core::String f1TypeName = #C6.{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
   (core::int) → core::int f2 = self::Ext|get#einst(#this)<core::int>;
@@ -75,7 +75,7 @@ static method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f3 = self::Ext|get#einst(#this)<core::int>;
   core::String f3TypeName = (self::Ext|get#einst(#this)<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void {
   core::Type t1 = #C7;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
index 8d649ded8b7..987feed37f4 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.outline.expect
@@ -45,15 +45,15 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   ;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   ;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   ;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void
+static extension-member method Ext|emethod(lowered final self::C #this) → void
   ;
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
index 8eeea6f3165..dd4a859360b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/explicit_instantiation.dart.weak.transformed.expect
@@ -69,13 +69,13 @@ extension Ext on self::C {
 }
 static method top<T extends core::Object? = dynamic>(self::top::T% value) → self::top::T%
   return value;
-static method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
+static extension-member method Ext|estat<T extends core::Object? = dynamic>(self::Ext|estat::T% value) → self::Ext|estat::T%
   return value;
-static method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
+static extension-member method Ext|einst<T extends core::Object? = dynamic>(lowered final self::C #this, self::Ext|einst::T% value) → self::Ext|einst::T%
   return value;
-static method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Ext|get#einst(lowered final self::C #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% value) → T% => self::Ext|einst<T%>(#this, value);
-static method Ext|emethod(lowered final self::C #this) → void {
+static extension-member method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f1 = #C6;
   core::String f1TypeName = #C6.{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
   (core::int) → core::int f2 = self::Ext|get#einst(#this)<core::int>;
@@ -83,7 +83,7 @@ static method Ext|emethod(lowered final self::C #this) → void {
   (core::int) → core::int f3 = self::Ext|get#einst(#this)<core::int>;
   core::String f3TypeName = (self::Ext|get#einst(#this)<core::int>).{core::Object::runtimeType}{core::Type}.{core::Type::toString}(){() → core::String};
 }
-static method Ext|get#emethod(lowered final self::C #this) → () → void
+static extension-member method Ext|get#emethod(lowered final self::C #this) → () → void
   return () → void => self::Ext|emethod(#this);
 static method main() → void {
   core::Type t1 = #C7;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.expect
index 7708d538136..840cf199cc9 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.expect
@@ -30,9 +30,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/issue46719.dart:24:10: Error: A constructor tear-off can't have type arguments after the constructor name.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.transformed.expect
index 48a3e9eb24b..c4ad8da5d8f 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.strong.transformed.expect
@@ -30,9 +30,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return core::_GrowableList::_literal1<self::m::X%>(x);
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/issue46719.dart:24:10: Error: A constructor tear-off can't have type arguments after the constructor name.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.expect
index 25c627aeec7..6611da17472 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.expect
@@ -30,9 +30,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/issue46719.dart:24:10: Error: A constructor tear-off can't have type arguments after the constructor name.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.modular.expect
index 25c627aeec7..6611da17472 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.modular.expect
@@ -30,9 +30,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/issue46719.dart:24:10: Error: A constructor tear-off can't have type arguments after the constructor name.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.outline.expect
index 4c8e7ba6c96..bf702b14b0c 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.outline.expect
@@ -20,9 +20,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   ;
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   ;
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.transformed.expect
index 7137cf6451f..6a239e8eb00 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/issue46719.dart.weak.transformed.expect
@@ -30,9 +30,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return core::_GrowableList::_literal1<self::m::X%>(x);
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/issue46719.dart:24:10: Error: A constructor tear-off can't have type arguments after the constructor name.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.expect
index aabdb4c3e14..f04cc046fa2 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.expect
@@ -199,10 +199,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.transformed.expect
index ab2421a84b1..0f3cead9fa7 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.strong.transformed.expect
@@ -199,10 +199,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.expect
index aabdb4c3e14..f04cc046fa2 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.expect
@@ -199,10 +199,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.modular.expect
index aabdb4c3e14..f04cc046fa2 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.modular.expect
@@ -199,10 +199,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.outline.expect
index 43c57222a93..b0e57697818 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.outline.expect
@@ -44,11 +44,11 @@ extension E on core::int {
 }
 static field core::int new;
 static field self::C c;
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
   ;
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   ;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.transformed.expect
index ab2421a84b1..0f3cead9fa7 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/new_as_selector.dart.weak.transformed.expect
@@ -199,10 +199,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.expect
index 6bcff05130e..b3e58b04b9b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.expect
@@ -25,8 +25,8 @@ extension Extension on core::Function {
   tearoff unresolvedConstructor = self::Extension|get#unresolvedConstructor;
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic {}
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic {
   self::UnresolvedClass<dynamic>();
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.transformed.expect
index 6bcff05130e..b3e58b04b9b 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.strong.transformed.expect
@@ -25,8 +25,8 @@ extension Extension on core::Function {
   tearoff unresolvedConstructor = self::Extension|get#unresolvedConstructor;
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic {}
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic {
   self::UnresolvedClass<dynamic>();
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.expect
index 7f21a73ee6e..b943cd7f94a 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.expect
@@ -25,8 +25,8 @@ extension Extension on core::Function {
   tearoff unresolvedConstructor = self::Extension|get#unresolvedConstructor;
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic {}
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic {
   self::UnresolvedClass<dynamic>();
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.modular.expect
index 7f21a73ee6e..b943cd7f94a 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.modular.expect
@@ -25,8 +25,8 @@ extension Extension on core::Function {
   tearoff unresolvedConstructor = self::Extension|get#unresolvedConstructor;
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic {}
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic {
   self::UnresolvedClass<dynamic>();
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.outline.expect
index 0b1b0612986..a847bb22a27 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.outline.expect
@@ -26,9 +26,9 @@ extension Extension on core::Function {
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic
   ;
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic
   ;
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.transformed.expect
index 7f21a73ee6e..b943cd7f94a 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/not_unresolved_constructor_invocation.dart.weak.transformed.expect
@@ -25,8 +25,8 @@ extension Extension on core::Function {
   tearoff unresolvedConstructor = self::Extension|get#unresolvedConstructor;
 }
 static method UnresolvedClass<T extends core::Object? = dynamic>() → dynamic {}
-static method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
-static method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
+static extension-member method Extension|unresolvedConstructor(lowered final core::Function #this) → dynamic {}
+static extension-member method Extension|get#unresolvedConstructor(lowered final core::Function #this) → () → dynamic
   return () → dynamic => self::Extension|unresolvedConstructor(#this);
 static method main() → dynamic {
   self::UnresolvedClass<dynamic>();
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.expect
index efefcf8c107..2cddcc66296 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.expect
@@ -75,9 +75,9 @@ static field core::List<void> v2 = <void>[];
 static final field core::String v3 = throw "Anything";
 static const field core::List<self::C> v4 = #C5;
 static const field core::Map<core::Type, core::Type> v5 = #C7;
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   return t;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic {
   core::List<self::C> v8 = <self::C>[];
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.transformed.expect
index efefcf8c107..2cddcc66296 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.strong.transformed.expect
@@ -75,9 +75,9 @@ static field core::List<void> v2 = <void>[];
 static final field core::String v3 = throw "Anything";
 static const field core::List<self::C> v4 = #C5;
 static const field core::Map<core::Type, core::Type> v5 = #C7;
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   return t;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic {
   core::List<self::C> v8 = <self::C>[];
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.expect
index e0bf00bb4cf..09126fd0661 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.expect
@@ -75,9 +75,9 @@ static field core::List<void> v2 = <void>[];
 static final field core::String v3 = throw "Anything";
 static const field core::List<self::C> v4 = #C5;
 static const field core::Map<core::Type, core::Type> v5 = #C7;
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   return t;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic {
   core::List<self::C> v8 = <self::C>[];
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.modular.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.modular.expect
index e0bf00bb4cf..09126fd0661 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.modular.expect
@@ -75,9 +75,9 @@ static field core::List<void> v2 = <void>[];
 static final field core::String v3 = throw "Anything";
 static const field core::List<self::C> v4 = #C5;
 static const field core::Map<core::Type, core::Type> v5 = #C7;
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   return t;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic {
   core::List<self::C> v8 = <self::C>[];
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.outline.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.outline.expect
index 0b59d3fd21e..c496042a837 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.outline.expect
@@ -71,9 +71,9 @@ static field core::List<void> v2;
 static final field core::String v3;
 static const field core::List<self::C> v4 = const <self::C>[];
 static const field core::Map<core::Type, core::Type> v5 = const <core::Type, core::Type>{dynamic: dynamic};
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   ;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.transformed.expect b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.transformed.expect
index e0bf00bb4cf..09126fd0661 100644
--- a/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/generic_usage_type_variable.dart.weak.transformed.expect
@@ -75,9 +75,9 @@ static field core::List<void> v2 = <void>[];
 static final field core::String v3 = throw "Anything";
 static const field core::List<self::C> v4 = #C5;
 static const field core::Map<core::Type, core::Type> v5 = #C7;
-static method E|foo(lowered final dynamic #this, dynamic t) → dynamic
+static extension-member method E|foo(lowered final dynamic #this, dynamic t) → dynamic
   return t;
-static method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
+static extension-member method E|get#foo(lowered final dynamic #this) → (dynamic) → dynamic
   return (dynamic t) → dynamic => self::E|foo(#this, t);
 static method main() → dynamic {
   core::List<self::C> v8 = <self::C>[];
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
index ea0c0641cc3..cc6717eaf30 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.strong.transformed.expect
@@ -33,28 +33,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
   self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.modular.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
index 094df2b4c4d..8a093a7a627 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.outline.expect
@@ -31,28 +31,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void
   ;
 
diff --git a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
index ea0c0641cc3..cc6717eaf30 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/external.dart.weak.transformed.expect
@@ -33,28 +33,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
   self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.modular.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
index 0c29b66e6a1..a2c96492968 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   ;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   ;
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J
   ;
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   ;
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
   ;
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
index ea0c0641cc3..cc6717eaf30 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.strong.transformed.expect
@@ -33,28 +33,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
   self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
index 959ed17c42a..5c5e6e19da2 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.modular.expect
@@ -32,28 +32,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
index 6e3d7b45c1f..b4b5a9610c7 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.outline.expect
@@ -31,28 +31,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void
   ;
 
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
index ea0c0641cc3..cc6717eaf30 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/external.dart.weak.transformed.expect
@@ -33,28 +33,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => js_2::_callMethodUnchecked0<self::A>(#this, "method");
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => js_2::callMethod<T%>(#this, "genericMethod", <dynamic>[t]);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), a);
   self::B b2 = js_2::_callConstructorUnchecked1<self::B>(js_2::_getPropertyTrustType<core::Object>(js_2::globalThis, "B"), 0);
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.modular.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
index 0c29b66e6a1..a2c96492968 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   ;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   ;
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J
   ;
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   ;
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
   ;
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/dartdevc/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.strong.expect b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.strong.expect
index 0d916c055c6..81fdc0d2773 100644
--- a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.strong.expect
@@ -24,8 +24,8 @@ extension E on self::A {
   get bar = self::E|get#bar;
   set foo = self::E|set#foo;
 }
-static method E|set#foo(lowered final self::A #this, core::int value) → void {}
-static method E|get#bar(lowered final self::A #this) → core::int
+static extension-member method E|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|get#bar(lowered final self::A #this) → core::int
   return 42;
 static method test(self::E e) → dynamic {
   self::E|set#foo(e, 42);
diff --git a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.expect b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.expect
index 0d916c055c6..81fdc0d2773 100644
--- a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.expect
@@ -24,8 +24,8 @@ extension E on self::A {
   get bar = self::E|get#bar;
   set foo = self::E|set#foo;
 }
-static method E|set#foo(lowered final self::A #this, core::int value) → void {}
-static method E|get#bar(lowered final self::A #this) → core::int
+static extension-member method E|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|get#bar(lowered final self::A #this) → core::int
   return 42;
 static method test(self::E e) → dynamic {
   self::E|set#foo(e, 42);
diff --git a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.modular.expect
index 0d916c055c6..81fdc0d2773 100644
--- a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.modular.expect
@@ -24,8 +24,8 @@ extension E on self::A {
   get bar = self::E|get#bar;
   set foo = self::E|set#foo;
 }
-static method E|set#foo(lowered final self::A #this, core::int value) → void {}
-static method E|get#bar(lowered final self::A #this) → core::int
+static extension-member method E|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|get#bar(lowered final self::A #this) → core::int
   return 42;
 static method test(self::E e) → dynamic {
   self::E|set#foo(e, 42);
diff --git a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.outline.expect
index 36d79144532..d298840e887 100644
--- a/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/access_setter_as_getter.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension E on self::A {
   get bar = self::E|get#bar;
   set foo = self::E|set#foo;
 }
-static method E|set#foo(lowered final self::A #this, core::int value) → void
+static extension-member method E|set#foo(lowered final self::A #this, core::int value) → void
   ;
-static method E|get#bar(lowered final self::A #this) → core::int
+static extension-member method E|get#bar(lowered final self::A #this) → core::int
   ;
 static method test(self::E e) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.strong.expect b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.strong.expect
index da7acd98904..2bfa2f536b4 100644
--- a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.strong.expect
@@ -11,8 +11,8 @@ extension E on self::A? {
   method foo = self::E|foo;
   tearoff foo = self::E|get#foo;
 }
-static method E|foo(lowered final self::A? #this) → void {}
-static method E|get#foo(lowered final self::A? #this) → () → void
+static extension-member method E|foo(lowered final self::A? #this) → void {}
+static extension-member method E|get#foo(lowered final self::A? #this) → () → void
   return () → void => self::E|foo(#this);
 static method bar(self::E e) → dynamic
   return self::E|foo(e);
diff --git a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.expect b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.expect
index da7acd98904..2bfa2f536b4 100644
--- a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.expect
@@ -11,8 +11,8 @@ extension E on self::A? {
   method foo = self::E|foo;
   tearoff foo = self::E|get#foo;
 }
-static method E|foo(lowered final self::A? #this) → void {}
-static method E|get#foo(lowered final self::A? #this) → () → void
+static extension-member method E|foo(lowered final self::A? #this) → void {}
+static extension-member method E|get#foo(lowered final self::A? #this) → () → void
   return () → void => self::E|foo(#this);
 static method bar(self::E e) → dynamic
   return self::E|foo(e);
diff --git a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.modular.expect
index da7acd98904..2bfa2f536b4 100644
--- a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.modular.expect
@@ -11,8 +11,8 @@ extension E on self::A? {
   method foo = self::E|foo;
   tearoff foo = self::E|get#foo;
 }
-static method E|foo(lowered final self::A? #this) → void {}
-static method E|get#foo(lowered final self::A? #this) → () → void
+static extension-member method E|foo(lowered final self::A? #this) → void {}
+static extension-member method E|get#foo(lowered final self::A? #this) → () → void
   return () → void => self::E|foo(#this);
 static method bar(self::E e) → dynamic
   return self::E|foo(e);
diff --git a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.outline.expect
index cfff52c6697..bcaa961af17 100644
--- a/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/extension_on_nullable.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension E on self::A? {
   method foo = self::E|foo;
   tearoff foo = self::E|get#foo;
 }
-static method E|foo(lowered final self::A? #this) → void
+static extension-member method E|foo(lowered final self::A? #this) → void
   ;
-static method E|get#foo(lowered final self::A? #this) → () → void
+static extension-member method E|get#foo(lowered final self::A? #this) → () → void
   return () → void => self::E|foo(#this);
 static method bar(self::E e) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.expect
index c7161fb894a..ec0446985da 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.expect
@@ -11,8 +11,8 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic {}
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic {}
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic {
   self::type|method(new self::A::•());
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.transformed.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.transformed.expect
index c7161fb894a..ec0446985da 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.strong.transformed.expect
@@ -11,8 +11,8 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic {}
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic {}
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic {
   self::type|method(new self::A::•());
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.expect
index c7161fb894a..ec0446985da 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.expect
@@ -11,8 +11,8 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic {}
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic {}
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic {
   self::type|method(new self::A::•());
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.modular.expect
index c7161fb894a..ec0446985da 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.modular.expect
@@ -11,8 +11,8 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic {}
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic {}
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic {
   self::type|method(new self::A::•());
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.outline.expect
index 745dd27714f..adab9c5e783 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic
   ;
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.transformed.expect b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.transformed.expect
index c7161fb894a..ec0446985da 100644
--- a/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/extension_with_name_type.dart.weak.transformed.expect
@@ -11,8 +11,8 @@ extension type on self::A {
   method method = self::type|method;
   tearoff method = self::type|get#method;
 }
-static method type|method(lowered final self::A #this) → dynamic {}
-static method type|get#method(lowered final self::A #this) → () → dynamic
+static extension-member method type|method(lowered final self::A #this) → dynamic {}
+static extension-member method type|get#method(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::type|method(#this);
 static method test() → dynamic {
   self::type|method(new self::A::•());
diff --git a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.strong.expect
index ba960fe4b1c..c3bb261b5a2 100644
--- a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.strong.expect
@@ -44,9 +44,9 @@ extension E on self::A {
 extension type ET on self::A {
   get baz = self::ET|get#baz;
 }
-static method E|get#bar(lowered final self::A #this) → core::double
+static extension-member method E|get#bar(lowered final self::A #this) → core::double
   return 3.14;
-static method ET|get#baz(lowered final self::A #this) → core::String
+static extension-member method ET|get#baz(lowered final self::A #this) → core::String
   return "baz";
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}{core::int};
diff --git a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.expect
index ba960fe4b1c..c3bb261b5a2 100644
--- a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.expect
@@ -44,9 +44,9 @@ extension E on self::A {
 extension type ET on self::A {
   get baz = self::ET|get#baz;
 }
-static method E|get#bar(lowered final self::A #this) → core::double
+static extension-member method E|get#bar(lowered final self::A #this) → core::double
   return 3.14;
-static method ET|get#baz(lowered final self::A #this) → core::String
+static extension-member method ET|get#baz(lowered final self::A #this) → core::String
   return "baz";
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}{core::int};
diff --git a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.modular.expect
index ba960fe4b1c..c3bb261b5a2 100644
--- a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.modular.expect
@@ -44,9 +44,9 @@ extension E on self::A {
 extension type ET on self::A {
   get baz = self::ET|get#baz;
 }
-static method E|get#bar(lowered final self::A #this) → core::double
+static extension-member method E|get#bar(lowered final self::A #this) → core::double
   return 3.14;
-static method ET|get#baz(lowered final self::A #this) → core::String
+static extension-member method ET|get#baz(lowered final self::A #this) → core::String
   return "baz";
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}{core::int};
diff --git a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.outline.expect
index 9a61b2a990b..7c5bbed3316 100644
--- a/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_getter_resolution.dart.weak.outline.expect
@@ -14,9 +14,9 @@ extension E on self::A {
 extension type ET on self::A {
   get baz = self::ET|get#baz;
 }
-static method E|get#bar(lowered final self::A #this) → core::double
+static extension-member method E|get#bar(lowered final self::A #this) → core::double
   ;
-static method ET|get#baz(lowered final self::A #this) → core::String
+static extension-member method ET|get#baz(lowered final self::A #this) → core::String
   ;
 static method test(self::A a, self::E e, self::ET et) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.strong.expect
index fe812e2f8a5..4930ac02a1e 100644
--- a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.strong.expect
@@ -45,13 +45,13 @@ extension type ET on self::A {
   method baz = self::ET|baz;
   tearoff baz = self::ET|get#baz;
 }
-static method E|bar(lowered final self::A #this) → void
+static extension-member method E|bar(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method E|get#bar(lowered final self::A #this) → () → void
+static extension-member method E|get#bar(lowered final self::A #this) → () → void
   return () → void => self::E|bar(#this);
-static method ET|baz(lowered final self::A #this) → void
+static extension-member method ET|baz(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method ET|get#baz(lowered final self::A #this) → () → void
+static extension-member method ET|get#baz(lowered final self::A #this) → () → void
   return () → void => self::ET|baz(#this);
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}(){() → void};
diff --git a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.expect
index fe812e2f8a5..4930ac02a1e 100644
--- a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.expect
@@ -45,13 +45,13 @@ extension type ET on self::A {
   method baz = self::ET|baz;
   tearoff baz = self::ET|get#baz;
 }
-static method E|bar(lowered final self::A #this) → void
+static extension-member method E|bar(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method E|get#bar(lowered final self::A #this) → () → void
+static extension-member method E|get#bar(lowered final self::A #this) → () → void
   return () → void => self::E|bar(#this);
-static method ET|baz(lowered final self::A #this) → void
+static extension-member method ET|baz(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method ET|get#baz(lowered final self::A #this) → () → void
+static extension-member method ET|get#baz(lowered final self::A #this) → () → void
   return () → void => self::ET|baz(#this);
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}(){() → void};
diff --git a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.modular.expect
index fe812e2f8a5..4930ac02a1e 100644
--- a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.modular.expect
@@ -45,13 +45,13 @@ extension type ET on self::A {
   method baz = self::ET|baz;
   tearoff baz = self::ET|get#baz;
 }
-static method E|bar(lowered final self::A #this) → void
+static extension-member method E|bar(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method E|get#bar(lowered final self::A #this) → () → void
+static extension-member method E|get#bar(lowered final self::A #this) → () → void
   return () → void => self::E|bar(#this);
-static method ET|baz(lowered final self::A #this) → void
+static extension-member method ET|baz(lowered final self::A #this) → void
   return #this.{self::A::foo}(){() → void};
-static method ET|get#baz(lowered final self::A #this) → () → void
+static extension-member method ET|get#baz(lowered final self::A #this) → () → void
   return () → void => self::ET|baz(#this);
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::foo}(){() → void};
diff --git a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.outline.expect
index 15e19285d00..65f68665f09 100644
--- a/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_method_resolution.dart.weak.outline.expect
@@ -16,13 +16,13 @@ extension type ET on self::A {
   method baz = self::ET|baz;
   tearoff baz = self::ET|get#baz;
 }
-static method E|bar(lowered final self::A #this) → void
+static extension-member method E|bar(lowered final self::A #this) → void
   ;
-static method E|get#bar(lowered final self::A #this) → () → void
+static extension-member method E|get#bar(lowered final self::A #this) → () → void
   return () → void => self::E|bar(#this);
-static method ET|baz(lowered final self::A #this) → void
+static extension-member method ET|baz(lowered final self::A #this) → void
   ;
-static method ET|get#baz(lowered final self::A #this) → () → void
+static extension-member method ET|get#baz(lowered final self::A #this) → () → void
   return () → void => self::ET|baz(#this);
 static method test(self::A a, self::E e, self::ET et) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.strong.expect
index 14cfe288d92..7b55b0c9c9f 100644
--- a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.strong.expect
@@ -79,9 +79,9 @@ extension E on self::A {
 extension type ET on self::A {
   operator ~/ = self::ET|~/;
 }
-static method E|+(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method E|+(lowered final self::A #this, dynamic other) → dynamic
   return 42;
-static method ET|~/(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method ET|~/(lowered final self::A #this, dynamic other) → dynamic
   return 42;
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::*}("foobar"){(dynamic) → dynamic};
diff --git a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.expect
index 14cfe288d92..7b55b0c9c9f 100644
--- a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.expect
@@ -79,9 +79,9 @@ extension E on self::A {
 extension type ET on self::A {
   operator ~/ = self::ET|~/;
 }
-static method E|+(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method E|+(lowered final self::A #this, dynamic other) → dynamic
   return 42;
-static method ET|~/(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method ET|~/(lowered final self::A #this, dynamic other) → dynamic
   return 42;
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::*}("foobar"){(dynamic) → dynamic};
diff --git a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.modular.expect
index 14cfe288d92..7b55b0c9c9f 100644
--- a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.modular.expect
@@ -79,9 +79,9 @@ extension E on self::A {
 extension type ET on self::A {
   operator ~/ = self::ET|~/;
 }
-static method E|+(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method E|+(lowered final self::A #this, dynamic other) → dynamic
   return 42;
-static method ET|~/(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method ET|~/(lowered final self::A #this, dynamic other) → dynamic
   return 42;
 static method test(self::A a, self::E e, self::ET et) → dynamic {
   a.{self::A::*}("foobar"){(dynamic) → dynamic};
diff --git a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.outline.expect
index 269700cb9f3..f0ce1896855 100644
--- a/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_operator_resolution.dart.weak.outline.expect
@@ -20,9 +20,9 @@ extension E on self::A {
 extension type ET on self::A {
   operator ~/ = self::ET|~/;
 }
-static method E|+(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method E|+(lowered final self::A #this, dynamic other) → dynamic
   ;
-static method ET|~/(lowered final self::A #this, dynamic other) → dynamic
+static extension-member method ET|~/(lowered final self::A #this, dynamic other) → dynamic
   ;
 static method test(self::A a, self::E e, self::ET et) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.strong.expect
index 47019f03122..55db36b537c 100644
--- a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.strong.expect
@@ -45,8 +45,8 @@ extension E on self::A {
 extension type ET on self::A {
   set baz = self::ET|set#baz;
 }
-static method E|set#bar(lowered final self::A #this, core::int value) → void {}
-static method ET|set#baz(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|set#bar(lowered final self::A #this, core::int value) → void {}
+static extension-member method ET|set#baz(lowered final self::A #this, core::int value) → void {}
 static method test(self::A a, self::E e) → dynamic {
   a.{self::A::foo} = 42;
   self::E|set#bar(a, 42);
diff --git a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.expect
index 47019f03122..55db36b537c 100644
--- a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.expect
@@ -45,8 +45,8 @@ extension E on self::A {
 extension type ET on self::A {
   set baz = self::ET|set#baz;
 }
-static method E|set#bar(lowered final self::A #this, core::int value) → void {}
-static method ET|set#baz(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|set#bar(lowered final self::A #this, core::int value) → void {}
+static extension-member method ET|set#baz(lowered final self::A #this, core::int value) → void {}
 static method test(self::A a, self::E e) → dynamic {
   a.{self::A::foo} = 42;
   self::E|set#bar(a, 42);
diff --git a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.modular.expect
index 47019f03122..55db36b537c 100644
--- a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.modular.expect
@@ -45,8 +45,8 @@ extension E on self::A {
 extension type ET on self::A {
   set baz = self::ET|set#baz;
 }
-static method E|set#bar(lowered final self::A #this, core::int value) → void {}
-static method ET|set#baz(lowered final self::A #this, core::int value) → void {}
+static extension-member method E|set#bar(lowered final self::A #this, core::int value) → void {}
+static extension-member method ET|set#baz(lowered final self::A #this, core::int value) → void {}
 static method test(self::A a, self::E e) → dynamic {
   a.{self::A::foo} = 42;
   self::E|set#bar(a, 42);
diff --git a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.outline.expect
index 50d6bab4a1f..0c2c9a30e1f 100644
--- a/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_setter_resolution.dart.weak.outline.expect
@@ -14,9 +14,9 @@ extension E on self::A {
 extension type ET on self::A {
   set baz = self::ET|set#baz;
 }
-static method E|set#bar(lowered final self::A #this, core::int value) → void
+static extension-member method E|set#bar(lowered final self::A #this, core::int value) → void
   ;
-static method ET|set#baz(lowered final self::A #this, core::int value) → void
+static extension-member method ET|set#baz(lowered final self::A #this, core::int value) → void
   ;
 static method test(self::A a, self::E e) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.strong.expect
index 6a3340b8430..0da34b66aad 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.strong.expect
@@ -79,7 +79,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
   e3.isEven; // Error.
      ^^^^^^" in e3{<unresolved>}.isEven;
 }
-static method MyInt|get#twice(lowered final core::int #this) → core::int
+static extension-member method MyInt|get#twice(lowered final core::int #this) → core::int
   return 2.{core::num::*}(#this){(core::num) → core::int};
 static method test() → dynamic {
   self::MyInt m = 42;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.expect
index 6a3340b8430..0da34b66aad 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.expect
@@ -79,7 +79,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
   e3.isEven; // Error.
      ^^^^^^" in e3{<unresolved>}.isEven;
 }
-static method MyInt|get#twice(lowered final core::int #this) → core::int
+static extension-member method MyInt|get#twice(lowered final core::int #this) → core::int
   return 2.{core::num::*}(#this){(core::num) → core::int};
 static method test() → dynamic {
   self::MyInt m = 42;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.modular.expect
index 6a3340b8430..0da34b66aad 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.modular.expect
@@ -79,7 +79,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
   e3.isEven; // Error.
      ^^^^^^" in e3{<unresolved>}.isEven;
 }
-static method MyInt|get#twice(lowered final core::int #this) → core::int
+static extension-member method MyInt|get#twice(lowered final core::int #this) → core::int
   return 2.{core::num::*}(#this){(core::num) → core::int};
 static method test() → dynamic {
   self::MyInt m = 42;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.outline.expect
index 74097cf3c17..f2cea8fcf20 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide.dart.weak.outline.expect
@@ -17,7 +17,7 @@ static method test2(self::E2 e2) → dynamic
   ;
 static method test3(self::E3 e3) → dynamic
   ;
-static method MyInt|get#twice(lowered final core::int #this) → core::int
+static extension-member method MyInt|get#twice(lowered final core::int #this) → core::int
   ;
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.expect
index 6bbd2aa60d0..ab7d8516f50 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.expect
@@ -31,29 +31,29 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int {
+static extension-member method E1|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:6:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Error.
       ^" in null;
 }
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int {
+static extension-member method E2|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:10:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Ok.
       ^" in null;
 }
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int {
+static extension-member method E2|floor(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:11:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int floor() {} // Error.
       ^" in null;
 }
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   return throw 42;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   return throw 42;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.transformed.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.transformed.expect
index 6bbd2aa60d0..ab7d8516f50 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.strong.transformed.expect
@@ -31,29 +31,29 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int {
+static extension-member method E1|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:6:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Error.
       ^" in null;
 }
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int {
+static extension-member method E2|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:10:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Ok.
       ^" in null;
 }
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int {
+static extension-member method E2|floor(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:11:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int floor() {} // Error.
       ^" in null;
 }
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   return throw 42;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   return throw 42;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.expect
index 6bbd2aa60d0..ab7d8516f50 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.expect
@@ -31,29 +31,29 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int {
+static extension-member method E1|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:6:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Error.
       ^" in null;
 }
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int {
+static extension-member method E2|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:10:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Ok.
       ^" in null;
 }
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int {
+static extension-member method E2|floor(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:11:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int floor() {} // Error.
       ^" in null;
 }
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   return throw 42;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   return throw 42;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.modular.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.modular.expect
index 6bbd2aa60d0..ab7d8516f50 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.modular.expect
@@ -31,29 +31,29 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int {
+static extension-member method E1|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:6:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Error.
       ^" in null;
 }
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int {
+static extension-member method E2|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:10:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Ok.
       ^" in null;
 }
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int {
+static extension-member method E2|floor(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:11:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int floor() {} // Error.
       ^" in null;
 }
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   return throw 42;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   return throw 42;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.outline.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.outline.expect
index 32a49555c7e..eccbeeda9d2 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.outline.expect
@@ -16,21 +16,21 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int
+static extension-member method E1|ceil(lowered final core::int #this) → core::int
   ;
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int
+static extension-member method E2|ceil(lowered final core::int #this) → core::int
   ;
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int
+static extension-member method E2|floor(lowered final core::int #this) → core::int
   ;
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   ;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.transformed.expect b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.transformed.expect
index 6bbd2aa60d0..ab7d8516f50 100644
--- a/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart.weak.transformed.expect
@@ -31,29 +31,29 @@ extension E3 on core::int hide-getters core::int::isEven {
   get isOdd = self::E3|get#isOdd;
   get isEven = self::E3|get#isEven;
 }
-static method E1|ceil(lowered final core::int #this) → core::int {
+static extension-member method E1|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:6:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Error.
       ^" in null;
 }
-static method E1|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E1|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E1|ceil(#this);
-static method E2|ceil(lowered final core::int #this) → core::int {
+static extension-member method E2|ceil(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:10:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int ceil() {} // Ok.
       ^" in null;
 }
-static method E2|get#ceil(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#ceil(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|ceil(#this);
-static method E2|floor(lowered final core::int #this) → core::int {
+static extension-member method E2|floor(lowered final core::int #this) → core::int {
   return invalid-expression "pkg/front_end/testcases/extension_types/simple_show_hide_conflicts.dart:11:7: Error: A non-null value must be returned since the return type 'int' doesn't allow null.
   int floor() {} // Error.
       ^" in null;
 }
-static method E2|get#floor(lowered final core::int #this) → () → core::int
+static extension-member method E2|get#floor(lowered final core::int #this) → () → core::int
   return () → core::int => self::E2|floor(#this);
-static method E3|get#isOdd(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isOdd(lowered final core::int #this) → core::bool
   return throw 42;
-static method E3|get#isEven(lowered final core::int #this) → core::bool
+static extension-member method E3|get#isEven(lowered final core::int #this) → core::bool
   return throw 42;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.strong.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.strong.expect
index a112f26c212..3d29458bdd1 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.strong.expect
@@ -174,32 +174,32 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void {}
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|method(lowered final self::C #this) → void {}
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method A|set#setter(lowered final self::C #this, core::int value) → void {}
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   return 42;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   return 0;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|method(lowered final self::C #this) → void {}
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|method(lowered final self::C #this) → void {}
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method B|set#setter(lowered final self::C #this, core::int value) → void {}
-static method B|set#property(lowered final self::C #this, core::int value) → void {}
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   return 0;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
 static method errors(self::C c) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/ambiguous.dart:28:5: Error: The method 'method' is defined in multiple extensions for 'C' and neither is more specific.
  - 'C' is from 'pkg/front_end/testcases/extensions/ambiguous.dart'.
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.strong.transformed.expect
index a112f26c212..3d29458bdd1 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.strong.transformed.expect
@@ -174,32 +174,32 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void {}
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|method(lowered final self::C #this) → void {}
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method A|set#setter(lowered final self::C #this, core::int value) → void {}
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   return 42;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   return 0;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|method(lowered final self::C #this) → void {}
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|method(lowered final self::C #this) → void {}
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method B|set#setter(lowered final self::C #this, core::int value) → void {}
-static method B|set#property(lowered final self::C #this, core::int value) → void {}
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   return 0;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
 static method errors(self::C c) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/ambiguous.dart:28:5: Error: The method 'method' is defined in multiple extensions for 'C' and neither is more specific.
  - 'C' is from 'pkg/front_end/testcases/extensions/ambiguous.dart'.
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.expect
index a112f26c212..3d29458bdd1 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.expect
@@ -174,32 +174,32 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void {}
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|method(lowered final self::C #this) → void {}
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method A|set#setter(lowered final self::C #this, core::int value) → void {}
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   return 42;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   return 0;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|method(lowered final self::C #this) → void {}
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|method(lowered final self::C #this) → void {}
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method B|set#setter(lowered final self::C #this, core::int value) → void {}
-static method B|set#property(lowered final self::C #this, core::int value) → void {}
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   return 0;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
 static method errors(self::C c) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/ambiguous.dart:28:5: Error: The method 'method' is defined in multiple extensions for 'C' and neither is more specific.
  - 'C' is from 'pkg/front_end/testcases/extensions/ambiguous.dart'.
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.modular.expect
index a112f26c212..3d29458bdd1 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.modular.expect
@@ -174,32 +174,32 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void {}
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|method(lowered final self::C #this) → void {}
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method A|set#setter(lowered final self::C #this, core::int value) → void {}
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   return 42;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   return 0;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|method(lowered final self::C #this) → void {}
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|method(lowered final self::C #this) → void {}
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method B|set#setter(lowered final self::C #this, core::int value) → void {}
-static method B|set#property(lowered final self::C #this, core::int value) → void {}
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   return 0;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
 static method errors(self::C c) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/ambiguous.dart:28:5: Error: The method 'method' is defined in multiple extensions for 'C' and neither is more specific.
  - 'C' is from 'pkg/front_end/testcases/extensions/ambiguous.dart'.
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.outline.expect
index 7cd8dc17d74..d2441021d72 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.outline.expect
@@ -26,37 +26,37 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void
+static extension-member method A|method(lowered final self::C #this) → void
   ;
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   ;
-static method A|set#setter(lowered final self::C #this, core::int value) → void
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void
   ;
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   ;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   ;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   ;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   ;
-static method B|method(lowered final self::C #this) → void
+static extension-member method B|method(lowered final self::C #this) → void
   ;
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   ;
-static method B|set#setter(lowered final self::C #this, core::int value) → void
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void
   ;
-static method B|set#property(lowered final self::C #this, core::int value) → void
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void
   ;
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   ;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   ;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void
   ;
 static method errors(self::C c) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.transformed.expect
index a112f26c212..3d29458bdd1 100644
--- a/pkg/front_end/testcases/extensions/ambiguous.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/ambiguous.dart.weak.transformed.expect
@@ -174,32 +174,32 @@ extension B on self::C {
   set setter = self::B|set#setter;
   set property = self::B|set#property;
 }
-static method A|method(lowered final self::C #this) → void {}
-static method A|get#method(lowered final self::C #this) → () → void
+static extension-member method A|method(lowered final self::C #this) → void {}
+static extension-member method A|get#method(lowered final self::C #this) → () → void
   return () → void => self::A|method(#this);
-static method A|get#getter(lowered final self::C #this) → core::int
+static extension-member method A|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method A|set#setter(lowered final self::C #this, core::int value) → void {}
-static method A|get#property(lowered final self::C #this) → core::int
+static extension-member method A|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method A|get#property(lowered final self::C #this) → core::int
   return 42;
-static method A|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method A|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method A|unary-(lowered final self::C #this) → core::int
+static extension-member method A|unary-(lowered final self::C #this) → core::int
   return 0;
-static method A|[](lowered final self::C #this, core::int i) → core::int
+static extension-member method A|[](lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|method(lowered final self::C #this) → void {}
-static method B|get#method(lowered final self::C #this) → () → void
+static extension-member method B|method(lowered final self::C #this) → void {}
+static extension-member method B|get#method(lowered final self::C #this) → () → void
   return () → void => self::B|method(#this);
-static method B|get#getter(lowered final self::C #this) → core::int
+static extension-member method B|get#getter(lowered final self::C #this) → core::int
   return 42;
-static method B|set#setter(lowered final self::C #this, core::int value) → void {}
-static method B|set#property(lowered final self::C #this, core::int value) → void {}
-static method B|+(lowered final self::C #this, core::int i) → core::int
+static extension-member method B|set#setter(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|set#property(lowered final self::C #this, core::int value) → void {}
+static extension-member method B|+(lowered final self::C #this, core::int i) → core::int
   return i;
-static method B|unary-(lowered final self::C #this) → core::int
+static extension-member method B|unary-(lowered final self::C #this) → core::int
   return 0;
-static method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
+static extension-member method B|[]=(lowered final self::C #this, core::int i, core::int j) → void {}
 static method errors(self::C c) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/ambiguous.dart:28:5: Error: The method 'method' is defined in multiple extensions for 'C' and neither is more specific.
  - 'C' is from 'pkg/front_end/testcases/extensions/ambiguous.dart'.
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.strong.expect b/pkg/front_end/testcases/extensions/annotations.dart.strong.expect
index 5566eb21d4e..dcd4fdf7da5 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.strong.expect
@@ -17,11 +17,11 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @#C3
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @#C3
-static method Extension|extensionStaticMethod() → dynamic {}
+static extension-member method Extension|extensionStaticMethod() → dynamic {}
 @#C3
 static method topLevelMethod() → dynamic {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/annotations.dart.strong.transformed.expect
index 5566eb21d4e..dcd4fdf7da5 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.strong.transformed.expect
@@ -17,11 +17,11 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @#C3
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @#C3
-static method Extension|extensionStaticMethod() → dynamic {}
+static extension-member method Extension|extensionStaticMethod() → dynamic {}
 @#C3
 static method topLevelMethod() → dynamic {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.weak.expect b/pkg/front_end/testcases/extensions/annotations.dart.weak.expect
index 5566eb21d4e..dcd4fdf7da5 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.weak.expect
@@ -17,11 +17,11 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @#C3
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @#C3
-static method Extension|extensionStaticMethod() → dynamic {}
+static extension-member method Extension|extensionStaticMethod() → dynamic {}
 @#C3
 static method topLevelMethod() → dynamic {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/annotations.dart.weak.modular.expect
index 5566eb21d4e..dcd4fdf7da5 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.weak.modular.expect
@@ -17,11 +17,11 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @#C3
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @#C3
-static method Extension|extensionStaticMethod() → dynamic {}
+static extension-member method Extension|extensionStaticMethod() → dynamic {}
 @#C3
 static method topLevelMethod() → dynamic {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/annotations.dart.weak.outline.expect
index 89deb85d952..4eec0297d11 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.weak.outline.expect
@@ -18,12 +18,12 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @core::pragma::_("dart2js:noInline")
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @core::pragma::_("dart2js:noInline")
-static method Extension|extensionStaticMethod() → dynamic
+static extension-member method Extension|extensionStaticMethod() → dynamic
   ;
 @core::pragma::_("dart2js:noInline")
 static method topLevelMethod() → dynamic
diff --git a/pkg/front_end/testcases/extensions/annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/annotations.dart.weak.transformed.expect
index 5566eb21d4e..dcd4fdf7da5 100644
--- a/pkg/front_end/testcases/extensions/annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/annotations.dart.weak.transformed.expect
@@ -17,11 +17,11 @@ extension Extension on self::Class {
   static method extensionStaticMethod = self::Extension|extensionStaticMethod;
 }
 @#C3
-static method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethod(#this);
 @#C3
-static method Extension|extensionStaticMethod() → dynamic {}
+static extension-member method Extension|extensionStaticMethod() → dynamic {}
 @#C3
 static method topLevelMethod() → dynamic {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.expect
index f4c7d19a0ea..02de024c883 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.expect
@@ -17,10 +17,10 @@ static const field core::int E|constField1 = #C3;
 @#C3
 static const field core::int E|constField2 = #C2;
 @#C1
-static method E|staticMethod() → void {}
+static extension-member method E|staticMethod() → void {}
 @#C1
-static method E|instanceMethod(lowered final core::int #this) → void {}
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.transformed.expect
index f4c7d19a0ea..02de024c883 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.strong.transformed.expect
@@ -17,10 +17,10 @@ static const field core::int E|constField1 = #C3;
 @#C3
 static const field core::int E|constField2 = #C2;
 @#C1
-static method E|staticMethod() → void {}
+static extension-member method E|staticMethod() → void {}
 @#C1
-static method E|instanceMethod(lowered final core::int #this) → void {}
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.expect
index f4c7d19a0ea..02de024c883 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.expect
@@ -17,10 +17,10 @@ static const field core::int E|constField1 = #C3;
 @#C3
 static const field core::int E|constField2 = #C2;
 @#C1
-static method E|staticMethod() → void {}
+static extension-member method E|staticMethod() → void {}
 @#C1
-static method E|instanceMethod(lowered final core::int #this) → void {}
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.modular.expect
index f4c7d19a0ea..02de024c883 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.modular.expect
@@ -17,10 +17,10 @@ static const field core::int E|constField1 = #C3;
 @#C3
 static const field core::int E|constField2 = #C2;
 @#C1
-static method E|staticMethod() → void {}
+static extension-member method E|staticMethod() → void {}
 @#C1
-static method E|instanceMethod(lowered final core::int #this) → void {}
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.outline.expect
index c93da95786e..75d5c2922ab 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.outline.expect
@@ -17,12 +17,12 @@ static const field core::int E|constField1 = 2;
 @self::E|constField1
 static const field core::int E|constField2 = 3;
 @self::E|constField
-static method E|staticMethod() → void
+static extension-member method E|staticMethod() → void
   ;
 @self::E|constField
-static method E|instanceMethod(lowered final core::int #this) → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void
   ;
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.transformed.expect
index f4c7d19a0ea..02de024c883 100644
--- a/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/annotations_scope.dart.weak.transformed.expect
@@ -17,10 +17,10 @@ static const field core::int E|constField1 = #C3;
 @#C3
 static const field core::int E|constField2 = #C2;
 @#C1
-static method E|staticMethod() → void {}
+static extension-member method E|staticMethod() → void {}
 @#C1
-static method E|instanceMethod(lowered final core::int #this) → void {}
-static method E|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method E|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method E|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self::E|instanceMethod(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.strong.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.strong.expect
index 92c8cd319da..6cd6c580051 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.strong.expect
@@ -10,14 +10,14 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic {
   self::Extension|syncStarMethod(0);
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.strong.transformed.expect
index 92c8cd319da..6cd6c580051 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.strong.transformed.expect
@@ -10,14 +10,14 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic {
   self::Extension|syncStarMethod(0);
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.expect
index 92c8cd319da..6cd6c580051 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.expect
@@ -10,14 +10,14 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic {
   self::Extension|syncStarMethod(0);
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.modular.expect
index 92c8cd319da..6cd6c580051 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.modular.expect
@@ -10,14 +10,14 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic {
   self::Extension|syncStarMethod(0);
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.outline.expect
index a1ec5e2510b..2764c282769 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.outline.expect
@@ -10,17 +10,17 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* 
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* 
   ;
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async 
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async 
   ;
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* 
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* 
   ;
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.transformed.expect
index 92c8cd319da..6cd6c580051 100644
--- a/pkg/front_end/testcases/extensions/async_extensions.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/async_extensions.dart.weak.transformed.expect
@@ -10,14 +10,14 @@ extension Extension on core::int {
   method asyncStarMethod = self::Extension|asyncStarMethod;
   tearoff asyncStarMethod = self::Extension|get#asyncStarMethod;
 }
-static method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
-static method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|syncStarMethod(lowered final core::int #this) → dynamic sync* {}
+static extension-member method Extension|get#syncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|syncStarMethod(#this);
-static method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
-static method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncMethod(lowered final core::int #this) → dynamic async /* futureValueType= dynamic */ {}
+static extension-member method Extension|get#asyncMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncMethod(#this);
-static method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
-static method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
+static extension-member method Extension|asyncStarMethod(lowered final core::int #this) → dynamic async* {}
+static extension-member method Extension|get#asyncStarMethod(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension|asyncStarMethod(#this);
 static method main() → dynamic {
   self::Extension|syncStarMethod(0);
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.strong.expect b/pkg/front_end/testcases/extensions/bounds.dart.strong.expect
index d17546f4c3c..ae18fb52aaa 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.strong.expect
@@ -42,52 +42,52 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/bounds.dart.strong.transformed.expect
index d17546f4c3c..ae18fb52aaa 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.strong.transformed.expect
@@ -42,52 +42,52 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.weak.expect b/pkg/front_end/testcases/extensions/bounds.dart.weak.expect
index d17546f4c3c..ae18fb52aaa 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.weak.expect
@@ -42,52 +42,52 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/bounds.dart.weak.modular.expect
index d17546f4c3c..ae18fb52aaa 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.weak.modular.expect
@@ -42,52 +42,52 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/bounds.dart.weak.outline.expect
index 76c1701d193..5b38b840c58 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.weak.outline.expect
@@ -42,69 +42,69 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic
   ;
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic
   ;
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic
   ;
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic
   ;
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic
   ;
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic
   ;
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic
   ;
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic
   ;
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic
   ;
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic
   ;
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic
   ;
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic
   ;
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic
   ;
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic
   ;
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic
   ;
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic
   ;
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/bounds.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/bounds.dart.weak.transformed.expect
index d17546f4c3c..ae18fb52aaa 100644
--- a/pkg/front_end/testcases/extensions/bounds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/bounds.dart.weak.transformed.expect
@@ -42,52 +42,52 @@ extension Extension4<T extends core::Object? = dynamic> on T% {
   method method4 = self::Extension4|method4;
   tearoff method4 = self::Extension4|get#method4;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.strong.expect b/pkg/front_end/testcases/extensions/call_collision.dart.strong.expect
index 4c7722dd4ba..ffbff265a8d 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.strong.expect
@@ -41,9 +41,9 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
-static method _extension#1|call(lowered final self::Class? #this) → void {}
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void {}
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic {
   f1();
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/call_collision.dart.strong.transformed.expect
index 4c7722dd4ba..ffbff265a8d 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.strong.transformed.expect
@@ -41,9 +41,9 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
-static method _extension#1|call(lowered final self::Class? #this) → void {}
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void {}
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic {
   f1();
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.weak.expect b/pkg/front_end/testcases/extensions/call_collision.dart.weak.expect
index 4c7722dd4ba..ffbff265a8d 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.weak.expect
@@ -41,9 +41,9 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
-static method _extension#1|call(lowered final self::Class? #this) → void {}
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void {}
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic {
   f1();
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/call_collision.dart.weak.modular.expect
index 4c7722dd4ba..ffbff265a8d 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.weak.modular.expect
@@ -41,9 +41,9 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
-static method _extension#1|call(lowered final self::Class? #this) → void {}
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void {}
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic {
   f1();
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/call_collision.dart.weak.outline.expect
index 929d5e4a647..389c49b4c39 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.weak.outline.expect
@@ -15,11 +15,11 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void
   ;
-static method _extension#1|call(lowered final self::Class? #this) → void
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void
   ;
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/call_collision.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/call_collision.dart.weak.transformed.expect
index 4c7722dd4ba..ffbff265a8d 100644
--- a/pkg/front_end/testcases/extensions/call_collision.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/call_collision.dart.weak.transformed.expect
@@ -41,9 +41,9 @@ extension /* unnamed */ _extension#1 on self::Class? {
   method call = self::_extension#1|call;
   tearoff call = self::_extension#1|get#call;
 }
-static method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
-static method _extension#1|call(lowered final self::Class? #this) → void {}
-static method _extension#1|get#call(lowered final self::Class? #this) → () → void
+static extension-member method _extension#0|set#call(lowered final dynamic #this, dynamic _) → void {}
+static extension-member method _extension#1|call(lowered final self::Class? #this) → void {}
+static extension-member method _extension#1|get#call(lowered final self::Class? #this) → () → void
   return () → void => self::_extension#1|call(#this);
 static method method(core::Function f1, () → void f2, self::Class c1, self::Class? c2) → dynamic {
   f1();
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.strong.expect b/pkg/front_end/testcases/extensions/call_methods.dart.strong.expect
index 88964c08bd3..b93b7f0ffa5 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.strong.expect
@@ -126,11 +126,11 @@ static field invalid-type topLevel6 = invalid-expression "pkg/front_end/testcase
 Try changing 'call' to a method or explicitly invoke 'call'.
 var topLevel6 = a(2, \"3\");
                  ^";
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   return "My name is int";
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   return "My name is num";
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   return () → core::String => "My name is String";
 static method main() → dynamic {
   self::_extension#2|get#call("")(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/call_methods.dart.strong.transformed.expect
index 88964c08bd3..b93b7f0ffa5 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.strong.transformed.expect
@@ -126,11 +126,11 @@ static field invalid-type topLevel6 = invalid-expression "pkg/front_end/testcase
 Try changing 'call' to a method or explicitly invoke 'call'.
 var topLevel6 = a(2, \"3\");
                  ^";
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   return "My name is int";
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   return "My name is num";
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   return () → core::String => "My name is String";
 static method main() → dynamic {
   self::_extension#2|get#call("")(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.weak.expect b/pkg/front_end/testcases/extensions/call_methods.dart.weak.expect
index 88964c08bd3..b93b7f0ffa5 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.weak.expect
@@ -126,11 +126,11 @@ static field invalid-type topLevel6 = invalid-expression "pkg/front_end/testcase
 Try changing 'call' to a method or explicitly invoke 'call'.
 var topLevel6 = a(2, \"3\");
                  ^";
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   return "My name is int";
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   return "My name is num";
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   return () → core::String => "My name is String";
 static method main() → dynamic {
   self::_extension#2|get#call("")(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/call_methods.dart.weak.modular.expect
index 88964c08bd3..b93b7f0ffa5 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.weak.modular.expect
@@ -126,11 +126,11 @@ static field invalid-type topLevel6 = invalid-expression "pkg/front_end/testcase
 Try changing 'call' to a method or explicitly invoke 'call'.
 var topLevel6 = a(2, \"3\");
                  ^";
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   return "My name is int";
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   return "My name is num";
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   return () → core::String => "My name is String";
 static method main() → dynamic {
   self::_extension#2|get#call("")(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/call_methods.dart.weak.outline.expect
index 97b889ef1ef..a6d35a27dea 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.weak.outline.expect
@@ -66,11 +66,11 @@ static field self::A a;
 static field invalid-type topLevel5;
 static field self::B b;
 static field invalid-type topLevel6;
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   ;
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   ;
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/call_methods.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/call_methods.dart.weak.transformed.expect
index 88964c08bd3..b93b7f0ffa5 100644
--- a/pkg/front_end/testcases/extensions/call_methods.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/call_methods.dart.weak.transformed.expect
@@ -126,11 +126,11 @@ static field invalid-type topLevel6 = invalid-expression "pkg/front_end/testcase
 Try changing 'call' to a method or explicitly invoke 'call'.
 var topLevel6 = a(2, \"3\");
                  ^";
-static method _extension#0|get#call(lowered final core::int #this) → core::String
+static extension-member method _extension#0|get#call(lowered final core::int #this) → core::String
   return "My name is int";
-static method _extension#1|get#call(lowered final core::num #this) → core::String
+static extension-member method _extension#1|get#call(lowered final core::num #this) → core::String
   return "My name is num";
-static method _extension#2|get#call(lowered final core::String #this) → () → core::String
+static extension-member method _extension#2|get#call(lowered final core::String #this) → () → core::String
   return () → core::String => "My name is String";
 static method main() → dynamic {
   self::_extension#2|get#call("")(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.strong.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.strong.expect
index 7a4f90c15d7..5bb01cab660 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.strong.expect
@@ -1031,11 +1031,11 @@ static final field dynamic field29 = self::Extension|genericMethod<self::B, self
  - 'B' is from 'pkg/front_end/testcases/extensions/check_bounds.dart'.
 final field29 = Extension<B>(classB).genericMethod<B>(a);
                                                       ^" in self::a as{TypeError} self::B);
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic {}
 static method test(self::A a) → dynamic {
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.strong.transformed.expect
index 7a4f90c15d7..5bb01cab660 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.strong.transformed.expect
@@ -1031,11 +1031,11 @@ static final field dynamic field29 = self::Extension|genericMethod<self::B, self
  - 'B' is from 'pkg/front_end/testcases/extensions/check_bounds.dart'.
 final field29 = Extension<B>(classB).genericMethod<B>(a);
                                                       ^" in self::a as{TypeError} self::B);
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic {}
 static method test(self::A a) → dynamic {
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.expect
index 7a4f90c15d7..5bb01cab660 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.expect
@@ -1031,11 +1031,11 @@ static final field dynamic field29 = self::Extension|genericMethod<self::B, self
  - 'B' is from 'pkg/front_end/testcases/extensions/check_bounds.dart'.
 final field29 = Extension<B>(classB).genericMethod<B>(a);
                                                       ^" in self::a as{TypeError} self::B);
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic {}
 static method test(self::A a) → dynamic {
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.modular.expect
index 7a4f90c15d7..5bb01cab660 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.modular.expect
@@ -1031,11 +1031,11 @@ static final field dynamic field29 = self::Extension|genericMethod<self::B, self
  - 'B' is from 'pkg/front_end/testcases/extensions/check_bounds.dart'.
 final field29 = Extension<B>(classB).genericMethod<B>(a);
                                                       ^" in self::a as{TypeError} self::B);
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic {}
 static method test(self::A a) → dynamic {
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.outline.expect
index 3737c229404..d125e846b70 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.outline.expect
@@ -372,13 +372,13 @@ static final field dynamic field26;
 static final field dynamic field27;
 static final field dynamic field28;
 static final field dynamic field29;
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic
   ;
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic
   ;
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.transformed.expect
index 7a4f90c15d7..5bb01cab660 100644
--- a/pkg/front_end/testcases/extensions/check_bounds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/check_bounds.dart.weak.transformed.expect
@@ -1031,11 +1031,11 @@ static final field dynamic field29 = self::Extension|genericMethod<self::B, self
  - 'B' is from 'pkg/front_end/testcases/extensions/check_bounds.dart'.
 final field29 = Extension<B>(classB).genericMethod<B>(a);
                                                       ^" in self::a as{TypeError} self::B);
-static method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
-static method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
+static extension-member method Extension|method<T extends self::B>(lowered final self::Class<self::Extension|method::T> #this) → dynamic {}
+static extension-member method Extension|get#method<T extends self::B>(lowered final self::Class<self::Extension|get#method::T> #this) → () → dynamic
   return () → dynamic => self::Extension|method<self::Extension|get#method::T>(#this);
-static method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
-static method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
+static extension-member method Extension|genericMethod<T extends self::B, S extends self::B>(lowered final self::Class<self::Extension|genericMethod::T> #this, self::Extension|genericMethod::S s) → dynamic {}
+static extension-member method Extension|get#genericMethod<T extends self::B>(lowered final self::Class<self::Extension|get#genericMethod::T> #this) → <S extends self::B>(S) → dynamic
   return <S extends self::B>(S s) → dynamic => self::Extension|genericMethod<self::Extension|get#genericMethod::T, S>(#this, s);
 static method main() → dynamic {}
 static method test(self::A a) → dynamic {
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.strong.expect b/pkg/front_end/testcases/extensions/compounds.dart.strong.expect
index f617682132e..544acf22fd3 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.strong.expect
@@ -42,7 +42,7 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::+}(other{core::int}){(core::num) → core::int});
   }
@@ -54,7 +54,7 @@ static method NumberExtension|+(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::-}(other{core::int}){(core::num) → core::int});
   }
@@ -66,12 +66,12 @@ static method NumberExtension|-(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   return #this.{self::Class::field}{self::Number};
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
   #this.{self::Class::field} = value;
 }
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
   self::Number n0 = new self::Number::•(0);
   self::Number n1 = new self::Number::•(1);
   self::Number n2 = new self::Number::•(2);
@@ -106,14 +106,14 @@ static method ClassExtension|testImplicitProperties(lowered final self::Class #t
   self::ClassExtension|set#property(#this, self::NumberExtension|-(self::ClassExtension|get#property(#this), 1));
   self::expect(n0, self::ClassExtension|get#property(#this));
 }
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   return #this.{self::IntClass::field}{core::int};
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
   #this.{self::IntClass::field} = value;
 }
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
   core::int n0 = 0;
   core::int n1 = 1;
   core::int n2 = 2;
@@ -148,7 +148,7 @@ static method IntClassExtension|testImplicitProperties(lowered final self::IntCl
   self::IntClassExtension|set#property(#this, self::IntClassExtension|get#property(#this).{core::num::-}(1){(core::num) → core::int});
   self::expect(n0, self::IntClassExtension|get#property(#this));
 }
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic {
   self::testLocals();
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/compounds.dart.strong.transformed.expect
index f617682132e..544acf22fd3 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.strong.transformed.expect
@@ -42,7 +42,7 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::+}(other{core::int}){(core::num) → core::int});
   }
@@ -54,7 +54,7 @@ static method NumberExtension|+(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::-}(other{core::int}){(core::num) → core::int});
   }
@@ -66,12 +66,12 @@ static method NumberExtension|-(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   return #this.{self::Class::field}{self::Number};
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
   #this.{self::Class::field} = value;
 }
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
   self::Number n0 = new self::Number::•(0);
   self::Number n1 = new self::Number::•(1);
   self::Number n2 = new self::Number::•(2);
@@ -106,14 +106,14 @@ static method ClassExtension|testImplicitProperties(lowered final self::Class #t
   self::ClassExtension|set#property(#this, self::NumberExtension|-(self::ClassExtension|get#property(#this), 1));
   self::expect(n0, self::ClassExtension|get#property(#this));
 }
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   return #this.{self::IntClass::field}{core::int};
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
   #this.{self::IntClass::field} = value;
 }
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
   core::int n0 = 0;
   core::int n1 = 1;
   core::int n2 = 2;
@@ -148,7 +148,7 @@ static method IntClassExtension|testImplicitProperties(lowered final self::IntCl
   self::IntClassExtension|set#property(#this, self::IntClassExtension|get#property(#this).{core::num::-}(1){(core::num) → core::int});
   self::expect(n0, self::IntClassExtension|get#property(#this));
 }
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic {
   self::testLocals();
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.weak.expect b/pkg/front_end/testcases/extensions/compounds.dart.weak.expect
index f617682132e..544acf22fd3 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.weak.expect
@@ -42,7 +42,7 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::+}(other{core::int}){(core::num) → core::int});
   }
@@ -54,7 +54,7 @@ static method NumberExtension|+(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::-}(other{core::int}){(core::num) → core::int});
   }
@@ -66,12 +66,12 @@ static method NumberExtension|-(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   return #this.{self::Class::field}{self::Number};
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
   #this.{self::Class::field} = value;
 }
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
   self::Number n0 = new self::Number::•(0);
   self::Number n1 = new self::Number::•(1);
   self::Number n2 = new self::Number::•(2);
@@ -106,14 +106,14 @@ static method ClassExtension|testImplicitProperties(lowered final self::Class #t
   self::ClassExtension|set#property(#this, self::NumberExtension|-(self::ClassExtension|get#property(#this), 1));
   self::expect(n0, self::ClassExtension|get#property(#this));
 }
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   return #this.{self::IntClass::field}{core::int};
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
   #this.{self::IntClass::field} = value;
 }
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
   core::int n0 = 0;
   core::int n1 = 1;
   core::int n2 = 2;
@@ -148,7 +148,7 @@ static method IntClassExtension|testImplicitProperties(lowered final self::IntCl
   self::IntClassExtension|set#property(#this, self::IntClassExtension|get#property(#this).{core::num::-}(1){(core::num) → core::int});
   self::expect(n0, self::IntClassExtension|get#property(#this));
 }
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic {
   self::testLocals();
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/compounds.dart.weak.modular.expect
index f617682132e..544acf22fd3 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.weak.modular.expect
@@ -42,7 +42,7 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::+}(other{core::int}){(core::num) → core::int});
   }
@@ -54,7 +54,7 @@ static method NumberExtension|+(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::-}(other{core::int}){(core::num) → core::int});
   }
@@ -66,12 +66,12 @@ static method NumberExtension|-(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   return #this.{self::Class::field}{self::Number};
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
   #this.{self::Class::field} = value;
 }
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
   self::Number n0 = new self::Number::•(0);
   self::Number n1 = new self::Number::•(1);
   self::Number n2 = new self::Number::•(2);
@@ -106,14 +106,14 @@ static method ClassExtension|testImplicitProperties(lowered final self::Class #t
   self::ClassExtension|set#property(#this, self::NumberExtension|-(self::ClassExtension|get#property(#this), 1));
   self::expect(n0, self::ClassExtension|get#property(#this));
 }
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   return #this.{self::IntClass::field}{core::int};
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
   #this.{self::IntClass::field} = value;
 }
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
   core::int n0 = 0;
   core::int n1 = 1;
   core::int n2 = 2;
@@ -148,7 +148,7 @@ static method IntClassExtension|testImplicitProperties(lowered final self::IntCl
   self::IntClassExtension|set#property(#this, self::IntClassExtension|get#property(#this).{core::num::-}(1){(core::num) → core::int});
   self::expect(n0, self::IntClassExtension|get#property(#this));
 }
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic {
   self::testLocals();
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/compounds.dart.weak.outline.expect
index 6518113288d..4e044c0bb14 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.weak.outline.expect
@@ -39,25 +39,25 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number
   ;
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number
   ;
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   ;
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void
   ;
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic
   ;
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   ;
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void
   ;
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic
   ;
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/compounds.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/compounds.dart.weak.transformed.expect
index f617682132e..544acf22fd3 100644
--- a/pkg/front_end/testcases/extensions/compounds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/compounds.dart.weak.transformed.expect
@@ -42,7 +42,7 @@ extension IntClassExtension on self::IntClass {
   tearoff testImplicitProperties = self::IntClassExtension|get#testImplicitProperties;
   set property = self::IntClassExtension|set#property;
 }
-static method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|+(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::+}(other{core::int}){(core::num) → core::int});
   }
@@ -54,7 +54,7 @@ static method NumberExtension|+(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
+static extension-member method NumberExtension|-(lowered final self::Number #this, core::Object other) → self::Number {
   if(other is core::int) {
     return new self::Number::•(#this.{self::Number::value}{core::int}.{core::num::-}(other{core::int}){(core::num) → core::int});
   }
@@ -66,12 +66,12 @@ static method NumberExtension|-(lowered final self::Number #this, core::Object o
       throw new core::ArgumentError::•("${other}");
     }
 }
-static method ClassExtension|get#property(lowered final self::Class #this) → self::Number
+static extension-member method ClassExtension|get#property(lowered final self::Class #this) → self::Number
   return #this.{self::Class::field}{self::Number};
-static method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
+static extension-member method ClassExtension|set#property(lowered final self::Class #this, self::Number value) → void {
   #this.{self::Class::field} = value;
 }
-static method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
+static extension-member method ClassExtension|testImplicitProperties(lowered final self::Class #this) → dynamic {
   self::Number n0 = new self::Number::•(0);
   self::Number n1 = new self::Number::•(1);
   self::Number n2 = new self::Number::•(2);
@@ -106,14 +106,14 @@ static method ClassExtension|testImplicitProperties(lowered final self::Class #t
   self::ClassExtension|set#property(#this, self::NumberExtension|-(self::ClassExtension|get#property(#this), 1));
   self::expect(n0, self::ClassExtension|get#property(#this));
 }
-static method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
+static extension-member method ClassExtension|get#testImplicitProperties(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::ClassExtension|testImplicitProperties(#this);
-static method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
+static extension-member method IntClassExtension|get#property(lowered final self::IntClass #this) → core::int
   return #this.{self::IntClass::field}{core::int};
-static method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
+static extension-member method IntClassExtension|set#property(lowered final self::IntClass #this, core::int value) → void {
   #this.{self::IntClass::field} = value;
 }
-static method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
+static extension-member method IntClassExtension|testImplicitProperties(lowered final self::IntClass #this) → dynamic {
   core::int n0 = 0;
   core::int n1 = 1;
   core::int n2 = 2;
@@ -148,7 +148,7 @@ static method IntClassExtension|testImplicitProperties(lowered final self::IntCl
   self::IntClassExtension|set#property(#this, self::IntClassExtension|get#property(#this).{core::num::-}(1){(core::num) → core::int});
   self::expect(n0, self::IntClassExtension|get#property(#this));
 }
-static method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
+static extension-member method IntClassExtension|get#testImplicitProperties(lowered final self::IntClass #this) → () → dynamic
   return () → dynamic => self::IntClassExtension|testImplicitProperties(#this);
 static method main() → dynamic {
   self::testLocals();
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.expect
index cc1ab57ff03..306f95b1797 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.expect
@@ -48,16 +48,16 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   return 42;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   return 0;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   return false;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   return "Foo";
 static method main() → dynamic {
   core::int value;
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.transformed.expect
index 278e4bd394b..97698fd79a0 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.strong.transformed.expect
@@ -48,16 +48,16 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   return 42;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   return 0;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   return false;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   return "Foo";
 static method main() → dynamic {
   core::int value;
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.expect
index cc1ab57ff03..306f95b1797 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.expect
@@ -48,16 +48,16 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   return 42;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   return 0;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   return false;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   return "Foo";
 static method main() → dynamic {
   core::int value;
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.modular.expect
index cc1ab57ff03..306f95b1797 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.modular.expect
@@ -48,16 +48,16 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   return 42;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   return 0;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   return false;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   return "Foo";
 static method main() → dynamic {
   core::int value;
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.outline.expect
index 31198df5b9b..b7c17563489 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.outline.expect
@@ -33,17 +33,17 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   ;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void
   ;
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   ;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   ;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.transformed.expect
index 278e4bd394b..97698fd79a0 100644
--- a/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/conflict_with_object.dart.weak.transformed.expect
@@ -48,16 +48,16 @@ extension Extension on core::String {
   static method toString = self::Extension|toString;
   set hashCode = self::Extension|set#hashCode;
 }
-static method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
+static extension-member method Extension|get#noSuchMethod(lowered final core::String #this) → core::int
   return 42;
-static method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
-static method Extension|runtimeType(lowered final core::String #this) → core::int
+static extension-member method Extension|set#hashCode(lowered final core::String #this, core::int value) → void {}
+static extension-member method Extension|runtimeType(lowered final core::String #this) → core::int
   return 0;
-static method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#runtimeType(lowered final core::String #this) → () → core::int
   return () → core::int => self::Extension|runtimeType(#this);
-static method Extension|==(lowered final core::String #this, dynamic other) → dynamic
+static extension-member method Extension|==(lowered final core::String #this, dynamic other) → dynamic
   return false;
-static method Extension|toString() → core::String
+static extension-member method Extension|toString() → core::String
   return "Foo";
 static method main() → dynamic {
   core::int value;
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.strong.expect b/pkg/front_end/testcases/extensions/conflicts.dart.strong.expect
index 43dc5b071c9..da1498daae9 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.strong.expect
@@ -45,16 +45,16 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   return 1;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   return 1;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic {
   self::Class1 c1 = new self::Class1::•();
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/conflicts.dart.strong.transformed.expect
index 43dc5b071c9..da1498daae9 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.strong.transformed.expect
@@ -45,16 +45,16 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   return 1;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   return 1;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic {
   self::Class1 c1 = new self::Class1::•();
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.weak.expect b/pkg/front_end/testcases/extensions/conflicts.dart.weak.expect
index 43dc5b071c9..da1498daae9 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.weak.expect
@@ -45,16 +45,16 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   return 1;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   return 1;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic {
   self::Class1 c1 = new self::Class1::•();
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/conflicts.dart.weak.modular.expect
index 43dc5b071c9..da1498daae9 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.weak.modular.expect
@@ -45,16 +45,16 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   return 1;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   return 1;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic {
   self::Class1 c1 = new self::Class1::•();
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/conflicts.dart.weak.outline.expect
index 59e2f40bf82..8adc7c2d6f1 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.weak.outline.expect
@@ -37,17 +37,17 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic
   ;
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   ;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   ;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/conflicts.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/conflicts.dart.weak.transformed.expect
index 43dc5b071c9..da1498daae9 100644
--- a/pkg/front_end/testcases/extensions/conflicts.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/conflicts.dart.weak.transformed.expect
@@ -45,16 +45,16 @@ extension UniqueExtensionName on self::Class1 {
   method duplicateMethodName1 = self::UniqueExtensionName|duplicateMethodName1;
   tearoff duplicateMethodName1 = self::UniqueExtensionName|get#duplicateMethodName1;
 }
-static method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
-static method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|uniqueMethod1(lowered final self::Class1 #this) → dynamic {}
+static extension-member method DuplicateExtensionName|get#uniqueMethod1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|uniqueMethod1(#this);
-static method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
+static extension-member method DuplicateExtensionName|duplicateMethodName2(lowered final self::Class1 #this) → dynamic
   return 1;
-static method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
+static extension-member method DuplicateExtensionName|get#duplicateMethodName2(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::DuplicateExtensionName|duplicateMethodName2(#this);
-static method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
+static extension-member method UniqueExtensionName|duplicateMethodName1(lowered final self::Class1 #this) → dynamic
   return 1;
-static method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
+static extension-member method UniqueExtensionName|get#duplicateMethodName1(lowered final self::Class1 #this) → () → dynamic
   return () → dynamic => self::UniqueExtensionName|duplicateMethodName1(#this);
 static method main() → dynamic {
   self::Class1 c1 = new self::Class1::•();
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.strong.expect b/pkg/front_end/testcases/extensions/default_values.dart.strong.expect
index 45425b38036..e6c3b8267e4 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.strong.expect
@@ -18,23 +18,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
   return a;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C1]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
   return a;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C2]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
   return b;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b = #C3}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
   return c{dynamic}.call();
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c = #C4}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   return 123;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/default_values.dart.strong.transformed.expect
index 45425b38036..e6c3b8267e4 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.strong.transformed.expect
@@ -18,23 +18,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
   return a;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C1]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
   return a;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C2]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
   return b;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b = #C3}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
   return c{dynamic}.call();
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c = #C4}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   return 123;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.weak.expect b/pkg/front_end/testcases/extensions/default_values.dart.weak.expect
index 45425b38036..e6c3b8267e4 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.weak.expect
@@ -18,23 +18,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
   return a;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C1]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
   return a;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C2]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
   return b;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b = #C3}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
   return c{dynamic}.call();
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c = #C4}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   return 123;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/default_values.dart.weak.modular.expect
index 45425b38036..e6c3b8267e4 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.weak.modular.expect
@@ -18,23 +18,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
   return a;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C1]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
   return a;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C2]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
   return b;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b = #C3}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
   return c{dynamic}.call();
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c = #C4}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   return 123;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/default_values.dart.weak.outline.expect
index cc739e26c29..1a3f54a3669 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.weak.outline.expect
@@ -17,23 +17,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a]) → dynamic
   ;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [has-declared-initializer dynamic a]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [has-declared-initializer dynamic a]) → dynamic
   ;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {has-declared-initializer dynamic b}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {has-declared-initializer dynamic b}) → dynamic
   ;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {has-declared-initializer dynamic c}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {has-declared-initializer dynamic c}) → dynamic
   ;
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/default_values.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/default_values.dart.weak.transformed.expect
index 45425b38036..e6c3b8267e4 100644
--- a/pkg/front_end/testcases/extensions/default_values.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/default_values.dart.weak.transformed.expect
@@ -18,23 +18,23 @@ extension Extension on self::Class {
   tearoff method3 = self::Extension|get#method3;
   static method staticMethod = self::Extension|staticMethod;
 }
-static method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
+static extension-member method Extension|method0(lowered final self::Class #this, [dynamic a = #C1]) → dynamic
   return a;
-static method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method0(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C1]) → dynamic => self::Extension|method0(#this, a);
-static method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
+static extension-member method Extension|method1(lowered final self::Class #this, [dynamic a = #C2]) → dynamic
   return a;
-static method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic a = #C2]) → dynamic => self::Extension|method1(#this, a);
-static method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
+static extension-member method Extension|method2(lowered final self::Class #this, {dynamic b = #C3}) → dynamic
   return b;
-static method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ({b: dynamic}) → dynamic
   return ({dynamic b = #C3}) → dynamic => self::Extension|method2(#this, b: b);
-static method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
+static extension-member method Extension|method3(lowered final self::Class #this, {dynamic c = #C4}) → dynamic
   return c{dynamic}.call();
-static method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
+static extension-member method Extension|get#method3(lowered final self::Class #this) → ({c: dynamic}) → dynamic
   return ({dynamic c = #C4}) → dynamic => self::Extension|method3(#this, c: c);
-static method Extension|staticMethod() → dynamic
+static extension-member method Extension|staticMethod() → dynamic
   return 123;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.expect
index 23398bbbe56..af2dc813f0e 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.expect
@@ -45,21 +45,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.transformed.expect
index ea0eafde27b..b50566a40b1 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.strong.transformed.expect
@@ -45,21 +45,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.expect
index 23398bbbe56..af2dc813f0e 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.expect
@@ -45,21 +45,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.modular.expect
index 23398bbbe56..af2dc813f0e 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.modular.expect
@@ -45,21 +45,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.outline.expect
index b66738863cd..c4ec6c1cbea 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.outline.expect
@@ -32,19 +32,19 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField;
 static field core::int topLevelField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   ;
-static set Extension|staticProperty(core::int value) → void
+static extension-member set Extension|staticProperty(core::int value) → void
   ;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   ;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   ;
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => self2::Extension|method(#this);
 static get topLevelProperty() → core::int
   ;
diff --git a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.transformed.expect
index ea0eafde27b..b50566a40b1 100644
--- a/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/deferred_explicit_access.dart.weak.transformed.expect
@@ -45,21 +45,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.expect
index 81ea01c4542..e11824cf040 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.expect
@@ -36,21 +36,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.transformed.expect
index bcf528baade..2230081176a 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.strong.transformed.expect
@@ -36,21 +36,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.expect
index 81ea01c4542..e11824cf040 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.expect
@@ -36,21 +36,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.modular.expect
index 81ea01c4542..e11824cf040 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.modular.expect
@@ -36,21 +36,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.outline.expect
index 0d8e8f8de97..c2998381c65 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.outline.expect
@@ -24,19 +24,19 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField;
 static field core::int topLevelField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   ;
-static set Extension|staticProperty(core::int value) → void
+static extension-member set Extension|staticProperty(core::int value) → void
   ;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   ;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   ;
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => self2::Extension|method(#this);
 static get topLevelProperty() → core::int
   ;
diff --git a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.transformed.expect
index bcf528baade..2230081176a 100644
--- a/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/deferred_import_hidden.dart.weak.transformed.expect
@@ -36,21 +36,21 @@ extension Extension on core::int {
 }
 static field core::int Extension|staticField = 0;
 static field core::int topLevelField = def::Extension|staticField;
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return def::Extension|staticField;
-static set Extension|staticProperty(core::int value) → void {
+static extension-member set Extension|staticProperty(core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return def::Extension|staticField;
-static method Extension|get#property(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|set#property(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#property(lowered final core::int #this, core::int value) → void {
   def::Extension|staticField = value;
 }
-static method Extension|method(lowered final core::int #this) → core::int
+static extension-member method Extension|method(lowered final core::int #this) → core::int
   return #this.{core::num::+}(def::Extension|staticField){(core::num) → core::int};
-static method Extension|get#method(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::int #this) → () → core::int
   return () → core::int => def::Extension|method(#this);
 static get topLevelProperty() → core::int
   return def::Extension|staticField;
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.expect
index d296bbaf69f..dd24704fadb 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.expect
@@ -67,40 +67,40 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic {
   return self::Extension|get#property(#this);
 }
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value = #C1]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value = #C1}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   return self::Extension|get#readGetter(#this);
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterRequired(#this);
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterOptional(#this);
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterNamed(#this);
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   return #this.{self::Class::field}{dynamic};
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|readGetter(#this);
   self::Extension|writeSetterRequired(#this, value);
   self::Extension|writeSetterOptional(#this);
@@ -108,11 +108,11 @@ static method Extension|invocations(lowered final self::Class #this, dynamic val
   self::Extension|writeSetterNamed(#this);
   self::Extension|writeSetterNamed(#this, value: value);
 }
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
   () → dynamic tearOffNoArgs = self::Extension|get#readGetter(#this);
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = self::Extension|get#writeSetterRequired(#this);
@@ -124,7 +124,7 @@ static method Extension|tearOffs(lowered final self::Class #this, dynamic value)
   tearOffNamed(){({value: dynamic}) → dynamic};
   tearOffNamed(value: value){({value: dynamic}) → dynamic};
 }
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|get#tearOffGetterNoArgs(#this){dynamic}.call();
   self::Extension|get#tearOffGetterRequired(#this){dynamic}.call(value);
   self::Extension|get#tearOffGetterOptional(#this){dynamic}.call();
@@ -132,63 +132,63 @@ static method Extension|getterCalls(lowered final self::Class #this, dynamic val
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call();
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call(value: value);
 }
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
   return self::GenericExtension|get#property<self::GenericExtension|readGetter::T%>(#this);
 }
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value = #C1]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value = #C1}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value = #C1]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value = #C1}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return #this.{self::GenericClass::field}{self::GenericExtension|get#property::T?};
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
   #this.{self::GenericClass::field} = value;
 }
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   return self::GenericExtension|get#readGetter<self::GenericExtension|get#tearOffGetterNoArgs::T%>(#this);
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterRequired<self::GenericExtension|get#tearOffGetterRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterOptional<self::GenericExtension|get#tearOffGetterOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterNamed<self::GenericExtension|get#tearOffGetterNamed::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterRequired<self::GenericExtension|get#tearOffGetterGenericRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterOptional<self::GenericExtension|get#tearOffGetterGenericOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterNamed<self::GenericExtension|get#tearOffGetterGenericNamed::T%>(#this);
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
   self::GenericExtension|readGetter<self::GenericExtension|invocations::T%>(#this);
   self::GenericExtension|writeSetterRequired<self::GenericExtension|invocations::T%>(#this, value);
   self::GenericExtension|writeSetterOptional<self::GenericExtension|invocations::T%>(#this);
@@ -211,9 +211,9 @@ static method GenericExtension|invocations<T extends core::Object? = dynamic, S
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::T%>(#this, value: value);
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::S%>(#this, value: value);
 }
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
   () → self::GenericExtension|tearOffs::T? tearOffNoArgs = self::GenericExtension|get#readGetter<self::GenericExtension|tearOffs::T%>(#this);
   tearOffNoArgs(){() → self::GenericExtension|tearOffs::T?};
   (self::GenericExtension|tearOffs::T%) → dynamic tearOffRequired = self::GenericExtension|get#writeSetterRequired<self::GenericExtension|tearOffs::T%>(#this);
@@ -243,9 +243,9 @@ static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S ext
   genericTearOffNamed<self::GenericExtension|tearOffs::T%>(value: value){({value: self::GenericExtension|tearOffs::T?}) → dynamic};
   genericTearOffNamed<self::GenericExtension|tearOffs::S%>(value: value){({value: self::GenericExtension|tearOffs::S?}) → dynamic};
 }
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
   self::GenericExtension|get#tearOffGetterNoArgs<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
   self::GenericExtension|get#tearOffGetterRequired<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call(value);
   self::GenericExtension|get#tearOffGetterOptional<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
@@ -268,7 +268,7 @@ static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::T%>(value: value);
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::S%>(value: value);
 }
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.transformed.expect
index d296bbaf69f..dd24704fadb 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.strong.transformed.expect
@@ -67,40 +67,40 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic {
   return self::Extension|get#property(#this);
 }
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value = #C1]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value = #C1}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   return self::Extension|get#readGetter(#this);
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterRequired(#this);
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterOptional(#this);
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterNamed(#this);
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   return #this.{self::Class::field}{dynamic};
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|readGetter(#this);
   self::Extension|writeSetterRequired(#this, value);
   self::Extension|writeSetterOptional(#this);
@@ -108,11 +108,11 @@ static method Extension|invocations(lowered final self::Class #this, dynamic val
   self::Extension|writeSetterNamed(#this);
   self::Extension|writeSetterNamed(#this, value: value);
 }
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
   () → dynamic tearOffNoArgs = self::Extension|get#readGetter(#this);
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = self::Extension|get#writeSetterRequired(#this);
@@ -124,7 +124,7 @@ static method Extension|tearOffs(lowered final self::Class #this, dynamic value)
   tearOffNamed(){({value: dynamic}) → dynamic};
   tearOffNamed(value: value){({value: dynamic}) → dynamic};
 }
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|get#tearOffGetterNoArgs(#this){dynamic}.call();
   self::Extension|get#tearOffGetterRequired(#this){dynamic}.call(value);
   self::Extension|get#tearOffGetterOptional(#this){dynamic}.call();
@@ -132,63 +132,63 @@ static method Extension|getterCalls(lowered final self::Class #this, dynamic val
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call();
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call(value: value);
 }
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
   return self::GenericExtension|get#property<self::GenericExtension|readGetter::T%>(#this);
 }
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value = #C1]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value = #C1}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value = #C1]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value = #C1}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return #this.{self::GenericClass::field}{self::GenericExtension|get#property::T?};
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
   #this.{self::GenericClass::field} = value;
 }
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   return self::GenericExtension|get#readGetter<self::GenericExtension|get#tearOffGetterNoArgs::T%>(#this);
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterRequired<self::GenericExtension|get#tearOffGetterRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterOptional<self::GenericExtension|get#tearOffGetterOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterNamed<self::GenericExtension|get#tearOffGetterNamed::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterRequired<self::GenericExtension|get#tearOffGetterGenericRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterOptional<self::GenericExtension|get#tearOffGetterGenericOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterNamed<self::GenericExtension|get#tearOffGetterGenericNamed::T%>(#this);
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
   self::GenericExtension|readGetter<self::GenericExtension|invocations::T%>(#this);
   self::GenericExtension|writeSetterRequired<self::GenericExtension|invocations::T%>(#this, value);
   self::GenericExtension|writeSetterOptional<self::GenericExtension|invocations::T%>(#this);
@@ -211,9 +211,9 @@ static method GenericExtension|invocations<T extends core::Object? = dynamic, S
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::T%>(#this, value: value);
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::S%>(#this, value: value);
 }
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
   () → self::GenericExtension|tearOffs::T? tearOffNoArgs = self::GenericExtension|get#readGetter<self::GenericExtension|tearOffs::T%>(#this);
   tearOffNoArgs(){() → self::GenericExtension|tearOffs::T?};
   (self::GenericExtension|tearOffs::T%) → dynamic tearOffRequired = self::GenericExtension|get#writeSetterRequired<self::GenericExtension|tearOffs::T%>(#this);
@@ -243,9 +243,9 @@ static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S ext
   genericTearOffNamed<self::GenericExtension|tearOffs::T%>(value: value){({value: self::GenericExtension|tearOffs::T?}) → dynamic};
   genericTearOffNamed<self::GenericExtension|tearOffs::S%>(value: value){({value: self::GenericExtension|tearOffs::S?}) → dynamic};
 }
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
   self::GenericExtension|get#tearOffGetterNoArgs<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
   self::GenericExtension|get#tearOffGetterRequired<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call(value);
   self::GenericExtension|get#tearOffGetterOptional<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
@@ -268,7 +268,7 @@ static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::T%>(value: value);
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::S%>(value: value);
 }
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.expect
index d296bbaf69f..dd24704fadb 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.expect
@@ -67,40 +67,40 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic {
   return self::Extension|get#property(#this);
 }
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value = #C1]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value = #C1}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   return self::Extension|get#readGetter(#this);
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterRequired(#this);
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterOptional(#this);
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterNamed(#this);
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   return #this.{self::Class::field}{dynamic};
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|readGetter(#this);
   self::Extension|writeSetterRequired(#this, value);
   self::Extension|writeSetterOptional(#this);
@@ -108,11 +108,11 @@ static method Extension|invocations(lowered final self::Class #this, dynamic val
   self::Extension|writeSetterNamed(#this);
   self::Extension|writeSetterNamed(#this, value: value);
 }
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
   () → dynamic tearOffNoArgs = self::Extension|get#readGetter(#this);
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = self::Extension|get#writeSetterRequired(#this);
@@ -124,7 +124,7 @@ static method Extension|tearOffs(lowered final self::Class #this, dynamic value)
   tearOffNamed(){({value: dynamic}) → dynamic};
   tearOffNamed(value: value){({value: dynamic}) → dynamic};
 }
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|get#tearOffGetterNoArgs(#this){dynamic}.call();
   self::Extension|get#tearOffGetterRequired(#this){dynamic}.call(value);
   self::Extension|get#tearOffGetterOptional(#this){dynamic}.call();
@@ -132,63 +132,63 @@ static method Extension|getterCalls(lowered final self::Class #this, dynamic val
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call();
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call(value: value);
 }
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
   return self::GenericExtension|get#property<self::GenericExtension|readGetter::T%>(#this);
 }
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value = #C1]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value = #C1}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value = #C1]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value = #C1}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return #this.{self::GenericClass::field}{self::GenericExtension|get#property::T?};
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
   #this.{self::GenericClass::field} = value;
 }
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   return self::GenericExtension|get#readGetter<self::GenericExtension|get#tearOffGetterNoArgs::T%>(#this);
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterRequired<self::GenericExtension|get#tearOffGetterRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterOptional<self::GenericExtension|get#tearOffGetterOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterNamed<self::GenericExtension|get#tearOffGetterNamed::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterRequired<self::GenericExtension|get#tearOffGetterGenericRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterOptional<self::GenericExtension|get#tearOffGetterGenericOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterNamed<self::GenericExtension|get#tearOffGetterGenericNamed::T%>(#this);
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
   self::GenericExtension|readGetter<self::GenericExtension|invocations::T%>(#this);
   self::GenericExtension|writeSetterRequired<self::GenericExtension|invocations::T%>(#this, value);
   self::GenericExtension|writeSetterOptional<self::GenericExtension|invocations::T%>(#this);
@@ -211,9 +211,9 @@ static method GenericExtension|invocations<T extends core::Object? = dynamic, S
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::T%>(#this, value: value);
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::S%>(#this, value: value);
 }
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
   () → self::GenericExtension|tearOffs::T? tearOffNoArgs = self::GenericExtension|get#readGetter<self::GenericExtension|tearOffs::T%>(#this);
   tearOffNoArgs(){() → self::GenericExtension|tearOffs::T?};
   (self::GenericExtension|tearOffs::T%) → dynamic tearOffRequired = self::GenericExtension|get#writeSetterRequired<self::GenericExtension|tearOffs::T%>(#this);
@@ -243,9 +243,9 @@ static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S ext
   genericTearOffNamed<self::GenericExtension|tearOffs::T%>(value: value){({value: self::GenericExtension|tearOffs::T?}) → dynamic};
   genericTearOffNamed<self::GenericExtension|tearOffs::S%>(value: value){({value: self::GenericExtension|tearOffs::S?}) → dynamic};
 }
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
   self::GenericExtension|get#tearOffGetterNoArgs<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
   self::GenericExtension|get#tearOffGetterRequired<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call(value);
   self::GenericExtension|get#tearOffGetterOptional<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
@@ -268,7 +268,7 @@ static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::T%>(value: value);
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::S%>(value: value);
 }
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.modular.expect
index d296bbaf69f..dd24704fadb 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.modular.expect
@@ -67,40 +67,40 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic {
   return self::Extension|get#property(#this);
 }
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value = #C1]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value = #C1}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   return self::Extension|get#readGetter(#this);
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterRequired(#this);
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterOptional(#this);
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterNamed(#this);
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   return #this.{self::Class::field}{dynamic};
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|readGetter(#this);
   self::Extension|writeSetterRequired(#this, value);
   self::Extension|writeSetterOptional(#this);
@@ -108,11 +108,11 @@ static method Extension|invocations(lowered final self::Class #this, dynamic val
   self::Extension|writeSetterNamed(#this);
   self::Extension|writeSetterNamed(#this, value: value);
 }
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
   () → dynamic tearOffNoArgs = self::Extension|get#readGetter(#this);
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = self::Extension|get#writeSetterRequired(#this);
@@ -124,7 +124,7 @@ static method Extension|tearOffs(lowered final self::Class #this, dynamic value)
   tearOffNamed(){({value: dynamic}) → dynamic};
   tearOffNamed(value: value){({value: dynamic}) → dynamic};
 }
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|get#tearOffGetterNoArgs(#this){dynamic}.call();
   self::Extension|get#tearOffGetterRequired(#this){dynamic}.call(value);
   self::Extension|get#tearOffGetterOptional(#this){dynamic}.call();
@@ -132,63 +132,63 @@ static method Extension|getterCalls(lowered final self::Class #this, dynamic val
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call();
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call(value: value);
 }
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
   return self::GenericExtension|get#property<self::GenericExtension|readGetter::T%>(#this);
 }
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value = #C1]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value = #C1}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value = #C1]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value = #C1}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return #this.{self::GenericClass::field}{self::GenericExtension|get#property::T?};
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
   #this.{self::GenericClass::field} = value;
 }
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   return self::GenericExtension|get#readGetter<self::GenericExtension|get#tearOffGetterNoArgs::T%>(#this);
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterRequired<self::GenericExtension|get#tearOffGetterRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterOptional<self::GenericExtension|get#tearOffGetterOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterNamed<self::GenericExtension|get#tearOffGetterNamed::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterRequired<self::GenericExtension|get#tearOffGetterGenericRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterOptional<self::GenericExtension|get#tearOffGetterGenericOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterNamed<self::GenericExtension|get#tearOffGetterGenericNamed::T%>(#this);
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
   self::GenericExtension|readGetter<self::GenericExtension|invocations::T%>(#this);
   self::GenericExtension|writeSetterRequired<self::GenericExtension|invocations::T%>(#this, value);
   self::GenericExtension|writeSetterOptional<self::GenericExtension|invocations::T%>(#this);
@@ -211,9 +211,9 @@ static method GenericExtension|invocations<T extends core::Object? = dynamic, S
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::T%>(#this, value: value);
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::S%>(#this, value: value);
 }
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
   () → self::GenericExtension|tearOffs::T? tearOffNoArgs = self::GenericExtension|get#readGetter<self::GenericExtension|tearOffs::T%>(#this);
   tearOffNoArgs(){() → self::GenericExtension|tearOffs::T?};
   (self::GenericExtension|tearOffs::T%) → dynamic tearOffRequired = self::GenericExtension|get#writeSetterRequired<self::GenericExtension|tearOffs::T%>(#this);
@@ -243,9 +243,9 @@ static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S ext
   genericTearOffNamed<self::GenericExtension|tearOffs::T%>(value: value){({value: self::GenericExtension|tearOffs::T?}) → dynamic};
   genericTearOffNamed<self::GenericExtension|tearOffs::S%>(value: value){({value: self::GenericExtension|tearOffs::S?}) → dynamic};
 }
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
   self::GenericExtension|get#tearOffGetterNoArgs<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
   self::GenericExtension|get#tearOffGetterRequired<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call(value);
   self::GenericExtension|get#tearOffGetterOptional<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
@@ -268,7 +268,7 @@ static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::T%>(value: value);
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::S%>(value: value);
 }
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.outline.expect
index f35498398c5..0cc8c40b49c 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.outline.expect
@@ -65,103 +65,103 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic
   ;
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic
   ;
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value]) → dynamic
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value]) → dynamic
   ;
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value}) → dynamic
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value}) → dynamic
   ;
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   ;
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void
   ;
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic
   ;
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic
   ;
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic
   ;
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T?
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T?
   ;
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic
   ;
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value]) → dynamic
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value]) → dynamic
   ;
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value}) → dynamic
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value}) → dynamic
   ;
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic
   ;
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value]) → dynamic
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value]) → dynamic
   ;
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value}) → dynamic
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value}) → dynamic
   ;
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   ;
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void
   ;
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   ;
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   ;
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic
   ;
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic
   ;
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic
   ;
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.transformed.expect
index d296bbaf69f..dd24704fadb 100644
--- a/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/direct_instance_access.dart.weak.transformed.expect
@@ -67,40 +67,40 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   tearoff getterCalls = self::GenericExtension|get#getterCalls;
   set property = self::GenericExtension|set#property;
 }
-static method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#readGetter(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|readGetter(#this);
-static method Extension|readGetter(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|readGetter(lowered final self::Class #this) → dynamic {
   return self::Extension|get#property(#this);
 }
-static method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#writeSetterRequired(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|writeSetterRequired(#this, value);
-static method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional(lowered final self::Class #this, [dynamic value = #C1]) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
+static extension-member method Extension|get#writeSetterOptional(lowered final self::Class #this) → ([dynamic]) → dynamic
   return ([dynamic value = #C1]) → dynamic => self::Extension|writeSetterOptional(#this, value);
-static method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed(lowered final self::Class #this, {dynamic value = #C1}) → dynamic {
   self::Extension|set#property(#this, value);
 }
-static method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
+static extension-member method Extension|get#writeSetterNamed(lowered final self::Class #this) → ({value: dynamic}) → dynamic
   return ({dynamic value = #C1}) → dynamic => self::Extension|writeSetterNamed(#this, value: value);
-static method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNoArgs(lowered final self::Class #this) → dynamic
   return self::Extension|get#readGetter(#this);
-static method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterRequired(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterRequired(#this);
-static method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterOptional(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterOptional(#this);
-static method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#tearOffGetterNamed(lowered final self::Class #this) → dynamic
   return self::Extension|get#writeSetterNamed(#this);
-static method Extension|get#property(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#property(lowered final self::Class #this) → dynamic
   return #this.{self::Class::field}{dynamic};
-static method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, dynamic value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|invocations(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|readGetter(#this);
   self::Extension|writeSetterRequired(#this, value);
   self::Extension|writeSetterOptional(#this);
@@ -108,11 +108,11 @@ static method Extension|invocations(lowered final self::Class #this, dynamic val
   self::Extension|writeSetterNamed(#this);
   self::Extension|writeSetterNamed(#this, value: value);
 }
-static method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#invocations(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|invocations(#this, value);
-static method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#tearOffs(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|tearOffs(#this, value);
-static method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|tearOffs(lowered final self::Class #this, dynamic value) → dynamic {
   () → dynamic tearOffNoArgs = self::Extension|get#readGetter(#this);
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = self::Extension|get#writeSetterRequired(#this);
@@ -124,7 +124,7 @@ static method Extension|tearOffs(lowered final self::Class #this, dynamic value)
   tearOffNamed(){({value: dynamic}) → dynamic};
   tearOffNamed(value: value){({value: dynamic}) → dynamic};
 }
-static method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
+static extension-member method Extension|getterCalls(lowered final self::Class #this, dynamic value) → dynamic {
   self::Extension|get#tearOffGetterNoArgs(#this){dynamic}.call();
   self::Extension|get#tearOffGetterRequired(#this){dynamic}.call(value);
   self::Extension|get#tearOffGetterOptional(#this){dynamic}.call();
@@ -132,63 +132,63 @@ static method Extension|getterCalls(lowered final self::Class #this, dynamic val
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call();
   self::Extension|get#tearOffGetterNamed(#this){dynamic}.call(value: value);
 }
-static method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#getterCalls(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic value) → dynamic => self::Extension|getterCalls(#this, value);
-static method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
+static extension-member method GenericExtension|readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|readGetter::T%> #this) → self::GenericExtension|readGetter::T? {
   return self::GenericExtension|get#property<self::GenericExtension|readGetter::T%>(#this);
 }
-static method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
+static extension-member method GenericExtension|get#readGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#readGetter::T%> #this) → () → self::GenericExtension|get#readGetter::T?
   return () → self::GenericExtension|get#readGetter::T? => self::GenericExtension|readGetter<self::GenericExtension|get#readGetter::T%>(#this);
-static method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
+static extension-member method GenericExtension|writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterRequired::T%> #this, self::GenericExtension|writeSetterRequired::T% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
+static extension-member method GenericExtension|get#writeSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterRequired::T%> #this) → (self::GenericExtension|get#writeSetterRequired::T%) → dynamic
   return (self::GenericExtension|get#writeSetterRequired::T% value) → dynamic => self::GenericExtension|writeSetterRequired<self::GenericExtension|get#writeSetterRequired::T%>(#this, value);
-static method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
+static extension-member method GenericExtension|writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterOptional::T%> #this, [self::GenericExtension|writeSetterOptional::T? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
+static extension-member method GenericExtension|get#writeSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterOptional::T%> #this) → ([self::GenericExtension|get#writeSetterOptional::T?]) → dynamic
   return ([self::GenericExtension|get#writeSetterOptional::T? value = #C1]) → dynamic => self::GenericExtension|writeSetterOptional<self::GenericExtension|get#writeSetterOptional::T%>(#this, value);
-static method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
+static extension-member method GenericExtension|writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|writeSetterNamed::T%> #this, {self::GenericExtension|writeSetterNamed::T? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|writeSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
+static extension-member method GenericExtension|get#writeSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#writeSetterNamed::T%> #this) → ({value: self::GenericExtension|get#writeSetterNamed::T?}) → dynamic
   return ({self::GenericExtension|get#writeSetterNamed::T? value = #C1}) → dynamic => self::GenericExtension|writeSetterNamed<self::GenericExtension|get#writeSetterNamed::T%>(#this, value: value);
-static method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterRequired<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterRequired::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterRequired::T%> #this, self::GenericExtension|genericWriteSetterRequired::S% value) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterRequired::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterRequired::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterRequired::T% = dynamic>(S% value) → dynamic => self::GenericExtension|genericWriteSetterRequired<self::GenericExtension|get#genericWriteSetterRequired::T%, S%>(#this, value);
-static method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterOptional<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterOptional::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterOptional::T%> #this, [self::GenericExtension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterOptional::T%>(#this, value);
 }
-static method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterOptional::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S?]) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterOptional::T% = dynamic>([S? value = #C1]) → dynamic => self::GenericExtension|genericWriteSetterOptional<self::GenericExtension|get#genericWriteSetterOptional::T%, S%>(#this, value);
-static method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
+static extension-member method GenericExtension|get#genericWriteSetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericWriteSetterNamed::T%> #this) → <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({value: S?}) → dynamic
   return <S extends self::GenericExtension|get#genericWriteSetterNamed::T% = dynamic>({S? value = #C1}) → dynamic => self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|get#genericWriteSetterNamed::T%, S%>(#this, value: value);
-static method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method GenericExtension|genericWriteSetterNamed<T extends core::Object? = dynamic, S extends self::GenericExtension|genericWriteSetterNamed::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericWriteSetterNamed::T%> #this, {self::GenericExtension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::GenericExtension|set#property<self::GenericExtension|genericWriteSetterNamed::T%>(#this, value);
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return #this.{self::GenericClass::field}{self::GenericExtension|get#property::T?};
-static method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
+static extension-member method GenericExtension|set#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#property::T%> #this, self::GenericExtension|set#property::T? value) → void {
   #this.{self::GenericClass::field} = value;
 }
-static method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNoArgs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNoArgs::T%> #this) → dynamic
   return self::GenericExtension|get#readGetter<self::GenericExtension|get#tearOffGetterNoArgs::T%>(#this);
-static method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterRequired::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterRequired<self::GenericExtension|get#tearOffGetterRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterOptional::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterOptional<self::GenericExtension|get#tearOffGetterOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterNamed::T%> #this) → dynamic
   return self::GenericExtension|get#writeSetterNamed<self::GenericExtension|get#tearOffGetterNamed::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericRequired<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericRequired::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterRequired<self::GenericExtension|get#tearOffGetterGenericRequired::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericOptional<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericOptional::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterOptional<self::GenericExtension|get#tearOffGetterGenericOptional::T%>(#this);
-static method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
+static extension-member method GenericExtension|get#tearOffGetterGenericNamed<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffGetterGenericNamed::T%> #this) → dynamic
   return self::GenericExtension|get#genericWriteSetterNamed<self::GenericExtension|get#tearOffGetterGenericNamed::T%>(#this);
-static method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
+static extension-member method GenericExtension|invocations<T extends core::Object? = dynamic, S extends self::GenericExtension|invocations::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|invocations::T%> #this, self::GenericExtension|invocations::S% value) → dynamic {
   self::GenericExtension|readGetter<self::GenericExtension|invocations::T%>(#this);
   self::GenericExtension|writeSetterRequired<self::GenericExtension|invocations::T%>(#this, value);
   self::GenericExtension|writeSetterOptional<self::GenericExtension|invocations::T%>(#this);
@@ -211,9 +211,9 @@ static method GenericExtension|invocations<T extends core::Object? = dynamic, S
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::T%>(#this, value: value);
   self::GenericExtension|genericWriteSetterNamed<self::GenericExtension|invocations::T%, self::GenericExtension|invocations::S%>(#this, value: value);
 }
-static method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#invocations<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#invocations::T%> #this) → <S extends self::GenericExtension|get#invocations::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#invocations::T% = dynamic>(S% value) → dynamic => self::GenericExtension|invocations<self::GenericExtension|get#invocations::T%, S%>(#this, value);
-static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
+static extension-member method GenericExtension|tearOffs<T extends core::Object? = dynamic, S extends self::GenericExtension|tearOffs::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|tearOffs::T%> #this, self::GenericExtension|tearOffs::S% value) → dynamic {
   () → self::GenericExtension|tearOffs::T? tearOffNoArgs = self::GenericExtension|get#readGetter<self::GenericExtension|tearOffs::T%>(#this);
   tearOffNoArgs(){() → self::GenericExtension|tearOffs::T?};
   (self::GenericExtension|tearOffs::T%) → dynamic tearOffRequired = self::GenericExtension|get#writeSetterRequired<self::GenericExtension|tearOffs::T%>(#this);
@@ -243,9 +243,9 @@ static method GenericExtension|tearOffs<T extends core::Object? = dynamic, S ext
   genericTearOffNamed<self::GenericExtension|tearOffs::T%>(value: value){({value: self::GenericExtension|tearOffs::T?}) → dynamic};
   genericTearOffNamed<self::GenericExtension|tearOffs::S%>(value: value){({value: self::GenericExtension|tearOffs::S?}) → dynamic};
 }
-static method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#tearOffs<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#tearOffs::T%> #this) → <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#tearOffs::T% = dynamic>(S% value) → dynamic => self::GenericExtension|tearOffs<self::GenericExtension|get#tearOffs::T%, S%>(#this, value);
-static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
+static extension-member method GenericExtension|getterCalls<T extends core::Object? = dynamic, S extends self::GenericExtension|getterCalls::T% = dynamic>(lowered final self::GenericClass<self::GenericExtension|getterCalls::T%> #this, self::GenericExtension|getterCalls::S% value) → dynamic {
   self::GenericExtension|get#tearOffGetterNoArgs<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
   self::GenericExtension|get#tearOffGetterRequired<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call(value);
   self::GenericExtension|get#tearOffGetterOptional<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call();
@@ -268,7 +268,7 @@ static method GenericExtension|getterCalls<T extends core::Object? = dynamic, S
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::T%>(value: value);
   self::GenericExtension|get#tearOffGetterGenericNamed<self::GenericExtension|getterCalls::T%>(#this){dynamic}.call<self::GenericExtension|getterCalls::S%>(value: value);
 }
-static method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
+static extension-member method GenericExtension|get#getterCalls<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#getterCalls::T%> #this) → <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S%) → dynamic
   return <S extends self::GenericExtension|get#getterCalls::T% = dynamic>(S% value) → dynamic => self::GenericExtension|getterCalls<self::GenericExtension|get#getterCalls::T%, S%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.expect
index b8cd31b3655..0e87e600e3d 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.expect
@@ -40,47 +40,47 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   return self::Class::field;
-static set Extension|property(dynamic value) → void {
+static extension-member set Extension|property(dynamic value) → void {
   self::Class::field = value;
 }
-static method Extension|readGetter() → dynamic {
+static extension-member method Extension|readGetter() → dynamic {
   return self::Extension|property;
 }
-static method Extension|writeSetterRequired(dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   return #C2;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   return #C3;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   return #C4;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   return #C5;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   return #C6;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   return #C7;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   return #C8;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -98,7 +98,7 @@ static method Extension|invocationsFromStaticContext(core::int value) → dynami
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
 }
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -123,11 +123,11 @@ static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
 }
-static method Extension|fieldAccessFromStaticContext() → dynamic {
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -145,7 +145,7 @@ static method Extension|getterCallsFromStaticContext(core::int value) → dynami
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<core::int>(value: value);
 }
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -163,9 +163,9 @@ static method Extension|invocationsFromInstanceContext<T extends core::Object? =
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -190,15 +190,15 @@ static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dy
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
 }
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -216,7 +216,7 @@ static method Extension|getterCallsFromInstanceContext<T extends core::Object? =
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<self::Extension|getterCallsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.transformed.expect
index b8cd31b3655..0e87e600e3d 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.strong.transformed.expect
@@ -40,47 +40,47 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   return self::Class::field;
-static set Extension|property(dynamic value) → void {
+static extension-member set Extension|property(dynamic value) → void {
   self::Class::field = value;
 }
-static method Extension|readGetter() → dynamic {
+static extension-member method Extension|readGetter() → dynamic {
   return self::Extension|property;
 }
-static method Extension|writeSetterRequired(dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   return #C2;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   return #C3;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   return #C4;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   return #C5;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   return #C6;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   return #C7;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   return #C8;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -98,7 +98,7 @@ static method Extension|invocationsFromStaticContext(core::int value) → dynami
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
 }
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -123,11 +123,11 @@ static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
 }
-static method Extension|fieldAccessFromStaticContext() → dynamic {
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -145,7 +145,7 @@ static method Extension|getterCallsFromStaticContext(core::int value) → dynami
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<core::int>(value: value);
 }
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -163,9 +163,9 @@ static method Extension|invocationsFromInstanceContext<T extends core::Object? =
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -190,15 +190,15 @@ static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dy
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
 }
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -216,7 +216,7 @@ static method Extension|getterCallsFromInstanceContext<T extends core::Object? =
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<self::Extension|getterCallsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.expect
index b8cd31b3655..0e87e600e3d 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.expect
@@ -40,47 +40,47 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   return self::Class::field;
-static set Extension|property(dynamic value) → void {
+static extension-member set Extension|property(dynamic value) → void {
   self::Class::field = value;
 }
-static method Extension|readGetter() → dynamic {
+static extension-member method Extension|readGetter() → dynamic {
   return self::Extension|property;
 }
-static method Extension|writeSetterRequired(dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   return #C2;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   return #C3;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   return #C4;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   return #C5;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   return #C6;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   return #C7;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   return #C8;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -98,7 +98,7 @@ static method Extension|invocationsFromStaticContext(core::int value) → dynami
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
 }
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -123,11 +123,11 @@ static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
 }
-static method Extension|fieldAccessFromStaticContext() → dynamic {
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -145,7 +145,7 @@ static method Extension|getterCallsFromStaticContext(core::int value) → dynami
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<core::int>(value: value);
 }
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -163,9 +163,9 @@ static method Extension|invocationsFromInstanceContext<T extends core::Object? =
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -190,15 +190,15 @@ static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dy
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
 }
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -216,7 +216,7 @@ static method Extension|getterCallsFromInstanceContext<T extends core::Object? =
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<self::Extension|getterCallsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.modular.expect
index b8cd31b3655..0e87e600e3d 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.modular.expect
@@ -40,47 +40,47 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   return self::Class::field;
-static set Extension|property(dynamic value) → void {
+static extension-member set Extension|property(dynamic value) → void {
   self::Class::field = value;
 }
-static method Extension|readGetter() → dynamic {
+static extension-member method Extension|readGetter() → dynamic {
   return self::Extension|property;
 }
-static method Extension|writeSetterRequired(dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   return #C2;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   return #C3;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   return #C4;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   return #C5;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   return #C6;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   return #C7;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   return #C8;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -98,7 +98,7 @@ static method Extension|invocationsFromStaticContext(core::int value) → dynami
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
 }
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -123,11 +123,11 @@ static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
 }
-static method Extension|fieldAccessFromStaticContext() → dynamic {
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -145,7 +145,7 @@ static method Extension|getterCallsFromStaticContext(core::int value) → dynami
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<core::int>(value: value);
 }
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -163,9 +163,9 @@ static method Extension|invocationsFromInstanceContext<T extends core::Object? =
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -190,15 +190,15 @@ static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dy
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
 }
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -216,7 +216,7 @@ static method Extension|getterCallsFromInstanceContext<T extends core::Object? =
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<self::Extension|getterCallsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.outline.expect
index f6e099690e1..b28d72d9220 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.outline.expect
@@ -39,61 +39,61 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   ;
-static set Extension|property(dynamic value) → void
+static extension-member set Extension|property(dynamic value) → void
   ;
-static method Extension|readGetter() → dynamic
+static extension-member method Extension|readGetter() → dynamic
   ;
-static method Extension|writeSetterRequired(dynamic value) → dynamic
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic
   ;
-static method Extension|writeSetterOptional([dynamic value]) → dynamic
+static extension-member method Extension|writeSetterOptional([dynamic value]) → dynamic
   ;
-static method Extension|writeSetterNamed({dynamic value}) → dynamic
+static extension-member method Extension|writeSetterNamed({dynamic value}) → dynamic
   ;
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic
   ;
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value]) → dynamic
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value]) → dynamic
   ;
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value}) → dynamic
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value}) → dynamic
   ;
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   ;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   ;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   ;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   ;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   ;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   ;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   ;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic
   ;
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic
   ;
-static method Extension|fieldAccessFromStaticContext() → dynamic
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic
   ;
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic
   ;
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic
   ;
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic
   ;
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic
   ;
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic
   ;
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.transformed.expect
index b8cd31b3655..0e87e600e3d 100644
--- a/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/direct_static_access.dart.weak.transformed.expect
@@ -40,47 +40,47 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   return self::Class::field;
-static set Extension|property(dynamic value) → void {
+static extension-member set Extension|property(dynamic value) → void {
   self::Class::field = value;
 }
-static method Extension|readGetter() → dynamic {
+static extension-member method Extension|readGetter() → dynamic {
   return self::Extension|property;
 }
-static method Extension|writeSetterRequired(dynamic value) → dynamic {
+static extension-member method Extension|writeSetterRequired(dynamic value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
+static extension-member method Extension|writeSetterOptional([dynamic value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
+static extension-member method Extension|writeSetterNamed({dynamic value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
+static extension-member method Extension|genericWriteSetterRequired<S extends core::Object? = dynamic>(self::Extension|genericWriteSetterRequired::S% value) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
+static extension-member method Extension|genericWriteSetterOptional<S extends core::Object? = dynamic>([self::Extension|genericWriteSetterOptional::S? value = #C1]) → dynamic {
   self::Extension|property = value;
 }
-static method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
+static extension-member method Extension|genericWriteSetterNamed<S extends core::Object? = dynamic>({self::Extension|genericWriteSetterNamed::S? value = #C1}) → dynamic {
   self::Extension|property = value;
 }
-static get Extension|tearOffGetterNoArgs() → dynamic
+static extension-member get Extension|tearOffGetterNoArgs() → dynamic
   return #C2;
-static get Extension|tearOffGetterRequired() → dynamic
+static extension-member get Extension|tearOffGetterRequired() → dynamic
   return #C3;
-static get Extension|tearOffGetterOptional() → dynamic
+static extension-member get Extension|tearOffGetterOptional() → dynamic
   return #C4;
-static get Extension|tearOffGetterNamed() → dynamic
+static extension-member get Extension|tearOffGetterNamed() → dynamic
   return #C5;
-static get Extension|tearOffGetterGenericRequired() → dynamic
+static extension-member get Extension|tearOffGetterGenericRequired() → dynamic
   return #C6;
-static get Extension|tearOffGetterGenericOptional() → dynamic
+static extension-member get Extension|tearOffGetterGenericOptional() → dynamic
   return #C7;
-static get Extension|tearOffGetterGenericNamed() → dynamic
+static extension-member get Extension|tearOffGetterGenericNamed() → dynamic
   return #C8;
-static method Extension|invocationsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|invocationsFromStaticContext(core::int value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -98,7 +98,7 @@ static method Extension|invocationsFromStaticContext(core::int value) → dynami
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
   self::Extension|genericWriteSetterNamed<core::int>(value: value);
 }
-static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -123,11 +123,11 @@ static method Extension|tearOffsFromStaticContext(core::int value) → dynamic {
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
   tearOffGenericNamed<core::int>(value: value){({value: core::int?}) → dynamic};
 }
-static method Extension|fieldAccessFromStaticContext() → dynamic {
+static extension-member method Extension|fieldAccessFromStaticContext() → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
+static extension-member method Extension|getterCallsFromStaticContext(core::int value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -145,7 +145,7 @@ static method Extension|getterCallsFromStaticContext(core::int value) → dynami
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<core::int>(value: value);
 }
-static method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|invocationsFromInstanceContext::T%> #this, self::Extension|invocationsFromInstanceContext::T% value) → dynamic {
   self::Extension|readGetter();
   self::Extension|writeSetterRequired(value);
   self::Extension|writeSetterOptional();
@@ -163,9 +163,9 @@ static method Extension|invocationsFromInstanceContext<T extends core::Object? =
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
   self::Extension|genericWriteSetterNamed<self::Extension|invocationsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#invocationsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#invocationsFromInstanceContext::T%> #this) → (self::Extension|get#invocationsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#invocationsFromInstanceContext::T% value) → dynamic => self::Extension|invocationsFromInstanceContext<self::Extension|get#invocationsFromInstanceContext::T%>(#this, value);
-static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|tearOffsFromInstanceContext::T%> #this, self::Extension|tearOffsFromInstanceContext::T% value) → dynamic {
   () → dynamic tearOffNoArgs = #C2;
   tearOffNoArgs(){() → dynamic};
   (dynamic) → dynamic tearOffRequired = #C3;
@@ -190,15 +190,15 @@ static method Extension|tearOffsFromInstanceContext<T extends core::Object? = dy
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
   tearOffGenericNamed<self::Extension|tearOffsFromInstanceContext::T%>(value: value){({value: self::Extension|tearOffsFromInstanceContext::T?}) → dynamic};
 }
-static method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#tearOffsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#tearOffsFromInstanceContext::T%> #this) → (self::Extension|get#tearOffsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#tearOffsFromInstanceContext::T% value) → dynamic => self::Extension|tearOffsFromInstanceContext<self::Extension|get#tearOffsFromInstanceContext::T%>(#this, value);
-static method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
+static extension-member method Extension|fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|fieldAccessFromInstanceContext::T%> #this) → dynamic {
   self::Extension|field = self::Extension|property;
   self::Extension|property = self::Extension|field;
 }
-static method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
+static extension-member method Extension|get#fieldAccessFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#fieldAccessFromInstanceContext::T%> #this) → () → dynamic
   return () → dynamic => self::Extension|fieldAccessFromInstanceContext<self::Extension|get#fieldAccessFromInstanceContext::T%>(#this);
-static method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
+static extension-member method Extension|getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|getterCallsFromInstanceContext::T%> #this, self::Extension|getterCallsFromInstanceContext::T% value) → dynamic {
   self::Extension|tearOffGetterNoArgs{dynamic}.call();
   self::Extension|tearOffGetterRequired{dynamic}.call(value);
   self::Extension|tearOffGetterOptional{dynamic}.call();
@@ -216,7 +216,7 @@ static method Extension|getterCallsFromInstanceContext<T extends core::Object? =
   self::Extension|tearOffGetterGenericNamed{dynamic}.call(value: value);
   self::Extension|tearOffGetterGenericNamed{dynamic}.call<self::Extension|getterCallsFromInstanceContext::T%>(value: value);
 }
-static method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
+static extension-member method Extension|get#getterCallsFromInstanceContext<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#getterCallsFromInstanceContext::T%> #this) → (self::Extension|get#getterCallsFromInstanceContext::T%) → dynamic
   return (self::Extension|get#getterCallsFromInstanceContext::T% value) → dynamic => self::Extension|getterCallsFromInstanceContext<self::Extension|get#getterCallsFromInstanceContext::T%>(#this, value);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.expect
index ff8958c42cc..02ea32ebe59 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.expect
@@ -17,13 +17,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   return 42;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   return 87;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   dynamic c0 = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.transformed.expect
index ff8958c42cc..02ea32ebe59 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.strong.transformed.expect
@@ -17,13 +17,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   return 42;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   return 87;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   dynamic c0 = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.expect
index ff8958c42cc..02ea32ebe59 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.expect
@@ -17,13 +17,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   return 42;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   return 87;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   dynamic c0 = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.modular.expect
index ff8958c42cc..02ea32ebe59 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.modular.expect
@@ -17,13 +17,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   return 42;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   return 87;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   dynamic c0 = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.outline.expect
index 006429140be..8ad9c40f3af 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.outline.expect
@@ -16,13 +16,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   ;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   ;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.transformed.expect
index ff8958c42cc..02ea32ebe59 100644
--- a/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/dynamic_invoke.dart.weak.transformed.expect
@@ -17,13 +17,13 @@ extension Extension on dynamic {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method ClassExtension|method(lowered final self::Class #this) → core::int
+static extension-member method ClassExtension|method(lowered final self::Class #this) → core::int
   return 42;
-static method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method ClassExtension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::ClassExtension|method(#this);
-static method Extension|method(lowered final dynamic #this) → core::int
+static extension-member method Extension|method(lowered final dynamic #this) → core::int
   return 87;
-static method Extension|get#method(lowered final dynamic #this) → () → core::int
+static extension-member method Extension|get#method(lowered final dynamic #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   dynamic c0 = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.expect
index 8316fbdc849..82994c6beec 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.expect
@@ -25,31 +25,31 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   return #this.{self::Class::field1}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   return #this.{self::Class::field2}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.transformed.expect
index e55dab15dfb..63f1ce24112 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.strong.transformed.expect
@@ -25,31 +25,31 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   return #this.{self::Class::field1}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   return #this.{self::Class::field2}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.expect
index 8316fbdc849..82994c6beec 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.expect
@@ -25,31 +25,31 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   return #this.{self::Class::field1}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   return #this.{self::Class::field2}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.modular.expect
index 8316fbdc849..82994c6beec 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.modular.expect
@@ -25,31 +25,31 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   return #this.{self::Class::field1}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   return #this.{self::Class::field2}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.outline.expect
index b6bb8c5c821..7abfb66d9ae 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.outline.expect
@@ -24,29 +24,29 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   ;
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   ;
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   ;
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   ;
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   ;
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   ;
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.transformed.expect
index e55dab15dfb..63f1ce24112 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_access.dart.weak.transformed.expect
@@ -25,31 +25,31 @@ extension Extension2 on self::Class {
   tearoff genericMethod = self::Extension2|get#genericMethod;
   set field = self::Extension2|set#field;
 }
-static method Extension1|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension1|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method(lowered final self::Class #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field1}{core::int};
-static method Extension1|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension1|genericMethod::T t) → core::num
   return #this.{self::Class::field1}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|get#field(lowered final self::Class #this) → core::int
+static extension-member method Extension2|get#field(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension2|set#field(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method(lowered final self::Class #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field2}{core::int};
-static method Extension2|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class #this, self::Extension2|genericMethod::T t) → core::num
   return #this.{self::Class::field2}{core::int}.{core::num::+}(t){(core::num) → core::num};
-static method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.expect
index cc463f4d0f5..95e05d7f42b 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.expect
@@ -56,15 +56,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.transformed.expect
index cc463f4d0f5..95e05d7f42b 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.strong.transformed.expect
@@ -56,15 +56,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.expect
index 0ae408d5001..305927be251 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.modular.expect
index 0ae408d5001..305927be251 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.modular.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.outline.expect
index b53122528b9..3a09b93f10e 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.outline.expect
@@ -45,15 +45,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   ;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   ;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   ;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.transformed.expect
index 0ae408d5001..305927be251 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference.dart.weak.transformed.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.expect
index 322e5b3cfc3..eafb050c951 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.transformed.expect
index 322e5b3cfc3..eafb050c951 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.strong.transformed.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.expect
index 322e5b3cfc3..eafb050c951 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.modular.expect
index 322e5b3cfc3..eafb050c951 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.modular.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.outline.expect
index dc857a57356..ffbf749d144 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.outline.expect
@@ -25,15 +25,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   ;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   ;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   ;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.transformed.expect
index 322e5b3cfc3..eafb050c951 100644
--- a/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_extension_inference2.dart.weak.transformed.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%>? #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%>? #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%>? #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%>? #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%>? #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.expect
index 02d8d7e9044..1410be17430 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.expect
@@ -27,38 +27,38 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
   self::Extension1|latestType = "${self::Extension1|get#field::T}";
   return #this.{self::Class::field1}{self::Extension1|get#field::T};
 }
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
   self::Extension1|latestType = "${self::Extension1|set#field::T}";
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
   self::Extension1|latestType = "${self::Extension1|method::T}";
   return #this.{self::Class::field1}{self::Extension1|method::T};
 }
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
   self::Extension1|latestType = "${self::Extension1|genericMethod::T}:${self::Extension1|genericMethod::S}";
   return #this.{self::Class::field1}{self::Extension1|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension1|genericMethod::T;
 }
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   return #this.{self::Class::field2}{self::Extension2|get#field::T};
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   return #this.{self::Class::field2}{self::Extension2|method::T};
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   return #this.{self::Class::field2}{self::Extension2|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension2|genericMethod::T;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>(42, 87);
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.transformed.expect
index 57f74b4dc74..b41f461f0fd 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.strong.transformed.expect
@@ -27,38 +27,38 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
   self::Extension1|latestType = "${self::Extension1|get#field::T}";
   return #this.{self::Class::field1}{self::Extension1|get#field::T};
 }
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
   self::Extension1|latestType = "${self::Extension1|set#field::T}";
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
   self::Extension1|latestType = "${self::Extension1|method::T}";
   return #this.{self::Class::field1}{self::Extension1|method::T};
 }
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
   self::Extension1|latestType = "${self::Extension1|genericMethod::T}:${self::Extension1|genericMethod::S}";
   return #this.{self::Class::field1}{self::Extension1|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension1|genericMethod::T;
 }
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   return #this.{self::Class::field2}{self::Extension2|get#field::T};
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   return #this.{self::Class::field2}{self::Extension2|method::T};
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   return #this.{self::Class::field2}{self::Extension2|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension2|genericMethod::T;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>(42, 87);
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.expect
index 02d8d7e9044..1410be17430 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.expect
@@ -27,38 +27,38 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
   self::Extension1|latestType = "${self::Extension1|get#field::T}";
   return #this.{self::Class::field1}{self::Extension1|get#field::T};
 }
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
   self::Extension1|latestType = "${self::Extension1|set#field::T}";
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
   self::Extension1|latestType = "${self::Extension1|method::T}";
   return #this.{self::Class::field1}{self::Extension1|method::T};
 }
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
   self::Extension1|latestType = "${self::Extension1|genericMethod::T}:${self::Extension1|genericMethod::S}";
   return #this.{self::Class::field1}{self::Extension1|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension1|genericMethod::T;
 }
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   return #this.{self::Class::field2}{self::Extension2|get#field::T};
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   return #this.{self::Class::field2}{self::Extension2|method::T};
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   return #this.{self::Class::field2}{self::Extension2|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension2|genericMethod::T;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>(42, 87);
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.modular.expect
index 02d8d7e9044..1410be17430 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.modular.expect
@@ -27,38 +27,38 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
   self::Extension1|latestType = "${self::Extension1|get#field::T}";
   return #this.{self::Class::field1}{self::Extension1|get#field::T};
 }
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
   self::Extension1|latestType = "${self::Extension1|set#field::T}";
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
   self::Extension1|latestType = "${self::Extension1|method::T}";
   return #this.{self::Class::field1}{self::Extension1|method::T};
 }
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
   self::Extension1|latestType = "${self::Extension1|genericMethod::T}:${self::Extension1|genericMethod::S}";
   return #this.{self::Class::field1}{self::Extension1|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension1|genericMethod::T;
 }
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   return #this.{self::Class::field2}{self::Extension2|get#field::T};
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   return #this.{self::Class::field2}{self::Extension2|method::T};
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   return #this.{self::Class::field2}{self::Extension2|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension2|genericMethod::T;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>(42, 87);
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.outline.expect
index 3efad7b91cb..2c286540717 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.outline.expect
@@ -26,29 +26,29 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T
   ;
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void
   ;
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T
   ;
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T
   ;
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   ;
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void
   ;
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   ;
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   ;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.transformed.expect
index 57f74b4dc74..b41f461f0fd 100644
--- a/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_generic_extension_access.dart.weak.transformed.expect
@@ -27,38 +27,38 @@ extension Extension2<T extends core::num> on self::Class<T> {
   set field = self::Extension2|set#field;
 }
 static field core::String? Extension1|latestType;
-static method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
+static extension-member method Extension1|get#field<T extends core::num>(lowered final self::Class<self::Extension1|get#field::T> #this) → self::Extension1|get#field::T {
   self::Extension1|latestType = "${self::Extension1|get#field::T}";
   return #this.{self::Class::field1}{self::Extension1|get#field::T};
 }
-static method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
+static extension-member method Extension1|set#field<T extends core::num>(lowered final self::Class<self::Extension1|set#field::T> #this, self::Extension1|set#field::T value) → void {
   self::Extension1|latestType = "${self::Extension1|set#field::T}";
   #this.{self::Class::field1} = value;
 }
-static method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
+static extension-member method Extension1|method<T extends core::num>(lowered final self::Class<self::Extension1|method::T> #this) → self::Extension1|method::T {
   self::Extension1|latestType = "${self::Extension1|method::T}";
   return #this.{self::Class::field1}{self::Extension1|method::T};
 }
-static method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
+static extension-member method Extension1|get#method<T extends core::num>(lowered final self::Class<self::Extension1|get#method::T> #this) → () → self::Extension1|get#method::T
   return () → self::Extension1|get#method::T => self::Extension1|method<self::Extension1|get#method::T>(#this);
-static method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
+static extension-member method Extension1|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension1|genericMethod::T> #this, self::Extension1|genericMethod::S t) → self::Extension1|genericMethod::T {
   self::Extension1|latestType = "${self::Extension1|genericMethod::T}:${self::Extension1|genericMethod::S}";
   return #this.{self::Class::field1}{self::Extension1|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension1|genericMethod::T;
 }
-static method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
+static extension-member method Extension1|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension1|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension1|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension1|get#genericMethod::T => self::Extension1|genericMethod<self::Extension1|get#genericMethod::T, S>(#this, t);
-static method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
+static extension-member method Extension2|get#field<T extends core::num>(lowered final self::Class<self::Extension2|get#field::T> #this) → self::Extension2|get#field::T
   return #this.{self::Class::field2}{self::Extension2|get#field::T};
-static method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
+static extension-member method Extension2|set#field<T extends core::num>(lowered final self::Class<self::Extension2|set#field::T> #this, self::Extension2|set#field::T value) → void {
   #this.{self::Class::field2} = value;
 }
-static method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
+static extension-member method Extension2|method<T extends core::num>(lowered final self::Class<self::Extension2|method::T> #this) → self::Extension2|method::T
   return #this.{self::Class::field2}{self::Extension2|method::T};
-static method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
+static extension-member method Extension2|get#method<T extends core::num>(lowered final self::Class<self::Extension2|get#method::T> #this) → () → self::Extension2|get#method::T
   return () → self::Extension2|get#method::T => self::Extension2|method<self::Extension2|get#method::T>(#this);
-static method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
+static extension-member method Extension2|genericMethod<T extends core::num, S extends core::num>(lowered final self::Class<self::Extension2|genericMethod::T> #this, self::Extension2|genericMethod::S t) → self::Extension2|genericMethod::T
   return #this.{self::Class::field2}{self::Extension2|genericMethod::T}.{core::num::+}(t){(core::num) → core::num} as self::Extension2|genericMethod::T;
-static method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
+static extension-member method Extension2|get#genericMethod<T extends core::num>(lowered final self::Class<self::Extension2|get#genericMethod::T> #this) → <S extends core::num>(S) → self::Extension2|get#genericMethod::T
   return <S extends core::num>(S t) → self::Extension2|get#genericMethod::T => self::Extension2|genericMethod<self::Extension2|get#genericMethod::T, S>(#this, t);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>(42, 87);
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.strong.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.strong.expect
index 747c520c30d..9d470323947 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.strong.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.strong.transformed.expect
index 747c520c30d..9d470323947 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.strong.transformed.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.expect
index 747c520c30d..9d470323947 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.modular.expect
index 747c520c30d..9d470323947 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.modular.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.outline.expect
index 736bec12324..b7a02f18cff 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.outline.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   ;
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   ;
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void
   ;
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.transformed.expect
index 747c520c30d..9d470323947 100644
--- a/pkg/front_end/testcases/extensions/explicit_this.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/explicit_this.dart.weak.transformed.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object) → void
   return (core::Object o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.expect b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.expect
index 00373288b14..752dffdadab 100644
--- a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.expect
@@ -43,16 +43,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.transformed.expect
index 00373288b14..752dffdadab 100644
--- a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.strong.transformed.expect
@@ -43,16 +43,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.expect b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.expect
index 00373288b14..752dffdadab 100644
--- a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.expect
@@ -43,16 +43,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.outline.expect
index 90ae6ebf7dc..5f13f8e21f4 100644
--- a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.outline.expect
@@ -33,19 +33,19 @@ extension Extension on core::int {
 static field core::int Extension|staticField;
 static final field core::int Extension|staticFinalField;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   ;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|instanceMethod(lowered final core::int #this) → void
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void
   ;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   ;
-static set Extension|staticProperty(core::int value) → void
+static extension-member set Extension|staticProperty(core::int value) → void
   ;
-static method Extension|staticMethod() → void
+static extension-member method Extension|staticMethod() → void
   ;
 
 constants  {
diff --git a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.transformed.expect
index 00373288b14..752dffdadab 100644
--- a/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/export_from_dill/main.dart.weak.transformed.expect
@@ -43,16 +43,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.strong.expect b/pkg/front_end/testcases/extensions/export_twice.dart.strong.expect
index 9732dc74b8f..ad7032c9290 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.strong.expect
@@ -22,8 +22,8 @@ extension Extension on exp::Class {
   method method = exp::Extension|method;
   tearoff method = exp::Extension|get#method;
 }
-static method Extension|method(lowered final exp::Class #this) → dynamic {}
-static method Extension|get#method(lowered final exp::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final exp::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final exp::Class #this) → () → dynamic
   return () → dynamic => exp::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/export_twice.dart.strong.transformed.expect
index 9732dc74b8f..ad7032c9290 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.strong.transformed.expect
@@ -22,8 +22,8 @@ extension Extension on exp::Class {
   method method = exp::Extension|method;
   tearoff method = exp::Extension|get#method;
 }
-static method Extension|method(lowered final exp::Class #this) → dynamic {}
-static method Extension|get#method(lowered final exp::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final exp::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final exp::Class #this) → () → dynamic
   return () → dynamic => exp::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.weak.expect b/pkg/front_end/testcases/extensions/export_twice.dart.weak.expect
index 9732dc74b8f..ad7032c9290 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.weak.expect
@@ -22,8 +22,8 @@ extension Extension on exp::Class {
   method method = exp::Extension|method;
   tearoff method = exp::Extension|get#method;
 }
-static method Extension|method(lowered final exp::Class #this) → dynamic {}
-static method Extension|get#method(lowered final exp::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final exp::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final exp::Class #this) → () → dynamic
   return () → dynamic => exp::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/export_twice.dart.weak.modular.expect
index 9732dc74b8f..ad7032c9290 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.weak.modular.expect
@@ -22,8 +22,8 @@ extension Extension on exp::Class {
   method method = exp::Extension|method;
   tearoff method = exp::Extension|get#method;
 }
-static method Extension|method(lowered final exp::Class #this) → dynamic {}
-static method Extension|get#method(lowered final exp::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final exp::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final exp::Class #this) → () → dynamic
   return () → dynamic => exp::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/export_twice.dart.weak.outline.expect
index 47d2b75fe6a..aefb1b8f7c2 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.weak.outline.expect
@@ -19,9 +19,9 @@ extension Extension on self2::Class {
   method method = self2::Extension|method;
   tearoff method = self2::Extension|get#method;
 }
-static method Extension|method(lowered final self2::Class #this) → dynamic
+static extension-member method Extension|method(lowered final self2::Class #this) → dynamic
   ;
-static method Extension|get#method(lowered final self2::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self2::Class #this) → () → dynamic
   return () → dynamic => self2::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/export_twice.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/export_twice.dart.weak.transformed.expect
index 9732dc74b8f..ad7032c9290 100644
--- a/pkg/front_end/testcases/extensions/export_twice.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/export_twice.dart.weak.transformed.expect
@@ -22,8 +22,8 @@ extension Extension on exp::Class {
   method method = exp::Extension|method;
   tearoff method = exp::Extension|get#method;
 }
-static method Extension|method(lowered final exp::Class #this) → dynamic {}
-static method Extension|get#method(lowered final exp::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final exp::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final exp::Class #this) → () → dynamic
   return () → dynamic => exp::Extension|method(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_call.dart.strong.expect
index 0490e695937..0e13b63f0d8 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.strong.expect
@@ -13,9 +13,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   return #this.{self::Class::method}(a){(self::Extension|call::T%) → self::Extension|call::T%};
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_call.dart.strong.transformed.expect
index 0490e695937..0e13b63f0d8 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.strong.transformed.expect
@@ -13,9 +13,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   return #this.{self::Class::method}(a){(self::Extension|call::T%) → self::Extension|call::T%};
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_call.dart.weak.expect
index 0490e695937..0e13b63f0d8 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.weak.expect
@@ -13,9 +13,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   return #this.{self::Class::method}(a){(self::Extension|call::T%) → self::Extension|call::T%};
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_call.dart.weak.modular.expect
index 0490e695937..0e13b63f0d8 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.weak.modular.expect
@@ -13,9 +13,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   return #this.{self::Class::method}(a){(self::Extension|call::T%) → self::Extension|call::T%};
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_call.dart.weak.outline.expect
index 4517532f29e..eecec36bb6b 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.weak.outline.expect
@@ -12,9 +12,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   ;
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_call.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_call.dart.weak.transformed.expect
index 0490e695937..0e13b63f0d8 100644
--- a/pkg/front_end/testcases/extensions/extension_call.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_call.dart.weak.transformed.expect
@@ -13,9 +13,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method call = self::Extension|call;
   tearoff call = self::Extension|get#call;
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|call::T%> #this, self::Extension|call::T% a) → self::Extension|call::T%
   return #this.{self::Class::method}(a){(self::Extension|call::T%) → self::Extension|call::T%};
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#call::T%> #this) → (self::Extension|get#call::T%) → self::Extension|get#call::T%
   return (self::Extension|get#call::T% a) → self::Extension|get#call::T% => self::Extension|call<self::Extension|get#call::T%>(#this, a);
 static method main() → dynamic {
   self::Class<core::int> c = new self::Class::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.expect
index 0eded0565dd..6bf29a1bf45 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.expect
@@ -34,7 +34,7 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.transformed.expect
index 0eded0565dd..6bf29a1bf45 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.strong.transformed.expect
@@ -34,7 +34,7 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.expect
index 0eded0565dd..6bf29a1bf45 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.expect
@@ -34,7 +34,7 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.modular.expect
index 0eded0565dd..6bf29a1bf45 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.modular.expect
@@ -34,7 +34,7 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.outline.expect
index 7d8048ee0c4..852cc1b96a9 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.outline.expect
@@ -33,9 +33,9 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.transformed.expect
index 0eded0565dd..6bf29a1bf45 100644
--- a/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_constructor.dart.weak.transformed.expect
@@ -34,7 +34,7 @@ extension Extension on self::Class {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method(lowered final self::Class #this) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.expect
index 48230a71bb7..d20a69e8345 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.expect
@@ -169,41 +169,41 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField = 0;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetter(core::int value) → void {}
-static method Extension|duplicateStaticMethod() → void {}
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void {}
+static extension-member method Extension|duplicateStaticMethod() → void {}
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.transformed.expect
index 48230a71bb7..d20a69e8345 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.strong.transformed.expect
@@ -169,41 +169,41 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField = 0;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetter(core::int value) → void {}
-static method Extension|duplicateStaticMethod() → void {}
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void {}
+static extension-member method Extension|duplicateStaticMethod() → void {}
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.expect
index 48230a71bb7..d20a69e8345 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.expect
@@ -169,41 +169,41 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField = 0;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetter(core::int value) → void {}
-static method Extension|duplicateStaticMethod() → void {}
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void {}
+static extension-member method Extension|duplicateStaticMethod() → void {}
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.modular.expect
index 48230a71bb7..d20a69e8345 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.modular.expect
@@ -169,41 +169,41 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField = 0;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetter(core::int value) → void {}
-static method Extension|duplicateStaticMethod() → void {}
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void {}
+static extension-member method Extension|duplicateStaticMethod() → void {}
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.outline.expect
index 1d8a06ddfeb..6e5fc9e14b1 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.outline.expect
@@ -169,55 +169,55 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void
   ;
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   ;
-static set Extension|duplicateStaticSetter(core::int value) → void
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void
   ;
-static method Extension|duplicateStaticMethod() → void
+static extension-member method Extension|duplicateStaticMethod() → void
   ;
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   ;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void
   ;
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   ;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void
   ;
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   ;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void
   ;
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void
   ;
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   ;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.transformed.expect
index 48230a71bb7..d20a69e8345 100644
--- a/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_member_conflict.dart.weak.transformed.expect
@@ -169,41 +169,41 @@ extension Extension<T extends core::Object? = dynamic> on core::int {
   set instanceSetterAndStaticField = self::Extension|set#instanceSetterAndStaticField;
 }
 static field core::int Extension|duplicateStaticField = 0;
-static method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#duplicateInstanceGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
-static method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
+static extension-member method Extension|set#duplicateInstanceSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → void {}
+static extension-member method Extension|get#duplicateInstanceMethod<T extends core::Object? = dynamic>(lowered final core::int #this) → () → void
   return () → void => self::Extension|duplicateInstanceMethod<self::Extension|get#duplicateInstanceMethod::T%>(#this);
-static get Extension|duplicateStaticGetter() → core::int
+static extension-member get Extension|duplicateStaticGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetter(core::int value) → void {}
-static method Extension|duplicateStaticMethod() → void {}
-static method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticSetter(core::int value) → void {}
+static extension-member method Extension|duplicateStaticMethod() → void {}
+static extension-member method Extension|get#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceGetterPlusSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#duplicateInstanceSetterPlusGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static get Extension|duplicateStaticGetterPlusSetter() → core::int
+static extension-member method Extension|set#duplicateInstanceGetterAndSetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterPlusSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
-static get Extension|duplicateStaticSetterPlusGetter() → core::int
+static extension-member set Extension|duplicateStaticGetterPlusSetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticSetterPlusGetter() → core::int
   return 0;
-static set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
-static get Extension|duplicateStaticGetterAndSetter() → core::int
+static extension-member set Extension|duplicateStaticSetterPlusGetter(core::int value) → void {}
+static extension-member get Extension|duplicateStaticGetterAndSetter() → core::int
   return 0;
-static set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member set Extension|duplicateStaticGetterAndSetter(core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticSetter<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
-static get Extension|instanceSetterAndStaticGetter() → core::int
+static extension-member set Extension|instanceGetterAndStaticSetter(core::int value) → void {}
+static extension-member get Extension|instanceSetterAndStaticGetter() → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
-static method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#instanceSetterAndStaticGetter<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|get#instanceGetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|set#instanceSetterAndStaticField<T extends core::Object? = dynamic>(lowered final core::int #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.strong.expect
index b40ddd228a9..15ee7b086d3 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.strong.expect
@@ -15,7 +15,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   return 2;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.strong.transformed.expect
index b40ddd228a9..15ee7b086d3 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.strong.transformed.expect
@@ -15,7 +15,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   return 2;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.expect
index b40ddd228a9..15ee7b086d3 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.expect
@@ -15,7 +15,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   return 2;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.modular.expect
index b40ddd228a9..15ee7b086d3 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.modular.expect
@@ -15,7 +15,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   return 2;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.outline.expect
index c9e9fb5c7cf..27652cfe11f 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.outline.expect
@@ -13,7 +13,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.transformed.expect
index b40ddd228a9..15ee7b086d3 100644
--- a/pkg/front_end/testcases/extensions/extension_methods.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_methods.dart.weak.transformed.expect
@@ -15,7 +15,7 @@ class C extends core::Object {
 extension E on self::C {
   get two = self::E|get#two;
 }
-static method E|get#two(lowered final self::C #this) → core::int
+static extension-member method E|get#two(lowered final self::C #this) → core::int
   return 2;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.strong.expect
index ce94c208f2b..89807c3eed7 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.strong.expect
@@ -55,35 +55,35 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
   value = value.{core::num::+}(1){(core::num*) →* core::int*};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
   if(value.{core::num::<}(0){(core::num*) →* core::bool*}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() →* core::int*};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic,ForLegacy} core::bool* ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) →* dynamic} as{TypeError,ForDynamic,ForLegacy} core::int*;
 }
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic {
   self::expect(null, #this.{self::Class::field}{core::int*});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int*});
@@ -109,9 +109,9 @@ static method Extension|testInternal(lowered final self::Class* #this) → dynam
   self::expect(4.{core::int::unary-}(){() →* core::int*}, let final core::int* #t11 = 4.{core::int::unary-}(){() →* core::int*} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int*});
 }
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
   self::expect(null, c.{self::Class::field}{core::int*});
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.strong.transformed.expect
index a1364b95d60..e80b88e8c52 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.strong.transformed.expect
@@ -55,35 +55,35 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
   value = value.{core::num::+}(1){(core::num*) →* core::int*};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
   if(value.{core::num::<}(0){(core::num*) →* core::bool*}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() →* core::int*};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic,ForLegacy} core::bool* ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) →* dynamic} as{TypeError,ForDynamic,ForLegacy} core::int*;
 }
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic {
   self::expect(null, #this.{self::Class::field}{core::int*});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int*});
@@ -109,9 +109,9 @@ static method Extension|testInternal(lowered final self::Class* #this) → dynam
   self::expect(4.{core::int::unary-}(){() →* core::int*}, let final core::int* #t11 = 4.{core::int::unary-}(){() →* core::int*} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int*});
 }
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
   self::expect(null, c.{self::Class::field}{core::int*});
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.expect
index 20cc272e296..b025a50468f 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.expect
@@ -48,35 +48,35 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
   value = value.{core::num::+}(1){(core::num*) →* core::int*};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
   if(value.{core::num::<}(0){(core::num*) →* core::bool*}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() →* core::int*};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic,ForLegacy} core::bool* ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) →* dynamic} as{TypeError,ForDynamic,ForLegacy} core::int*;
 }
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic {
   self::expect(null, #this.{self::Class::field}{core::int*});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int*});
@@ -102,9 +102,9 @@ static method Extension|testInternal(lowered final self::Class* #this) → dynam
   self::expect(4.{core::int::unary-}(){() →* core::int*}, let final core::int* #t11 = 4.{core::int::unary-}(){() →* core::int*} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int*});
 }
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
   self::expect(null, c.{self::Class::field}{core::int*});
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.modular.expect
index 20cc272e296..b025a50468f 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.modular.expect
@@ -48,35 +48,35 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
   value = value.{core::num::+}(1){(core::num*) →* core::int*};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
   if(value.{core::num::<}(0){(core::num*) →* core::bool*}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() →* core::int*};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic,ForLegacy} core::bool* ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) →* dynamic} as{TypeError,ForDynamic,ForLegacy} core::int*;
 }
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic {
   self::expect(null, #this.{self::Class::field}{core::int*});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int*});
@@ -102,9 +102,9 @@ static method Extension|testInternal(lowered final self::Class* #this) → dynam
   self::expect(4.{core::int::unary-}(){() →* core::int*}, let final core::int* #t11 = 4.{core::int::unary-}(){() →* core::int*} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int*});
 }
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
   self::expect(null, c.{self::Class::field}{core::int*});
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.outline.expect
index dc7dac8265c..15a0ad59016 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.outline.expect
@@ -46,27 +46,27 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic
   ;
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.transformed.expect
index 8b53c0fde05..55e53ec0286 100644
--- a/pkg/front_end/testcases/extensions/extension_setter.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter.dart.weak.transformed.expect
@@ -48,35 +48,35 @@ extension Extension on self::Class* {
 extension GenericExtension<T extends core::Object* = dynamic> on self::GenericClass<T*>* {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#simpleSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class* #this, core::int* value) → void {
   value = value.{core::num::+}(1){(core::num*) →* core::int*};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class* #this, core::int* value) → void {
   if(value.{core::num::<}(0){(core::num*) →* core::bool*}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() →* core::int*};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class* #this, core::int* value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic,ForLegacy} core::bool* ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) →* dynamic} as{TypeError,ForDynamic,ForLegacy} core::int*;
 }
-static method Extension|testInternal(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class* #this) → dynamic {
   self::expect(null, #this.{self::Class::field}{core::int*});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int*});
@@ -102,9 +102,9 @@ static method Extension|testInternal(lowered final self::Class* #this) → dynam
   self::expect(4.{core::int::unary-}(){() →* core::int*}, let final core::int* #t11 = 4.{core::int::unary-}(){() →* core::int*} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int*});
 }
-static method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T*>* #this, self::GenericExtension|set#setter::T* value) → void {}
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
   self::expect(null, c.{self::Class::field}{core::int*});
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.expect
index 13deddd59eb..aba26ae15ac 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.expect
@@ -31,40 +31,40 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   return #this.{self::Class::nullableField}{core::int?};
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::nullableField} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
   if(value.{core::num::<}(0){(core::num) → core::bool}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() → core::int};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic} core::bool ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) → dynamic} as{TypeError,ForDynamic} core::int;
 }
-static method Extension|testInternal(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic {
   self::expect(1.{core::int::unary-}(){() → core::int}, #this.{self::Class::field}{core::int});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int});
@@ -90,9 +90,9 @@ static method Extension|testInternal(lowered final self::Class #this) → dynami
   self::expect(4.{core::int::unary-}(){() → core::int}, let final core::int #t11 = 4.{core::int::unary-}(){() → core::int} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int});
 }
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•(1.{core::int::unary-}(){() → core::int});
   self::test(c, c);
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.transformed.expect
index 285d288cb5f..53de983bd9e 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.strong.transformed.expect
@@ -31,40 +31,40 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   return #this.{self::Class::nullableField}{core::int?};
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::nullableField} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
   if(value.{core::num::<}(0){(core::num) → core::bool}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() → core::int};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic} core::bool ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) → dynamic} as{TypeError,ForDynamic} core::int;
 }
-static method Extension|testInternal(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic {
   self::expect(1.{core::int::unary-}(){() → core::int}, #this.{self::Class::field}{core::int});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int});
@@ -90,9 +90,9 @@ static method Extension|testInternal(lowered final self::Class #this) → dynami
   self::expect(4.{core::int::unary-}(){() → core::int}, let final core::int #t11 = 4.{core::int::unary-}(){() → core::int} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int});
 }
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•(1.{core::int::unary-}(){() → core::int});
   self::test(c, c);
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.expect
index 13deddd59eb..aba26ae15ac 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.expect
@@ -31,40 +31,40 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   return #this.{self::Class::nullableField}{core::int?};
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::nullableField} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
   if(value.{core::num::<}(0){(core::num) → core::bool}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() → core::int};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic} core::bool ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) → dynamic} as{TypeError,ForDynamic} core::int;
 }
-static method Extension|testInternal(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic {
   self::expect(1.{core::int::unary-}(){() → core::int}, #this.{self::Class::field}{core::int});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int});
@@ -90,9 +90,9 @@ static method Extension|testInternal(lowered final self::Class #this) → dynami
   self::expect(4.{core::int::unary-}(){() → core::int}, let final core::int #t11 = 4.{core::int::unary-}(){() → core::int} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int});
 }
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•(1.{core::int::unary-}(){() → core::int});
   self::test(c, c);
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.modular.expect
index 13deddd59eb..aba26ae15ac 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.modular.expect
@@ -31,40 +31,40 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   return #this.{self::Class::nullableField}{core::int?};
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::nullableField} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
   if(value.{core::num::<}(0){(core::num) → core::bool}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() → core::int};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic} core::bool ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) → dynamic} as{TypeError,ForDynamic} core::int;
 }
-static method Extension|testInternal(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic {
   self::expect(1.{core::int::unary-}(){() → core::int}, #this.{self::Class::field}{core::int});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int});
@@ -90,9 +90,9 @@ static method Extension|testInternal(lowered final self::Class #this) → dynami
   self::expect(4.{core::int::unary-}(){() → core::int}, let final core::int #t11 = 4.{core::int::unary-}(){() → core::int} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int});
 }
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•(1.{core::int::unary-}(){() → core::int});
   self::test(c, c);
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.outline.expect
index 41af586a93f..60b462f22d1 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.outline.expect
@@ -29,31 +29,31 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   ;
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   ;
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void
   ;
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   ;
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   ;
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   ;
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension|testInternal(lowered final self::Class #this) → dynamic
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.transformed.expect
index 285d288cb5f..53de983bd9e 100644
--- a/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter2.dart.weak.transformed.expect
@@ -31,40 +31,40 @@ extension Extension on self::Class {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#simpleSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#simpleSetter(lowered final self::Class #this, core::int value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#simpleNullableSetter(lowered final self::Class #this) → core::int?
   return #this.{self::Class::nullableField}{core::int?};
-static method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#simpleNullableSetter(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::nullableField} = value;
 }
-static method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#mutatingSetter(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#mutatingSetter(lowered final self::Class #this, core::int value) → void {
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithReturn(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithReturn(lowered final self::Class #this, core::int value) → void {
   if(value.{core::num::<}(0){(core::num) → core::bool}) {
     #this.{self::Class::field} = value.{core::int::unary-}(){() → core::int};
     return;
   }
   #this.{self::Class::field} = value;
 }
-static method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#setterWithClosure(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
+static extension-member method Extension|set#setterWithClosure(lowered final self::Class #this, core::int value) → void {
   function abs(dynamic value) → dynamic {
     return value{dynamic}.<(0) as{TypeError,ForDynamic} core::bool ?{dynamic} value{dynamic}.unary-() : value;
   }
   #this.{self::Class::field} = abs(value){(dynamic) → dynamic} as{TypeError,ForDynamic} core::int;
 }
-static method Extension|testInternal(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testInternal(lowered final self::Class #this) → dynamic {
   self::expect(1.{core::int::unary-}(){() → core::int}, #this.{self::Class::field}{core::int});
   self::Extension|set#simpleSetter(#this, 0);
   self::expect(0, #this.{self::Class::field}{core::int});
@@ -90,9 +90,9 @@ static method Extension|testInternal(lowered final self::Class #this) → dynami
   self::expect(4.{core::int::unary-}(){() → core::int}, let final core::int #t11 = 4.{core::int::unary-}(){() → core::int} in let final void #t12 = self::Extension|set#setterWithClosure(#this, #t11) in #t11);
   self::expect(4, #this.{self::Class::field}{core::int});
 }
-static method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testInternal(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testInternal(#this);
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T% value) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•(1.{core::int::unary-}(){() → core::int});
   self::test(c, c);
diff --git a/pkg/front_end/testcases/extensions/extension_setter_error.dart.strong.expect b/pkg/front_end/testcases/extensions/extension_setter_error.dart.strong.expect
index 57334a71347..8f3c7f4d4f3 100644
--- a/pkg/front_end/testcases/extensions/extension_setter_error.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter_error.dart.strong.expect
@@ -18,7 +18,7 @@ class GenericClass<T extends core::Object? = dynamic> extends core::Object {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
 static method main() → dynamic {}
 static method error() → dynamic {
   self::GenericClass<core::int> genericClass = new self::GenericClass::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.expect b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.expect
index 57334a71347..8f3c7f4d4f3 100644
--- a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.expect
@@ -18,7 +18,7 @@ class GenericClass<T extends core::Object? = dynamic> extends core::Object {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
 static method main() → dynamic {}
 static method error() → dynamic {
   self::GenericClass<core::int> genericClass = new self::GenericClass::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.modular.expect
index 57334a71347..8f3c7f4d4f3 100644
--- a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.modular.expect
@@ -18,7 +18,7 @@ class GenericClass<T extends core::Object? = dynamic> extends core::Object {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void {}
 static method main() → dynamic {}
 static method error() → dynamic {
   self::GenericClass<core::int> genericClass = new self::GenericClass::•<core::int>();
diff --git a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.outline.expect
index 5336dfc2070..296875b065c 100644
--- a/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/extension_setter_error.dart.weak.outline.expect
@@ -9,7 +9,7 @@ class GenericClass<T extends core::Object? = dynamic> extends core::Object {
 extension GenericExtension<T extends core::Object? = dynamic> on self::GenericClass<T%> {
   set setter = self::GenericExtension|set#setter;
 }
-static method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void
+static extension-member method GenericExtension|set#setter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|set#setter::T%> #this, self::GenericExtension|set#setter::T? value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/external.dart.strong.expect b/pkg/front_end/testcases/extensions/external.dart.strong.expect
index a6a14f29654..ad6e46ef296 100644
--- a/pkg/front_end/testcases/extensions/external.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.strong.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic {
   core::List<core::int> list = <core::int>[];
   core::int value = self::Extension|get#field<core::int>(list);
diff --git a/pkg/front_end/testcases/extensions/external.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/external.dart.strong.transformed.expect
index da5be30241d..a267120e714 100644
--- a/pkg/front_end/testcases/extensions/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.strong.transformed.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic {
   core::List<core::int> list = core::_GrowableList::•<core::int>(0);
   core::int value = self::Extension|get#field<core::int>(list);
diff --git a/pkg/front_end/testcases/extensions/external.dart.weak.expect b/pkg/front_end/testcases/extensions/external.dart.weak.expect
index a6a14f29654..ad6e46ef296 100644
--- a/pkg/front_end/testcases/extensions/external.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.weak.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic {
   core::List<core::int> list = <core::int>[];
   core::int value = self::Extension|get#field<core::int>(list);
diff --git a/pkg/front_end/testcases/extensions/external.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/external.dart.weak.modular.expect
index a6a14f29654..ad6e46ef296 100644
--- a/pkg/front_end/testcases/extensions/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.weak.modular.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic {
   core::List<core::int> list = <core::int>[];
   core::int value = self::Extension|get#field<core::int>(list);
diff --git a/pkg/front_end/testcases/extensions/external.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/external.dart.weak.outline.expect
index 15a103295dc..66b3193d4bd 100644
--- a/pkg/front_end/testcases/extensions/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.weak.outline.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic
   ;
 static method main() → dynamic
diff --git a/pkg/front_end/testcases/extensions/external.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/external.dart.weak.transformed.expect
index da5be30241d..a267120e714 100644
--- a/pkg/front_end/testcases/extensions/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/external.dart.weak.transformed.expect
@@ -25,28 +25,28 @@ extension Extension<T extends core::num> on core::List<T> {
   set fieldSetter = self::Extension|set#fieldSetter;
   static set staticFieldSetter = set self::Extension|staticFieldSetter;
 }
-external static method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
-external static method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
-external static get Extension|staticField() → core::int;
-external static set Extension|staticField(core::int #externalFieldValue) → void;
-external static method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
-external static get Extension|staticFinalField() → core::int;
-external static method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
-static method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
+external static extension-member method Extension|get#field<T extends core::num>(lowered core::List<self::Extension|get#field::T> #this) → self::Extension|get#field::T;
+external static extension-member method Extension|set#field<T extends core::num>(lowered core::List<self::Extension|set#field::T> #this, self::Extension|set#field::T #externalFieldValue) → void;
+external static extension-member get Extension|staticField() → core::int;
+external static extension-member set Extension|staticField(core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalField<T extends core::num>(lowered core::List<self::Extension|get#finalField::T> #this) → self::Extension|get#finalField::T;
+external static extension-member get Extension|staticFinalField() → core::int;
+external static extension-member method Extension|method<T extends core::num>(lowered final core::List<self::Extension|method::T> #this) → self::Extension|method::T;
+static extension-member method Extension|get#method<T extends core::num>(lowered final core::List<self::Extension|get#method::T> #this) → () → self::Extension|get#method::T
   return () → self::Extension|get#method::T => self::Extension|method<self::Extension|get#method::T>(#this);
-external static method Extension|staticMethod() → core::int;
-external static method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
-external static get Extension|staticGetter() → core::int;
-external static method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
-external static set Extension|staticSetter(core::int value) → void;
-external static method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
-external static method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
-external static get Extension|staticProperty() → core::int;
-external static set Extension|staticProperty(core::int value) → void;
-external static method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
-external static method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
-external static get Extension|staticFieldSetter() → core::int;
-external static set Extension|staticFieldSetter(core::int value) → void;
+external static extension-member method Extension|staticMethod() → core::int;
+external static extension-member method Extension|get#getter<T extends core::num>(lowered final core::List<self::Extension|get#getter::T> #this) → self::Extension|get#getter::T;
+external static extension-member get Extension|staticGetter() → core::int;
+external static extension-member method Extension|set#setter<T extends core::num>(lowered final core::List<self::Extension|set#setter::T> #this, self::Extension|set#setter::T value) → void;
+external static extension-member set Extension|staticSetter(core::int value) → void;
+external static extension-member method Extension|get#property<T extends core::num>(lowered final core::List<self::Extension|get#property::T> #this) → self::Extension|get#property::T;
+external static extension-member method Extension|set#property<T extends core::num>(lowered final core::List<self::Extension|set#property::T> #this, self::Extension|set#property::T value) → void;
+external static extension-member get Extension|staticProperty() → core::int;
+external static extension-member set Extension|staticProperty(core::int value) → void;
+external static extension-member method Extension|get#fieldSetter<T extends core::num>(lowered core::List<self::Extension|get#fieldSetter::T> #this) → self::Extension|get#fieldSetter::T;
+external static extension-member method Extension|set#fieldSetter<T extends core::num>(lowered final core::List<self::Extension|set#fieldSetter::T> #this, self::Extension|set#fieldSetter::T value) → void;
+external static extension-member get Extension|staticFieldSetter() → core::int;
+external static extension-member set Extension|staticFieldSetter(core::int value) → void;
 static method test() → dynamic {
   core::List<core::int> list = core::_GrowableList::•<core::int>(0);
   core::int value = self::Extension|get#field<core::int>(list);
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.expect
index 0151ae65ad3..5b466ade1c6 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.expect
@@ -11,9 +11,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   return null;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic {
   let final dynamic #t1 = self::Extension|method<core::int, dynamic>(new self::Class::•<core::int>(), 0) in #t1 == null ?{core::String?} null : #t1.{core::Object::toString}(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.transformed.expect
index 0151ae65ad3..5b466ade1c6 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.strong.transformed.expect
@@ -11,9 +11,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   return null;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic {
   let final dynamic #t1 = self::Extension|method<core::int, dynamic>(new self::Class::•<core::int>(), 0) in #t1 == null ?{core::String?} null : #t1.{core::Object::toString}(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.expect
index 0151ae65ad3..5b466ade1c6 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.expect
@@ -11,9 +11,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   return null;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic {
   let final dynamic #t1 = self::Extension|method<core::int, dynamic>(new self::Class::•<core::int>(), 0) in #t1 == null ?{core::String?} null : #t1.{core::Object::toString}(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.modular.expect
index 0151ae65ad3..5b466ade1c6 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.modular.expect
@@ -11,9 +11,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   return null;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic {
   let final dynamic #t1 = self::Extension|method<core::int, dynamic>(new self::Class::•<core::int>(), 0) in #t1 == null ?{core::String?} null : #t1.{core::Object::toString}(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.outline.expect
index 48a5c1285dc..765d10d2145 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   ;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.transformed.expect
index 0151ae65ad3..5b466ade1c6 100644
--- a/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/generic_function_in_generic_extension.dart.weak.transformed.expect
@@ -11,9 +11,9 @@ extension Extension<T extends core::Object? = dynamic> on self::Class<T%> {
   method method = self::Extension|method;
   tearoff method = self::Extension|get#method;
 }
-static method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
+static extension-member method Extension|method<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method::T%> #this, self::Extension|method::T% t) → self::Extension|method::R?
   return null;
-static method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
+static extension-member method Extension|get#method<T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method::T%> #this) → <R extends core::Object? = dynamic>(self::Extension|get#method::T%) → R?
   return <R extends core::Object? = dynamic>(self::Extension|get#method::T% t) → R? => self::Extension|method<self::Extension|get#method::T%, R%>(#this, t);
 static method main() → dynamic {
   let final dynamic #t1 = self::Extension|method<core::int, dynamic>(new self::Class::•<core::int>(), 0) in #t1 == null ?{core::String?} null : #t1.{core::Object::toString}(){() → core::String};
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.expect
index 4336683bc0d..7c8b19a85dc 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.expect
@@ -83,15 +83,15 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   return 0;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•();
   self::expect(0, c.{self::Class::m1}{core::int});
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.transformed.expect
index 4336683bc0d..7c8b19a85dc 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.strong.transformed.expect
@@ -83,15 +83,15 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   return 0;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•();
   self::expect(0, c.{self::Class::m1}{core::int});
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.expect
index 4336683bc0d..7c8b19a85dc 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.expect
@@ -83,15 +83,15 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   return 0;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•();
   self::expect(0, c.{self::Class::m1}{core::int});
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.modular.expect
index 4336683bc0d..7c8b19a85dc 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.modular.expect
@@ -83,15 +83,15 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   return 0;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•();
   self::expect(0, c.{self::Class::m1}{core::int});
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.outline.expect
index 968cc84ffd1..b1aeb78bd87 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.outline.expect
@@ -20,17 +20,17 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void
   ;
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   ;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void
   ;
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   ;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   ;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.transformed.expect
index 4336683bc0d..7c8b19a85dc 100644
--- a/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/getter_setter_conflict.dart.weak.transformed.expect
@@ -83,15 +83,15 @@ extension Extension1 on self::Class {
   get m3 = self::Extension1|get#m3;
   set m4 = self::Extension1|set#m4;
 }
-static method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m2(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m1(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m2(lowered final self::Class #this) → core::int
   return 0;
-static method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
-static method Extension0|get#m4(lowered final self::Class #this) → core::int
+static extension-member method Extension0|set#m3(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension0|get#m4(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|get#m3(lowered final self::Class #this) → core::int
+static extension-member method Extension1|get#m3(lowered final self::Class #this) → core::int
   return 0;
-static method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
+static extension-member method Extension1|set#m4(lowered final self::Class #this, core::int x) → void {}
 static method main() → dynamic {
   self::Class c = new self::Class::•();
   self::expect(0, c.{self::Class::m1}{core::int});
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.strong.expect b/pkg/front_end/testcases/extensions/if_null.dart.strong.expect
index f08ffb9e70e..e15b41e3f44 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.strong.expect
@@ -31,14 +31,14 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/if_null.dart.strong.transformed.expect
index c8bff805062..86d3470d06e 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.strong.transformed.expect
@@ -31,14 +31,14 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.weak.expect b/pkg/front_end/testcases/extensions/if_null.dart.weak.expect
index ccecac56304..a6460a7a033 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.weak.expect
@@ -24,14 +24,14 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/if_null.dart.weak.modular.expect
index ccecac56304..a6460a7a033 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.weak.modular.expect
@@ -24,14 +24,14 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/if_null.dart.weak.outline.expect
index fc8cfa1ad7a..7c8caa417b6 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.weak.outline.expect
@@ -23,13 +23,13 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/if_null.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/if_null.dart.weak.transformed.expect
index 4df63e443e7..3c80b93032d 100644
--- a/pkg/front_end/testcases/extensions/if_null.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/if_null.dart.weak.transformed.expect
@@ -24,14 +24,14 @@ extension Extension on self::Class* {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.strong.expect b/pkg/front_end/testcases/extensions/if_null2.dart.strong.expect
index 36f5d1a0f19..9cf3759dcaf 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.strong.expect
@@ -15,16 +15,16 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = let final core::int? #t1 = value in #t1 == null ?{core::int} 0 : #t1{core::int};
 }
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   self::test(null);
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/if_null2.dart.strong.transformed.expect
index f1f10851c4c..ca1d9cc5234 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.strong.transformed.expect
@@ -15,16 +15,16 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = let final core::int? #t1 = value in #t1 == null ?{core::int} 0 : #t1{core::int};
 }
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   self::test(null);
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.weak.expect b/pkg/front_end/testcases/extensions/if_null2.dart.weak.expect
index 36f5d1a0f19..9cf3759dcaf 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.weak.expect
@@ -15,16 +15,16 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = let final core::int? #t1 = value in #t1 == null ?{core::int} 0 : #t1{core::int};
 }
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   self::test(null);
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/if_null2.dart.weak.modular.expect
index 36f5d1a0f19..9cf3759dcaf 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.weak.modular.expect
@@ -15,16 +15,16 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = let final core::int? #t1 = value in #t1 == null ?{core::int} 0 : #t1{core::int};
 }
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   self::test(null);
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/if_null2.dart.weak.outline.expect
index 85dfe942ae5..9cf102b7bd2 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.weak.outline.expect
@@ -14,15 +14,15 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   ;
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   ;
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void
   ;
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   ;
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/if_null2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/if_null2.dart.weak.transformed.expect
index f1f10851c4c..ca1d9cc5234 100644
--- a/pkg/front_end/testcases/extensions/if_null2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/if_null2.dart.weak.transformed.expect
@@ -15,16 +15,16 @@ extension Extension on self::Class {
   tearoff method = self::Extension|get#method;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#nullableProperty(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = let final core::int? #t1 = value in #t1 == null ?{core::int} 0 : #t1{core::int};
 }
-static method Extension|method(lowered final self::Class #this) → core::int
+static extension-member method Extension|method(lowered final self::Class #this) → core::int
   return #this.{self::Class::field}{core::int};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|method(#this);
 static method main() → dynamic {
   self::test(null);
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.expect
index 6159921a1fb..f7bbc6a1c34 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.expect
@@ -56,15 +56,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.transformed.expect
index 6159921a1fb..f7bbc6a1c34 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.strong.transformed.expect
@@ -56,15 +56,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.expect
index b8378e76fbb..3f5c0a73bcf 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.modular.expect
index b8378e76fbb..3f5c0a73bcf 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.modular.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.outline.expect
index b53122528b9..3a09b93f10e 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.outline.expect
@@ -45,15 +45,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   ;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   ;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   ;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.transformed.expect
index b8378e76fbb..3f5c0a73bcf 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference.dart.weak.transformed.expect
@@ -49,15 +49,15 @@ extension GenericExtension<T extends core::Object* = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
+static extension-member method GenericExtension|get#property<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T*>* #this) → self::GenericExtension|get#property::T*
   return null;
-static method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
+static extension-member method GenericExtension|method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T*>* #this, self::GenericExtension|method::T* t) → self::GenericExtension|method::T*
   return null;
-static method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
+static extension-member method GenericExtension|get#method<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T*>* #this) → (self::GenericExtension|get#method::T*) →* self::GenericExtension|get#method::T*
   return (self::GenericExtension|get#method::T* t) → self::GenericExtension|get#method::T* => self::GenericExtension|method<self::GenericExtension|get#method::T*>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
+static extension-member method GenericExtension|genericMethod1<T extends core::Object* = dynamic, S extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T*>* #this, self::GenericExtension|genericMethod1::S* s) → self::GenericExtension|genericMethod1::S*
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object* = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T*>* #this) → <S extends core::Object* = dynamic>(S*) →* S*
   return <S extends core::Object* = dynamic>(S* s) → S* => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T*, S*>(#this, s);
 static method main() → dynamic {
   self::A* aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.expect
index 35cfe2738f2..e5604fae6a6 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.transformed.expect
index 35cfe2738f2..e5604fae6a6 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.strong.transformed.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.expect
index 35cfe2738f2..e5604fae6a6 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.modular.expect
index 35cfe2738f2..e5604fae6a6 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.modular.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.outline.expect
index ffb90445abd..7a1fc02de62 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.outline.expect
@@ -25,15 +25,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   ;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   ;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   ;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.transformed.expect
index 35cfe2738f2..e5604fae6a6 100644
--- a/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_extension_inference2.dart.weak.transformed.expect
@@ -29,15 +29,15 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method genericMethod1 = self::GenericExtension|genericMethod1;
   tearoff genericMethod1 = self::GenericExtension|get#genericMethod1;
 }
-static method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
+static extension-member method GenericExtension|get#property<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#property::T%> #this) → self::GenericExtension|get#property::T?
   return null;
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this, self::GenericExtension|method::T? t) → self::GenericExtension|method::T?
   return null;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → (self::GenericExtension|get#method::T?) → self::GenericExtension|get#method::T?
   return (self::GenericExtension|get#method::T? t) → self::GenericExtension|get#method::T? => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this, t);
-static method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
+static extension-member method GenericExtension|genericMethod1<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|genericMethod1::T%> #this, self::GenericExtension|genericMethod1::S? s) → self::GenericExtension|genericMethod1::S?
   return null;
-static method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
+static extension-member method GenericExtension|get#genericMethod1<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#genericMethod1::T%> #this) → <S extends core::Object? = dynamic>(S?) → S?
   return <S extends core::Object? = dynamic>(S? s) → S? => self::GenericExtension|genericMethod1<self::GenericExtension|get#genericMethod1::T%, S%>(#this, s);
 static method main() → dynamic {
   self::A? aVariable;
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.strong.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.strong.expect
index 798984540e8..22d60e32ab9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.strong.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.strong.transformed.expect
index 798984540e8..22d60e32ab9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.strong.transformed.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.expect
index 798984540e8..22d60e32ab9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.modular.expect
index 798984540e8..22d60e32ab9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.modular.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.outline.expect
index 6f4ffc4f0a6..f03cebe2db9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.outline.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   ;
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   ;
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void
   ;
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.transformed.expect
index 798984540e8..22d60e32ab9 100644
--- a/pkg/front_end/testcases/extensions/implicit_this.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/implicit_this.dart.weak.transformed.expect
@@ -17,17 +17,17 @@ extension A2 on self::A1 {
   method method4 = self::A2|method4;
   tearoff method4 = self::A2|get#method4;
 }
-static method A2|method2(lowered final self::A1 #this) → void
+static extension-member method A2|method2(lowered final self::A1 #this) → void
   return #this.{self::A1::method1}(){() → void};
-static method A2|get#method2(lowered final self::A1 #this) → () → void
+static extension-member method A2|get#method2(lowered final self::A1 #this) → () → void
   return () → void => self::A2|method2(#this);
-static method A2|method3(lowered final self::A1 #this) → core::Object?
+static extension-member method A2|method3(lowered final self::A1 #this) → core::Object?
   return #this.{self::A1::field}{core::Object?};
-static method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
+static extension-member method A2|get#method3(lowered final self::A1 #this) → () → core::Object?
   return () → core::Object? => self::A2|method3(#this);
-static method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
+static extension-member method A2|method4(lowered final self::A1 #this, core::Object? o) → void {
   #this.{self::A1::field} = o;
 }
-static method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
+static extension-member method A2|get#method4(lowered final self::A1 #this) → (core::Object?) → void
   return (core::Object? o) → void => self::A2|method4(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.expect b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.expect
index 24d1de8d3d6..9d48598381f 100644
--- a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.expect
@@ -35,16 +35,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.transformed.expect
index 24d1de8d3d6..9d48598381f 100644
--- a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.strong.transformed.expect
@@ -35,16 +35,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.expect b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.expect
index 24d1de8d3d6..9d48598381f 100644
--- a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.expect
@@ -35,16 +35,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.outline.expect
index 9cd4185663b..98f5f36b5e2 100644
--- a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.outline.expect
@@ -25,19 +25,19 @@ extension Extension on core::int {
 static field core::int Extension|staticField;
 static final field core::int Extension|staticFinalField;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   ;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|instanceMethod(lowered final core::int #this) → void
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void
   ;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => self2::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   ;
-static set Extension|staticProperty(core::int value) → void
+static extension-member set Extension|staticProperty(core::int value) → void
   ;
-static method Extension|staticMethod() → void
+static extension-member method Extension|staticMethod() → void
   ;
 
 constants  {
diff --git a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.transformed.expect
index 24d1de8d3d6..9d48598381f 100644
--- a/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/import_from_dill/main.dart.weak.transformed.expect
@@ -35,16 +35,16 @@ extension Extension on core::int {
 static field core::int Extension|staticField = 42;
 static final field core::int Extension|staticFinalField = 42;
 static const field core::int Extension|staticConstField = #C1;
-static method Extension|get#instanceProperty(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceProperty(lowered final core::int #this) → core::int
   return 42;
-static method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
-static method Extension|instanceMethod(lowered final core::int #this) → void {}
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → void
+static extension-member method Extension|set#instanceProperty(lowered final core::int #this, core::int value) → void {}
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → void {}
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → void
   return () → void => mai::Extension|instanceMethod(#this);
-static get Extension|staticProperty() → core::int
+static extension-member get Extension|staticProperty() → core::int
   return 42;
-static set Extension|staticProperty(core::int value) → void {}
-static method Extension|staticMethod() → void {}
+static extension-member set Extension|staticProperty(core::int value) → void {}
+static extension-member method Extension|staticMethod() → void {}
 
 constants  {
   #C1 = 42
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.expect
index 160a405829c..7d841c489da 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.expect
@@ -21,7 +21,7 @@ extension Extension on core::String {
   method method = imp::Extension|method;
   tearoff method = imp::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   return #this.{core::String::length}{core::int};
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => imp::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.transformed.expect
index 160a405829c..7d841c489da 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.strong.transformed.expect
@@ -21,7 +21,7 @@ extension Extension on core::String {
   method method = imp::Extension|method;
   tearoff method = imp::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   return #this.{core::String::length}{core::int};
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => imp::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.expect
index 160a405829c..7d841c489da 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.expect
@@ -21,7 +21,7 @@ extension Extension on core::String {
   method method = imp::Extension|method;
   tearoff method = imp::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   return #this.{core::String::length}{core::int};
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => imp::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.modular.expect
index 160a405829c..7d841c489da 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.modular.expect
@@ -21,7 +21,7 @@ extension Extension on core::String {
   method method = imp::Extension|method;
   tearoff method = imp::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   return #this.{core::String::length}{core::int};
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => imp::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.outline.expect
index 5636a62e0b2..32baffda533 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.outline.expect
@@ -16,7 +16,7 @@ extension Extension on core::String {
   method method = self2::Extension|method;
   tearoff method = self2::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   ;
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => self2::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.transformed.expect
index 160a405829c..7d841c489da 100644
--- a/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/import_via_prefix.dart.weak.transformed.expect
@@ -21,7 +21,7 @@ extension Extension on core::String {
   method method = imp::Extension|method;
   tearoff method = imp::Extension|get#method;
 }
-static method Extension|method(lowered final core::String #this) → core::int
+static extension-member method Extension|method(lowered final core::String #this) → core::int
   return #this.{core::String::length}{core::int};
-static method Extension|get#method(lowered final core::String #this) → () → core::int
+static extension-member method Extension|get#method(lowered final core::String #this) → () → core::int
   return () → core::int => imp::Extension|method(#this);
diff --git a/pkg/front_end/testcases/extensions/index.dart.strong.expect b/pkg/front_end/testcases/extensions/index.dart.strong.expect
index 68ff9838f8a..62b823f23bc 100644
--- a/pkg/front_end/testcases/extensions/index.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.strong.expect
@@ -33,9 +33,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   return #this.{self::MapLike::get}(key){(core::Object*) →* self::Extension|[]::V*};
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K*, self::Extension|[]=::V*) →* self::Extension|[]=::V*};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/index.dart.strong.transformed.expect
index 7969db941d5..5585146bbbe 100644
--- a/pkg/front_end/testcases/extensions/index.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.strong.transformed.expect
@@ -33,9 +33,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   return #this.{self::MapLike::get}(key){(core::Object*) →* self::Extension|[]::V*};
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K*, self::Extension|[]=::V*) →* self::Extension|[]=::V*};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index.dart.weak.expect b/pkg/front_end/testcases/extensions/index.dart.weak.expect
index b0a6f0fd60f..d909a585c75 100644
--- a/pkg/front_end/testcases/extensions/index.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.weak.expect
@@ -26,9 +26,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   return #this.{self::MapLike::get}(key){(core::Object*) →* self::Extension|[]::V*};
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K*, self::Extension|[]=::V*) →* self::Extension|[]=::V*};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/index.dart.weak.modular.expect
index b0a6f0fd60f..d909a585c75 100644
--- a/pkg/front_end/testcases/extensions/index.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.weak.modular.expect
@@ -26,9 +26,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   return #this.{self::MapLike::get}(key){(core::Object*) →* self::Extension|[]::V*};
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K*, self::Extension|[]=::V*) →* self::Extension|[]=::V*};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/index.dart.weak.outline.expect
index b0a827973eb..40f7a9375fa 100644
--- a/pkg/front_end/testcases/extensions/index.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.weak.outline.expect
@@ -25,9 +25,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   ;
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/index.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/index.dart.weak.transformed.expect
index fe50997f10b..98429bb2b10 100644
--- a/pkg/front_end/testcases/extensions/index.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/index.dart.weak.transformed.expect
@@ -26,9 +26,9 @@ extension Extension<K extends core::Object* = dynamic, V extends core::Object* =
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
+static extension-member method Extension|[]<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]::K*, self::Extension|[]::V*>* #this, core::Object* key) → self::Extension|[]::V*
   return #this.{self::MapLike::get}(key){(core::Object*) →* self::Extension|[]::V*};
-static method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
+static extension-member method Extension|[]=<K extends core::Object* = dynamic, V extends core::Object* = dynamic>(lowered final self::MapLike<self::Extension|[]=::K*, self::Extension|[]=::V*>* #this, self::Extension|[]=::K* key, self::Extension|[]=::V* value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K*, self::Extension|[]=::V*) →* self::Extension|[]=::V*};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index2.dart.strong.expect b/pkg/front_end/testcases/extensions/index2.dart.strong.expect
index 2d53d9c8088..f9a63df369b 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.strong.expect
@@ -31,13 +31,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   return #this.{self::MapLike::get}(key){(core::Object) → self::Extension|[]::V?};
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K%, self::Extension|[]=::V%) → self::Extension|[]=::V%};
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   return #this.{self::MapLike2::get}(key){(core::Object) → self::Extension2|[]::V%};
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   return #this.{self::MapLike2::put}(key, value){(self::Extension2|[]=::K%, self::Extension2|[]=::V%) → self::Extension2|[]=::V%};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/index2.dart.strong.transformed.expect
index c5495e7333a..c48667af1ae 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.strong.transformed.expect
@@ -31,13 +31,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   return #this.{self::MapLike::get}(key){(core::Object) → self::Extension|[]::V?};
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K%, self::Extension|[]=::V%) → self::Extension|[]=::V%};
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   return #this.{self::MapLike2::get}(key){(core::Object) → self::Extension2|[]::V%};
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   return #this.{self::MapLike2::put}(key, value){(self::Extension2|[]=::K%, self::Extension2|[]=::V%) → self::Extension2|[]=::V%};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index2.dart.weak.expect b/pkg/front_end/testcases/extensions/index2.dart.weak.expect
index 2d53d9c8088..f9a63df369b 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.weak.expect
@@ -31,13 +31,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   return #this.{self::MapLike::get}(key){(core::Object) → self::Extension|[]::V?};
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K%, self::Extension|[]=::V%) → self::Extension|[]=::V%};
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   return #this.{self::MapLike2::get}(key){(core::Object) → self::Extension2|[]::V%};
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   return #this.{self::MapLike2::put}(key, value){(self::Extension2|[]=::K%, self::Extension2|[]=::V%) → self::Extension2|[]=::V%};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/index2.dart.weak.modular.expect
index 2d53d9c8088..f9a63df369b 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.weak.modular.expect
@@ -31,13 +31,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   return #this.{self::MapLike::get}(key){(core::Object) → self::Extension|[]::V?};
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K%, self::Extension|[]=::V%) → self::Extension|[]=::V%};
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   return #this.{self::MapLike2::get}(key){(core::Object) → self::Extension2|[]::V%};
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   return #this.{self::MapLike2::put}(key, value){(self::Extension2|[]=::K%, self::Extension2|[]=::V%) → self::Extension2|[]=::V%};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/index2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/index2.dart.weak.outline.expect
index 401679551f2..49a6744f5b9 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.weak.outline.expect
@@ -29,13 +29,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   ;
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   ;
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   ;
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/index2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/index2.dart.weak.transformed.expect
index c5495e7333a..c48667af1ae 100644
--- a/pkg/front_end/testcases/extensions/index2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/index2.dart.weak.transformed.expect
@@ -31,13 +31,13 @@ extension Extension2<K extends core::Object? = dynamic, V extends core::Object?
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
+static extension-member method Extension|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]::K%, self::Extension|[]::V%> #this, core::Object key) → self::Extension|[]::V?
   return #this.{self::MapLike::get}(key){(core::Object) → self::Extension|[]::V?};
-static method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
+static extension-member method Extension|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike<self::Extension|[]=::K%, self::Extension|[]=::V%> #this, self::Extension|[]=::K% key, self::Extension|[]=::V% value) → void
   return #this.{self::MapLike::put}(key, value){(self::Extension|[]=::K%, self::Extension|[]=::V%) → self::Extension|[]=::V%};
-static method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
+static extension-member method Extension2|[]<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]::K%, self::Extension2|[]::V%> #this, core::Object key) → self::Extension2|[]::V%
   return #this.{self::MapLike2::get}(key){(core::Object) → self::Extension2|[]::V%};
-static method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
+static extension-member method Extension2|[]=<K extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final self::MapLike2<self::Extension2|[]=::K%, self::Extension2|[]=::V%> #this, self::Extension2|[]=::K% key, self::Extension2|[]=::V% value) → void
   return #this.{self::MapLike2::put}(key, value){(self::Extension2|[]=::K%, self::Extension2|[]=::V%) → self::Extension2|[]=::V%};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.strong.expect b/pkg/front_end/testcases/extensions/instance_access.dart.strong.expect
index fa886135d2a..1eb52ddbe67 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.strong.expect
@@ -34,44 +34,44 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/instance_access.dart.strong.transformed.expect
index 9e0f881d05a..7c3964a4ebe 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.strong.transformed.expect
@@ -34,44 +34,44 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.weak.expect b/pkg/front_end/testcases/extensions/instance_access.dart.weak.expect
index fa886135d2a..1eb52ddbe67 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.weak.expect
@@ -34,44 +34,44 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/instance_access.dart.weak.modular.expect
index fa886135d2a..1eb52ddbe67 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.weak.modular.expect
@@ -34,44 +34,44 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/instance_access.dart.weak.outline.expect
index 7e875538d64..ac19fc96502 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.weak.outline.expect
@@ -32,29 +32,29 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int
   ;
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num
   ;
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int
   ;
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void
   ;
-static method Extension2|method(lowered final self::Class2 #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int
   ;
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num
   ;
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int
   ;
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/instance_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/instance_access.dart.weak.transformed.expect
index 9e0f881d05a..7c3964a4ebe 100644
--- a/pkg/front_end/testcases/extensions/instance_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_access.dart.weak.transformed.expect
@@ -34,44 +34,44 @@ extension Extension2 on self::Class2 {
   get property = self::Extension2|get#property;
   set property = self::Extension2|set#property;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension1|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method Extension1|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
-static method Extension2|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method Extension2|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.expect
index a7281c44612..d006b85c37d 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.expect
@@ -53,14 +53,14 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField = 42;
-static method Extension1|staticMethod() → dynamic {
+static extension-member method Extension1|staticMethod() → dynamic {
   core::print("Extension1.staticMethod()");
 }
-static get Extension1|staticProperty() → core::int {
+static extension-member get Extension1|staticProperty() → core::int {
   core::print("Extension1.staticProperty()");
   return 0;
 }
-static set Extension1|staticProperty(core::int value) → void {
+static extension-member set Extension1|staticProperty(core::int value) → void {
   core::print("Extension1.staticProperty(${value})");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.transformed.expect
index a7281c44612..d006b85c37d 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.strong.transformed.expect
@@ -53,14 +53,14 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField = 42;
-static method Extension1|staticMethod() → dynamic {
+static extension-member method Extension1|staticMethod() → dynamic {
   core::print("Extension1.staticMethod()");
 }
-static get Extension1|staticProperty() → core::int {
+static extension-member get Extension1|staticProperty() → core::int {
   core::print("Extension1.staticProperty()");
   return 0;
 }
-static set Extension1|staticProperty(core::int value) → void {
+static extension-member set Extension1|staticProperty(core::int value) → void {
   core::print("Extension1.staticProperty(${value})");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.expect
index a7281c44612..d006b85c37d 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.expect
@@ -53,14 +53,14 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField = 42;
-static method Extension1|staticMethod() → dynamic {
+static extension-member method Extension1|staticMethod() → dynamic {
   core::print("Extension1.staticMethod()");
 }
-static get Extension1|staticProperty() → core::int {
+static extension-member get Extension1|staticProperty() → core::int {
   core::print("Extension1.staticProperty()");
   return 0;
 }
-static set Extension1|staticProperty(core::int value) → void {
+static extension-member set Extension1|staticProperty(core::int value) → void {
   core::print("Extension1.staticProperty(${value})");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.modular.expect
index a7281c44612..d006b85c37d 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.modular.expect
@@ -53,14 +53,14 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField = 42;
-static method Extension1|staticMethod() → dynamic {
+static extension-member method Extension1|staticMethod() → dynamic {
   core::print("Extension1.staticMethod()");
 }
-static get Extension1|staticProperty() → core::int {
+static extension-member get Extension1|staticProperty() → core::int {
   core::print("Extension1.staticProperty()");
   return 0;
 }
-static set Extension1|staticProperty(core::int value) → void {
+static extension-member set Extension1|staticProperty(core::int value) → void {
   core::print("Extension1.staticProperty(${value})");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.outline.expect
index fcea730592c..2c3a48c9501 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.outline.expect
@@ -13,11 +13,11 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField;
-static method Extension1|staticMethod() → dynamic
+static extension-member method Extension1|staticMethod() → dynamic
   ;
-static get Extension1|staticProperty() → core::int
+static extension-member get Extension1|staticProperty() → core::int
   ;
-static set Extension1|staticProperty(core::int value) → void
+static extension-member set Extension1|staticProperty(core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.transformed.expect
index a7281c44612..d006b85c37d 100644
--- a/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_access_of_static.dart.weak.transformed.expect
@@ -53,14 +53,14 @@ extension Extension1 on self::Class1 {
   static set staticProperty = set self::Extension1|staticProperty;
 }
 static field core::int Extension1|staticField = 42;
-static method Extension1|staticMethod() → dynamic {
+static extension-member method Extension1|staticMethod() → dynamic {
   core::print("Extension1.staticMethod()");
 }
-static get Extension1|staticProperty() → core::int {
+static extension-member get Extension1|staticProperty() → core::int {
   core::print("Extension1.staticProperty()");
   return 0;
 }
-static set Extension1|staticProperty(core::int value) → void {
+static extension-member set Extension1|staticProperty(core::int value) → void {
   core::print("Extension1.staticProperty(${value})");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.strong.expect b/pkg/front_end/testcases/extensions/instance_members.dart.strong.expect
index 476f763a0fb..26e25bd83e5 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.strong.expect
@@ -28,39 +28,39 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o = #C1]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o = #C1}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/instance_members.dart.strong.transformed.expect
index 476f763a0fb..26e25bd83e5 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.strong.transformed.expect
@@ -28,39 +28,39 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o = #C1]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o = #C1}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.weak.expect b/pkg/front_end/testcases/extensions/instance_members.dart.weak.expect
index 476f763a0fb..26e25bd83e5 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.weak.expect
@@ -28,39 +28,39 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o = #C1]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o = #C1}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/instance_members.dart.weak.modular.expect
index 476f763a0fb..26e25bd83e5 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.weak.modular.expect
@@ -28,39 +28,39 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o = #C1]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o = #C1}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/instance_members.dart.weak.outline.expect
index 5ed6783a283..f16e82e0b36 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.weak.outline.expect
@@ -26,29 +26,29 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1
   ;
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1
   ;
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o]) → self::A1
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o]) → self::A1
   ;
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o}) → self::A1
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o}) → self::A1
   ;
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%>
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%>
   ;
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%>
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%>
   ;
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/instance_members.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/instance_members.dart.weak.transformed.expect
index 476f763a0fb..26e25bd83e5 100644
--- a/pkg/front_end/testcases/extensions/instance_members.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_members.dart.weak.transformed.expect
@@ -28,39 +28,39 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
+static extension-member method A2|method3<T extends core::Object? = dynamic>(lowered final self::A1 #this, [self::A2|method3::T? o = #C1]) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
+static extension-member method A2|get#method3(lowered final self::A1 #this) → <T extends core::Object? = dynamic>([T?]) → self::A1
   return <T extends core::Object? = dynamic>([T? o = #C1]) → self::A1 => self::A2|method3<T%>(#this, o);
-static method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
+static extension-member method A2|method4<T extends core::Object? = dynamic>(lowered final self::A1 #this, {self::A2|method4::T? o = #C1}) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
+static extension-member method A2|get#method4(lowered final self::A1 #this) → <T extends core::Object? = dynamic>({o: T?}) → self::A1
   return <T extends core::Object? = dynamic>({T? o = #C1}) → self::A1 => self::A2|method4<T%>(#this, o: o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.expect
index 44493ddddeb..da5fc4c23e5 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.expect
@@ -30,29 +30,29 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(2){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(3){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::testExtension1();
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.transformed.expect
index a25b507a039..ff1dd59e878 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.strong.transformed.expect
@@ -30,29 +30,29 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(2){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(3){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::testExtension1();
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.expect
index 44493ddddeb..da5fc4c23e5 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.expect
@@ -30,29 +30,29 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(2){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(3){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::testExtension1();
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.modular.expect
index 44493ddddeb..da5fc4c23e5 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.modular.expect
@@ -30,29 +30,29 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(2){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(3){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::testExtension1();
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.outline.expect
index ef120885172..3fb830a0587 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.outline.expect
@@ -28,21 +28,21 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int
   ;
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num
   ;
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int
   ;
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num
   ;
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.transformed.expect
index a25b507a039..ff1dd59e878 100644
--- a/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/instance_tearoff.dart.weak.transformed.expect
@@ -30,29 +30,29 @@ extension Extension2 on self::Class2 {
   method genericMethod = self::Extension2|genericMethod;
   tearoff genericMethod = self::Extension2|get#genericMethod;
 }
-static method Extension1|method(lowered final self::Class1 #this) → core::int {
+static extension-member method Extension1|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method Extension1|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::Extension1|method(#this);
-static method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
+static extension-member method Extension1|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::Extension1|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::Extension1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension1|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension1|genericMethod<T>(#this, t);
-static method Extension2|method(lowered final self::Class2 #this) → core::int {
+static extension-member method Extension2|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(2){(core::num) → core::int};
 }
-static method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method Extension2|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::Extension2|method(#this);
-static method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
+static extension-member method Extension2|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::Extension2|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::Extension2|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(3){(core::num) → core::num};
 }
-static method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method Extension2|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::Extension2|genericMethod<T>(#this, t);
 static method main() → dynamic {
   self::testExtension1();
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.expect
index a593841a85b..89b62295bd5 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.expect
@@ -16,13 +16,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   return self::_extension#1|get#property2(#this);
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   return #this.{self::Class::field} = value;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   return let final core::int? #t1 = value in let final void #t2 = self::_extension#0|set#property1(#this, #t1) in #t1;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.transformed.expect
index 90eab735305..de89071af3b 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.strong.transformed.expect
@@ -16,13 +16,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   return self::_extension#1|get#property2(#this);
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   return #this.{self::Class::field} = value;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   return let final core::int? #t1 = value in let final void #t2 = self::_extension#0|set#property1(#this, #t1) in #t1;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.expect
index a593841a85b..89b62295bd5 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.expect
@@ -16,13 +16,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   return self::_extension#1|get#property2(#this);
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   return #this.{self::Class::field} = value;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   return let final core::int? #t1 = value in let final void #t2 = self::_extension#0|set#property1(#this, #t1) in #t1;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.modular.expect
index a593841a85b..89b62295bd5 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.modular.expect
@@ -16,13 +16,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   return self::_extension#1|get#property2(#this);
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   return #this.{self::Class::field} = value;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   return let final core::int? #t1 = value in let final void #t2 = self::_extension#0|set#property1(#this, #t1) in #t1;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.outline.expect
index 5fe77a33b36..cba9777fc5e 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.outline.expect
@@ -15,13 +15,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   ;
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   ;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   ;
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.transformed.expect
index 90eab735305..de89071af3b 100644
--- a/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/internal_resolution.dart.weak.transformed.expect
@@ -16,13 +16,13 @@ extension /* unnamed */ _extension#1 on self::Class {
   get property2 = self::_extension#1|get#property2;
   set property2 = self::_extension#1|set#property2;
 }
-static method _extension#0|get#property1(lowered final self::Class #this) → core::int?
+static extension-member method _extension#0|get#property1(lowered final self::Class #this) → core::int?
   return self::_extension#1|get#property2(#this);
-static method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#0|set#property1(lowered final self::Class #this, core::int? value) → void
   return #this.{self::Class::field} = value;
-static method _extension#1|get#property2(lowered final self::Class #this) → core::int?
+static extension-member method _extension#1|get#property2(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
+static extension-member method _extension#1|set#property2(lowered final self::Class #this, core::int? value) → void
   return let final core::int? #t1 = value in let final void #t2 = self::_extension#0|set#property1(#this, #t1) in #t1;
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.expect
index 9736b9dfed3..4fe269a75ee 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.expect
@@ -142,11 +142,11 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.transformed.expect
index 9736b9dfed3..4fe269a75ee 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.strong.transformed.expect
@@ -142,11 +142,11 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.expect
index 9736b9dfed3..4fe269a75ee 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.expect
@@ -142,11 +142,11 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.modular.expect
index 9736b9dfed3..4fe269a75ee 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.modular.expect
@@ -142,11 +142,11 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.outline.expect
index d72d3d54410..d98972bc44f 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.outline.expect
@@ -18,13 +18,13 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic
   ;
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic
   ;
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.transformed.expect
index 9736b9dfed3..4fe269a75ee 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_access.dart.weak.transformed.expect
@@ -142,11 +142,11 @@ extension GenericExtension<T extends core::Object? = dynamic> on self::GenericCl
   method method = self::GenericExtension|method;
   tearoff method = self::GenericExtension|get#method;
 }
-static method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
-static method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this, dynamic a) → dynamic {}
+static extension-member method Extension|get#method(lowered final self::Class #this) → (dynamic) → dynamic
   return (dynamic a) → dynamic => self::Extension|method(#this, a);
-static method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
-static method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
+static extension-member method GenericExtension|method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|method::T%> #this) → dynamic {}
+static extension-member method GenericExtension|get#method<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericExtension|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::GenericExtension|method<self::GenericExtension|get#method::T%>(#this);
 static method main() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.expect
index 5437517b604..d3c5c17f122 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.expect
@@ -58,13 +58,13 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static get Extension|getter() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member get Extension|getter() → dynamic
   return null;
-static set Extension|setter(dynamic _) → void {}
-static get Extension|property() → dynamic
+static extension-member set Extension|setter(dynamic _) → void {}
+static extension-member get Extension|property() → dynamic
   return null;
-static set Extension|property(dynamic _) → void {}
+static extension-member set Extension|property(dynamic _) → void {}
 static method main() → dynamic {}
 static method errors() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.transformed.expect
index 5437517b604..d3c5c17f122 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.strong.transformed.expect
@@ -58,13 +58,13 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static get Extension|getter() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member get Extension|getter() → dynamic
   return null;
-static set Extension|setter(dynamic _) → void {}
-static get Extension|property() → dynamic
+static extension-member set Extension|setter(dynamic _) → void {}
+static extension-member get Extension|property() → dynamic
   return null;
-static set Extension|property(dynamic _) → void {}
+static extension-member set Extension|property(dynamic _) → void {}
 static method main() → dynamic {}
 static method errors() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.expect
index 5437517b604..d3c5c17f122 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.expect
@@ -58,13 +58,13 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static get Extension|getter() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member get Extension|getter() → dynamic
   return null;
-static set Extension|setter(dynamic _) → void {}
-static get Extension|property() → dynamic
+static extension-member set Extension|setter(dynamic _) → void {}
+static extension-member get Extension|property() → dynamic
   return null;
-static set Extension|property(dynamic _) → void {}
+static extension-member set Extension|property(dynamic _) → void {}
 static method main() → dynamic {}
 static method errors() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.modular.expect
index 5437517b604..d3c5c17f122 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.modular.expect
@@ -58,13 +58,13 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static get Extension|getter() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member get Extension|getter() → dynamic
   return null;
-static set Extension|setter(dynamic _) → void {}
-static get Extension|property() → dynamic
+static extension-member set Extension|setter(dynamic _) → void {}
+static extension-member get Extension|property() → dynamic
   return null;
-static set Extension|property(dynamic _) → void {}
+static extension-member set Extension|property(dynamic _) → void {}
 static method main() → dynamic {}
 static method errors() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.outline.expect
index 5d5b38d6455..6cf7506e08b 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.outline.expect
@@ -11,15 +11,15 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic
+static extension-member method Extension|method() → dynamic
   ;
-static get Extension|getter() → dynamic
+static extension-member get Extension|getter() → dynamic
   ;
-static set Extension|setter(dynamic _) → void
+static extension-member set Extension|setter(dynamic _) → void
   ;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   ;
-static set Extension|property(dynamic _) → void
+static extension-member set Extension|property(dynamic _) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.transformed.expect
index 5437517b604..d3c5c17f122 100644
--- a/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/invalid_explicit_static_access.dart.weak.transformed.expect
@@ -58,13 +58,13 @@ extension Extension on core::String {
   static set property = set self::Extension|property;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static get Extension|getter() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member get Extension|getter() → dynamic
   return null;
-static set Extension|setter(dynamic _) → void {}
-static get Extension|property() → dynamic
+static extension-member set Extension|setter(dynamic _) → void {}
+static extension-member get Extension|property() → dynamic
   return null;
-static set Extension|property(dynamic _) → void {}
+static extension-member set Extension|property(dynamic _) → void {}
 static method main() → dynamic {}
 static method errors() → dynamic {
   core::String s = "";
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.strong.expect b/pkg/front_end/testcases/extensions/issue38713.dart.strong.expect
index 8d23b395c52..c8c54861899 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.strong.expect
@@ -27,8 +27,8 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void {}
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member set C|property3(core::int? x) → void {}
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   return 1;
 static method main() → void {
   self::C|property2;
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue38713.dart.strong.transformed.expect
index 8d23b395c52..c8c54861899 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.strong.transformed.expect
@@ -27,8 +27,8 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void {}
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member set C|property3(core::int? x) → void {}
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   return 1;
 static method main() → void {
   self::C|property2;
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.weak.expect b/pkg/front_end/testcases/extensions/issue38713.dart.weak.expect
index 8d23b395c52..c8c54861899 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.weak.expect
@@ -27,8 +27,8 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void {}
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member set C|property3(core::int? x) → void {}
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   return 1;
 static method main() → void {
   self::C|property2;
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue38713.dart.weak.modular.expect
index 8d23b395c52..c8c54861899 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.weak.modular.expect
@@ -27,8 +27,8 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void {}
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member set C|property3(core::int? x) → void {}
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   return 1;
 static method main() → void {
   self::C|property2;
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue38713.dart.weak.outline.expect
index b2af40fea14..fded1d744e5 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.weak.outline.expect
@@ -27,9 +27,9 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void
+static extension-member set C|property3(core::int? x) → void
   ;
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/extensions/issue38713.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue38713.dart.weak.transformed.expect
index 8d23b395c52..c8c54861899 100644
--- a/pkg/front_end/testcases/extensions/issue38713.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38713.dart.weak.transformed.expect
@@ -27,8 +27,8 @@ extension C on core::int {
   static set property3 = set self::C|property3;
 }
 static field core::int? C|property2;
-static set C|property3(core::int? x) → void {}
-static method C|get#property3(lowered final core::int #this) → core::int?
+static extension-member set C|property3(core::int? x) → void {}
+static extension-member method C|get#property3(lowered final core::int #this) → core::int?
   return 1;
 static method main() → void {
   self::C|property2;
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.strong.expect b/pkg/front_end/testcases/extensions/issue38745.dart.strong.expect
index 391575481b3..16fa8e719e3 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.strong.expect
@@ -115,9 +115,9 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property = 42;
 static final field core::int ext|property2 = 42;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
-static set ext|property2(core::int value) → void {}
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
+static extension-member set ext|property2(core::int value) → void {}
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/issue38745.dart:20:5: Error: Undefined name 'field'.
     field;
     ^^^^^";
@@ -135,7 +135,7 @@ static method ext|method<T extends core::Object? = dynamic>(lowered final self::
     property2 = 23;
     ^^^^^^^^^";
 }
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic {}
 static method errors() → dynamic {
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue38745.dart.strong.transformed.expect
index 391575481b3..16fa8e719e3 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.strong.transformed.expect
@@ -115,9 +115,9 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property = 42;
 static final field core::int ext|property2 = 42;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
-static set ext|property2(core::int value) → void {}
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
+static extension-member set ext|property2(core::int value) → void {}
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/issue38745.dart:20:5: Error: Undefined name 'field'.
     field;
     ^^^^^";
@@ -135,7 +135,7 @@ static method ext|method<T extends core::Object? = dynamic>(lowered final self::
     property2 = 23;
     ^^^^^^^^^";
 }
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic {}
 static method errors() → dynamic {
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.weak.expect b/pkg/front_end/testcases/extensions/issue38745.dart.weak.expect
index 391575481b3..16fa8e719e3 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.weak.expect
@@ -115,9 +115,9 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property = 42;
 static final field core::int ext|property2 = 42;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
-static set ext|property2(core::int value) → void {}
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
+static extension-member set ext|property2(core::int value) → void {}
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/issue38745.dart:20:5: Error: Undefined name 'field'.
     field;
     ^^^^^";
@@ -135,7 +135,7 @@ static method ext|method<T extends core::Object? = dynamic>(lowered final self::
     property2 = 23;
     ^^^^^^^^^";
 }
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic {}
 static method errors() → dynamic {
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue38745.dart.weak.modular.expect
index 391575481b3..16fa8e719e3 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.weak.modular.expect
@@ -115,9 +115,9 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property = 42;
 static final field core::int ext|property2 = 42;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
-static set ext|property2(core::int value) → void {}
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
+static extension-member set ext|property2(core::int value) → void {}
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/issue38745.dart:20:5: Error: Undefined name 'field'.
     field;
     ^^^^^";
@@ -135,7 +135,7 @@ static method ext|method<T extends core::Object? = dynamic>(lowered final self::
     property2 = 23;
     ^^^^^^^^^";
 }
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic {}
 static method errors() → dynamic {
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue38745.dart.weak.outline.expect
index c18bfee3032..e612d31f3c0 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.weak.outline.expect
@@ -44,13 +44,13 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property;
 static final field core::int ext|property2;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void
   ;
-static set ext|property2(core::int value) → void
+static extension-member set ext|property2(core::int value) → void
   ;
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic
   ;
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue38745.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue38745.dart.weak.transformed.expect
index 391575481b3..16fa8e719e3 100644
--- a/pkg/front_end/testcases/extensions/issue38745.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38745.dart.weak.transformed.expect
@@ -115,9 +115,9 @@ extension ext<T extends core::Object? = dynamic> on self::C<T%> {
 static field core::int ext|field;
 static final field core::int ext|property = 42;
 static final field core::int ext|property2 = 42;
-static method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
-static set ext|property2(core::int value) → void {}
-static method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
+static extension-member method ext|set#property<T extends core::Object? = dynamic>(lowered final self::C<self::ext|set#property::T%> #this, core::int value) → void {}
+static extension-member set ext|property2(core::int value) → void {}
+static extension-member method ext|method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|method::T%> #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/issue38745.dart:20:5: Error: Undefined name 'field'.
     field;
     ^^^^^";
@@ -135,7 +135,7 @@ static method ext|method<T extends core::Object? = dynamic>(lowered final self::
     property2 = 23;
     ^^^^^^^^^";
 }
-static method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
+static extension-member method ext|get#method<T extends core::Object? = dynamic>(lowered final self::C<self::ext|get#method::T%> #this) → () → dynamic
   return () → dynamic => self::ext|method<self::ext|get#method::T%>(#this);
 static method main() → dynamic {}
 static method errors() → dynamic {
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.strong.expect b/pkg/front_end/testcases/extensions/issue38750.dart.strong.expect
index e3c701126f9..4581853dc83 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.strong.expect
@@ -72,7 +72,7 @@ extension ext on iss::C {
   method _bar = iss::ext|_bar;
   tearoff _bar = iss::ext|get#_bar;
 }
-static method ext|_bar(lowered final iss::C #this) → dynamic {
+static extension-member method ext|_bar(lowered final iss::C #this) → dynamic {
   try {
     throw "producing a stack trace";
   }
@@ -80,7 +80,7 @@ static method ext|_bar(lowered final iss::C #this) → dynamic {
     core::print(s);
   }
 }
-static method ext|get#_bar(lowered final iss::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final iss::C #this) → () → dynamic
   return () → dynamic => iss::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue38750.dart.strong.transformed.expect
index e3c701126f9..4581853dc83 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.strong.transformed.expect
@@ -72,7 +72,7 @@ extension ext on iss::C {
   method _bar = iss::ext|_bar;
   tearoff _bar = iss::ext|get#_bar;
 }
-static method ext|_bar(lowered final iss::C #this) → dynamic {
+static extension-member method ext|_bar(lowered final iss::C #this) → dynamic {
   try {
     throw "producing a stack trace";
   }
@@ -80,7 +80,7 @@ static method ext|_bar(lowered final iss::C #this) → dynamic {
     core::print(s);
   }
 }
-static method ext|get#_bar(lowered final iss::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final iss::C #this) → () → dynamic
   return () → dynamic => iss::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.weak.expect b/pkg/front_end/testcases/extensions/issue38750.dart.weak.expect
index e3c701126f9..4581853dc83 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.weak.expect
@@ -72,7 +72,7 @@ extension ext on iss::C {
   method _bar = iss::ext|_bar;
   tearoff _bar = iss::ext|get#_bar;
 }
-static method ext|_bar(lowered final iss::C #this) → dynamic {
+static extension-member method ext|_bar(lowered final iss::C #this) → dynamic {
   try {
     throw "producing a stack trace";
   }
@@ -80,7 +80,7 @@ static method ext|_bar(lowered final iss::C #this) → dynamic {
     core::print(s);
   }
 }
-static method ext|get#_bar(lowered final iss::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final iss::C #this) → () → dynamic
   return () → dynamic => iss::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue38750.dart.weak.modular.expect
index e3c701126f9..4581853dc83 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.weak.modular.expect
@@ -72,7 +72,7 @@ extension ext on iss::C {
   method _bar = iss::ext|_bar;
   tearoff _bar = iss::ext|get#_bar;
 }
-static method ext|_bar(lowered final iss::C #this) → dynamic {
+static extension-member method ext|_bar(lowered final iss::C #this) → dynamic {
   try {
     throw "producing a stack trace";
   }
@@ -80,7 +80,7 @@ static method ext|_bar(lowered final iss::C #this) → dynamic {
     core::print(s);
   }
 }
-static method ext|get#_bar(lowered final iss::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final iss::C #this) → () → dynamic
   return () → dynamic => iss::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue38750.dart.weak.outline.expect
index e229fa3d08e..7d84ff60123 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.weak.outline.expect
@@ -29,9 +29,9 @@ extension ext on self2::C {
   method _bar = self2::ext|_bar;
   tearoff _bar = self2::ext|get#_bar;
 }
-static method ext|_bar(lowered final self2::C #this) → dynamic
+static extension-member method ext|_bar(lowered final self2::C #this) → dynamic
   ;
-static method ext|get#_bar(lowered final self2::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final self2::C #this) → () → dynamic
   return () → dynamic => self2::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38750.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue38750.dart.weak.transformed.expect
index e3c701126f9..4581853dc83 100644
--- a/pkg/front_end/testcases/extensions/issue38750.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38750.dart.weak.transformed.expect
@@ -72,7 +72,7 @@ extension ext on iss::C {
   method _bar = iss::ext|_bar;
   tearoff _bar = iss::ext|get#_bar;
 }
-static method ext|_bar(lowered final iss::C #this) → dynamic {
+static extension-member method ext|_bar(lowered final iss::C #this) → dynamic {
   try {
     throw "producing a stack trace";
   }
@@ -80,7 +80,7 @@ static method ext|_bar(lowered final iss::C #this) → dynamic {
     core::print(s);
   }
 }
-static method ext|get#_bar(lowered final iss::C #this) → () → dynamic
+static extension-member method ext|get#_bar(lowered final iss::C #this) → () → dynamic
   return () → dynamic => iss::ext|_bar(#this);
 
 library;
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.strong.expect b/pkg/front_end/testcases/extensions/issue38755.dart.strong.expect
index 8ad5a14c684..3cd0ea82aa8 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.strong.expect
@@ -7,10 +7,10 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list = self::A|myMap<core::String, core::String>(<core::String>["a", "b", "c"], (core::String it) → core::String => it);
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
   return #this.{core::Iterable::map}<self::A|myMap::R%>(block){((self::A|myMap::T%) → self::A|myMap::R%) → core::Iterable<self::A|myMap::R%>}.{core::Iterable::toList}(){({growable: core::bool}) → core::List<self::A|myMap::R%>};
 }
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic {
   core::print(self::list);
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue38755.dart.strong.transformed.expect
index 6817f893de3..08c6a2e6eb8 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.strong.transformed.expect
@@ -7,10 +7,10 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list = self::A|myMap<core::String, core::String>(core::_GrowableList::_literal3<core::String>("a", "b", "c"), (core::String it) → core::String => it);
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
   return #this.{core::Iterable::map}<self::A|myMap::R%>(block){((self::A|myMap::T%) → self::A|myMap::R%) → core::Iterable<self::A|myMap::R%>}.{core::Iterable::toList}(){({growable: core::bool}) → core::List<self::A|myMap::R%>};
 }
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic {
   core::print(self::list);
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.weak.expect b/pkg/front_end/testcases/extensions/issue38755.dart.weak.expect
index 8ad5a14c684..3cd0ea82aa8 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.weak.expect
@@ -7,10 +7,10 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list = self::A|myMap<core::String, core::String>(<core::String>["a", "b", "c"], (core::String it) → core::String => it);
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
   return #this.{core::Iterable::map}<self::A|myMap::R%>(block){((self::A|myMap::T%) → self::A|myMap::R%) → core::Iterable<self::A|myMap::R%>}.{core::Iterable::toList}(){({growable: core::bool}) → core::List<self::A|myMap::R%>};
 }
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic {
   core::print(self::list);
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue38755.dart.weak.modular.expect
index 8ad5a14c684..3cd0ea82aa8 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.weak.modular.expect
@@ -7,10 +7,10 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list = self::A|myMap<core::String, core::String>(<core::String>["a", "b", "c"], (core::String it) → core::String => it);
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
   return #this.{core::Iterable::map}<self::A|myMap::R%>(block){((self::A|myMap::T%) → self::A|myMap::R%) → core::Iterable<self::A|myMap::R%>}.{core::Iterable::toList}(){({growable: core::bool}) → core::List<self::A|myMap::R%>};
 }
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic {
   core::print(self::list);
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue38755.dart.weak.outline.expect
index 3827c92974b..b3f22b40bc2 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.weak.outline.expect
@@ -7,9 +7,9 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list;
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%>
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%>
   ;
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue38755.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue38755.dart.weak.transformed.expect
index 6817f893de3..08c6a2e6eb8 100644
--- a/pkg/front_end/testcases/extensions/issue38755.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38755.dart.weak.transformed.expect
@@ -7,10 +7,10 @@ extension A<T extends core::Object? = dynamic> on core::List<T%> {
   tearoff myMap = self::A|get#myMap;
 }
 static final field core::List<core::String> list = self::A|myMap<core::String, core::String>(core::_GrowableList::_literal3<core::String>("a", "b", "c"), (core::String it) → core::String => it);
-static method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
+static extension-member method A|myMap<T extends core::Object? = dynamic, R extends core::Object? = dynamic>(lowered final core::List<self::A|myMap::T%> #this, (self::A|myMap::T%) → self::A|myMap::R% block) → core::List<self::A|myMap::R%> {
   return #this.{core::Iterable::map}<self::A|myMap::R%>(block){((self::A|myMap::T%) → self::A|myMap::R%) → core::Iterable<self::A|myMap::R%>}.{core::Iterable::toList}(){({growable: core::bool}) → core::List<self::A|myMap::R%>};
 }
-static method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
+static extension-member method A|get#myMap<T extends core::Object? = dynamic>(lowered final core::List<self::A|get#myMap::T%> #this) → <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R%) → core::List<R%>
   return <R extends core::Object? = dynamic>((self::A|get#myMap::T%) → R% block) → core::List<R%> => self::A|myMap<self::A|get#myMap::T%, R%>(#this, block);
 static method main() → dynamic {
   core::print(self::list);
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.strong.expect b/pkg/front_end/testcases/extensions/issue38915.dart.strong.expect
index be59970f226..ae1bf6c562d 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.strong.expect
@@ -17,19 +17,19 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
   return null;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
   return null;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue38915.dart.strong.transformed.expect
index be59970f226..ae1bf6c562d 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.strong.transformed.expect
@@ -17,19 +17,19 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
   return null;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
   return null;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.weak.expect b/pkg/front_end/testcases/extensions/issue38915.dart.weak.expect
index be59970f226..ae1bf6c562d 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.weak.expect
@@ -17,19 +17,19 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
   return null;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
   return null;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue38915.dart.weak.modular.expect
index be59970f226..ae1bf6c562d 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.weak.modular.expect
@@ -17,19 +17,19 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
   return null;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
   return null;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue38915.dart.weak.outline.expect
index a0f4a0a1af0..c5c411b9628 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.weak.outline.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {has-declared-initializer core::bool b, has-declared-initializer core::String s}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {has-declared-initializer core::bool b, has-declared-initializer core::String s}) → void
   ;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b, core::String s}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [has-declared-initializer core::bool b, has-declared-initializer core::String s]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [has-declared-initializer core::bool b, has-declared-initializer core::String s]) → void
   ;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b, core::String s]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {has-declared-initializer core::bool b, has-declared-initializer core::String s}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {has-declared-initializer core::bool b, has-declared-initializer core::String s}) → void
   ;
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b, core::String s}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [has-declared-initializer core::bool b, has-declared-initializer core::String s]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [has-declared-initializer core::bool b, has-declared-initializer core::String s]) → void
   ;
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b, core::String s]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue38915.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue38915.dart.weak.transformed.expect
index be59970f226..ae1bf6c562d 100644
--- a/pkg/front_end/testcases/extensions/issue38915.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue38915.dart.weak.transformed.expect
@@ -17,19 +17,19 @@ extension Extension on self::Class {
   method method4 = self::Extension|method4;
   tearoff method4 = self::Extension|get#method4;
 }
-static method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
+static extension-member method Extension|method1(lowered final self::Class #this, {core::bool b = #C1, core::String s = #C2}) → void
   return null;
-static method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
+static extension-member method Extension|get#method1(lowered final self::Class #this) → ({b: core::bool, s: core::String}) → void
   return ({core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method1(#this, b: b, s: s);
-static method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
+static extension-member method Extension|method2(lowered final self::Class #this, [core::bool b = #C1, core::String s = #C2]) → void
   return null;
-static method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
+static extension-member method Extension|get#method2(lowered final self::Class #this) → ([core::bool, core::String]) → void
   return ([core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method2(#this, b, s);
-static method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
-static method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
+static extension-member method Extension|method3(lowered final self::Class #this, core::int i, {core::bool b = #C1, core::String s = #C2}) → void {}
+static extension-member method Extension|get#method3(lowered final self::Class #this) → (core::int, {b: core::bool, s: core::String}) → void
   return (core::int i, {core::bool b = #C1, core::String s = #C2}) → void => self::Extension|method3(#this, i, b: b, s: s);
-static method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
-static method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
+static extension-member method Extension|method4(lowered final self::Class #this, core::int i, [core::bool b = #C1, core::String s = #C2]) → void {}
+static extension-member method Extension|get#method4(lowered final self::Class #this) → (core::int, [core::bool, core::String]) → void
   return (core::int i, [core::bool b = #C1, core::String s = #C2]) → void => self::Extension|method4(#this, i, b, s);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.strong.expect b/pkg/front_end/testcases/extensions/issue39527.dart.strong.expect
index e420a9ed9fa..b6b1f45f272 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.strong.expect
@@ -13,13 +13,13 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   return let final self::C #t1 = #this in block {
     #t1.{self::C::value} = #t1.{self::C::value}{core::int}.{core::num::+}(index.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
   } =>#t1;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   return #this.{self::C::value} = #this.{self::C::value}{core::int}.{core::num::+}(other.{self::C::value}{core::int}.{core::num::+}(index){(core::num) → core::int}.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   return #this;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue39527.dart.strong.transformed.expect
index 51a044f42e0..95af17e65aa 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.strong.transformed.expect
@@ -13,13 +13,13 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   return let final self::C #t1 = #this in block {
     #t1.{self::C::value} = #t1.{self::C::value}{core::int}.{core::num::+}(index.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
   } =>#t1;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   return #this.{self::C::value} = #this.{self::C::value}{core::int}.{core::num::+}(other.{self::C::value}{core::int}.{core::num::+}(index){(core::num) → core::int}.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   return #this;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.weak.expect b/pkg/front_end/testcases/extensions/issue39527.dart.weak.expect
index e420a9ed9fa..b6b1f45f272 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.weak.expect
@@ -13,13 +13,13 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   return let final self::C #t1 = #this in block {
     #t1.{self::C::value} = #t1.{self::C::value}{core::int}.{core::num::+}(index.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
   } =>#t1;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   return #this.{self::C::value} = #this.{self::C::value}{core::int}.{core::num::+}(other.{self::C::value}{core::int}.{core::num::+}(index){(core::num) → core::int}.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   return #this;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue39527.dart.weak.modular.expect
index e420a9ed9fa..b6b1f45f272 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.weak.modular.expect
@@ -13,13 +13,13 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   return let final self::C #t1 = #this in block {
     #t1.{self::C::value} = #t1.{self::C::value}{core::int}.{core::num::+}(index.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
   } =>#t1;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   return #this.{self::C::value} = #this.{self::C::value}{core::int}.{core::num::+}(other.{self::C::value}{core::int}.{core::num::+}(index){(core::num) → core::int}.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   return #this;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue39527.dart.weak.outline.expect
index 363c6d34843..7e37bb0a767 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.weak.outline.expect
@@ -12,11 +12,11 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   ;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   ;
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue39527.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue39527.dart.weak.transformed.expect
index 51a044f42e0..95af17e65aa 100644
--- a/pkg/front_end/testcases/extensions/issue39527.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39527.dart.weak.transformed.expect
@@ -13,13 +13,13 @@ extension Extension1 on self::C {
   operator []= = self::Extension1|[]=;
   operator - = self::Extension1|-;
 }
-static method Extension1|[](lowered final self::C #this, core::int index) → self::C
+static extension-member method Extension1|[](lowered final self::C #this, core::int index) → self::C
   return let final self::C #t1 = #this in block {
     #t1.{self::C::value} = #t1.{self::C::value}{core::int}.{core::num::+}(index.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
   } =>#t1;
-static method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
+static extension-member method Extension1|[]=(lowered final self::C #this, core::int index, self::C other) → void
   return #this.{self::C::value} = #this.{self::C::value}{core::int}.{core::num::+}(other.{self::C::value}{core::int}.{core::num::+}(index){(core::num) → core::int}.{core::num::+}(1){(core::num) → core::int}){(core::num) → core::int};
-static method Extension1|-(lowered final self::C #this, core::int val) → self::C
+static extension-member method Extension1|-(lowered final self::C #this, core::int val) → self::C
   return #this;
 static method main() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.strong.expect b/pkg/front_end/testcases/extensions/issue39889.dart.strong.expect
index 58e0bae4653..0a199a72c0c 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.strong.expect
@@ -11,8 +11,8 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void {}
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void {}
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void {
   dynamic b = "456";
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue39889.dart.strong.transformed.expect
index 58e0bae4653..0a199a72c0c 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.strong.transformed.expect
@@ -11,8 +11,8 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void {}
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void {}
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void {
   dynamic b = "456";
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.weak.expect b/pkg/front_end/testcases/extensions/issue39889.dart.weak.expect
index 58e0bae4653..0a199a72c0c 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.weak.expect
@@ -11,8 +11,8 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void {}
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void {}
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void {
   dynamic b = "456";
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue39889.dart.weak.modular.expect
index 58e0bae4653..0a199a72c0c 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.weak.modular.expect
@@ -11,8 +11,8 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void {}
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void {}
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void {
   dynamic b = "456";
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue39889.dart.weak.outline.expect
index f3ae671913e..29869a5cee2 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void
   ;
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/extensions/issue39889.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue39889.dart.weak.transformed.expect
index 58e0bae4653..0a199a72c0c 100644
--- a/pkg/front_end/testcases/extensions/issue39889.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39889.dart.weak.transformed.expect
@@ -11,8 +11,8 @@ extension E on self::C {
   method f = self::E|f;
   tearoff f = self::E|get#f;
 }
-static method E|f(lowered final self::C #this, core::String b) → void {}
-static method E|get#f(lowered final self::C #this) → (core::String) → void
+static extension-member method E|f(lowered final self::C #this, core::String b) → void {}
+static extension-member method E|get#f(lowered final self::C #this) → (core::String) → void
   return (core::String b) → void => self::E|f(#this, b);
 static method main() → void {
   dynamic b = "456";
diff --git a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.expect b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.expect
index 17e789cc1fc..b5cc684db2c 100644
--- a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.expect
@@ -27,5 +27,5 @@ import "dart:core" as core;
 extension Extension on core::bool {
   operator + = iss::Extension|+;
 }
-static method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
+static extension-member method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
   return #this.{core::bool::|}(other){(core::bool) → core::bool};
diff --git a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.transformed.expect
index 17e789cc1fc..b5cc684db2c 100644
--- a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.strong.transformed.expect
@@ -27,5 +27,5 @@ import "dart:core" as core;
 extension Extension on core::bool {
   operator + = iss::Extension|+;
 }
-static method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
+static extension-member method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
   return #this.{core::bool::|}(other){(core::bool) → core::bool};
diff --git a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.expect b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.expect
index 17e789cc1fc..b5cc684db2c 100644
--- a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.expect
@@ -27,5 +27,5 @@ import "dart:core" as core;
 extension Extension on core::bool {
   operator + = iss::Extension|+;
 }
-static method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
+static extension-member method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
   return #this.{core::bool::|}(other){(core::bool) → core::bool};
diff --git a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.outline.expect
index c59592bf9a2..e9004c45cc9 100644
--- a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.outline.expect
@@ -15,5 +15,5 @@ import "dart:core" as core;
 extension Extension on core::bool {
   operator + = self2::Extension|+;
 }
-static method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
+static extension-member method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
   ;
diff --git a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.transformed.expect
index 17e789cc1fc..b5cc684db2c 100644
--- a/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue39938/issue39938.dart.weak.transformed.expect
@@ -27,5 +27,5 @@ import "dart:core" as core;
 extension Extension on core::bool {
   operator + = iss::Extension|+;
 }
-static method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
+static extension-member method Extension|+(lowered final core::bool #this, core::bool other) → core::bool
   return #this.{core::bool::|}(other){(core::bool) → core::bool};
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.strong.expect b/pkg/front_end/testcases/extensions/issue40596.dart.strong.expect
index 58a765551da..87ebe5af4b7 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.strong.expect
@@ -15,10 +15,10 @@ static method main() → void {
     core::print(s);
   });
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
   return #this.{asy::Stream::listen}((self::Extension|call::T% d) → void {
     onData(d);
   }){((self::Extension|call::T%) →? void, {cancelOnError: core::bool?, onDone: () →? void, onError: core::Function?}) → asy::StreamSubscription<self::Extension|call::T%>};
 }
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue40596.dart.strong.transformed.expect
index 58a765551da..87ebe5af4b7 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.strong.transformed.expect
@@ -15,10 +15,10 @@ static method main() → void {
     core::print(s);
   });
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
   return #this.{asy::Stream::listen}((self::Extension|call::T% d) → void {
     onData(d);
   }){((self::Extension|call::T%) →? void, {cancelOnError: core::bool?, onDone: () →? void, onError: core::Function?}) → asy::StreamSubscription<self::Extension|call::T%>};
 }
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.weak.expect b/pkg/front_end/testcases/extensions/issue40596.dart.weak.expect
index 58a765551da..87ebe5af4b7 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.weak.expect
@@ -15,10 +15,10 @@ static method main() → void {
     core::print(s);
   });
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
   return #this.{asy::Stream::listen}((self::Extension|call::T% d) → void {
     onData(d);
   }){((self::Extension|call::T%) →? void, {cancelOnError: core::bool?, onDone: () →? void, onError: core::Function?}) → asy::StreamSubscription<self::Extension|call::T%>};
 }
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue40596.dart.weak.modular.expect
index 58a765551da..87ebe5af4b7 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.weak.modular.expect
@@ -15,10 +15,10 @@ static method main() → void {
     core::print(s);
   });
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
   return #this.{asy::Stream::listen}((self::Extension|call::T% d) → void {
     onData(d);
   }){((self::Extension|call::T%) →? void, {cancelOnError: core::bool?, onDone: () →? void, onError: core::Function?}) → asy::StreamSubscription<self::Extension|call::T%>};
 }
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue40596.dart.weak.outline.expect
index 1b58ca31d70..e4678a94cb3 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.weak.outline.expect
@@ -11,7 +11,7 @@ extension Extension<T extends core::Object? = dynamic> on asy::Stream<T%> {
 }
 static method main() → void
   ;
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%>
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%>
   ;
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40596.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue40596.dart.weak.transformed.expect
index 58a765551da..87ebe5af4b7 100644
--- a/pkg/front_end/testcases/extensions/issue40596.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40596.dart.weak.transformed.expect
@@ -15,10 +15,10 @@ static method main() → void {
     core::print(s);
   });
 }
-static method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
+static extension-member method Extension|call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|call::T%> #this, core::Function onData) → asy::StreamSubscription<self::Extension|call::T%> {
   return #this.{asy::Stream::listen}((self::Extension|call::T% d) → void {
     onData(d);
   }){((self::Extension|call::T%) →? void, {cancelOnError: core::bool?, onDone: () →? void, onError: core::Function?}) → asy::StreamSubscription<self::Extension|call::T%>};
 }
-static method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
+static extension-member method Extension|get#call<T extends core::Object? = dynamic>(lowered final asy::Stream<self::Extension|get#call::T%> #this) → (core::Function) → asy::StreamSubscription<self::Extension|get#call::T%>
   return (core::Function onData) → asy::StreamSubscription<self::Extension|get#call::T%> => self::Extension|call<self::Extension|get#call::T%>(#this, onData);
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.strong.expect b/pkg/front_end/testcases/extensions/issue40713.dart.strong.expect
index 5ee96498b76..5f58eace317 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.strong.expect
@@ -20,7 +20,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
   return #this.{core::Iterable::isNotEmpty}{core::bool*} ?{self::SafeAccess|get#safeFirst::T*} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T*} : null;
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue40713.dart.strong.transformed.expect
index 99dd558213f..4d7a38d60ea 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.strong.transformed.expect
@@ -20,7 +20,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
   return #this.{core::Iterable::isNotEmpty}{core::bool*} ?{self::SafeAccess|get#safeFirst::T*} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T*} : null;
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.weak.expect b/pkg/front_end/testcases/extensions/issue40713.dart.weak.expect
index 069e0ea267f..0dcfebdf22b 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.weak.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
   return #this.{core::Iterable::isNotEmpty}{core::bool*} ?{self::SafeAccess|get#safeFirst::T*} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T*} : null;
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue40713.dart.weak.modular.expect
index 069e0ea267f..0dcfebdf22b 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.weak.modular.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
   return #this.{core::Iterable::isNotEmpty}{core::bool*} ?{self::SafeAccess|get#safeFirst::T*} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T*} : null;
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue40713.dart.weak.outline.expect
index a1906195dc7..59727c3fe52 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T*
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T*
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue40713.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue40713.dart.weak.transformed.expect
index dedf240ca84..f7f020ea92e 100644
--- a/pkg/front_end/testcases/extensions/issue40713.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40713.dart.weak.transformed.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object* = dynamic> on core::Iterable<T*>* {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object* = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T*>* #this) → self::SafeAccess|get#safeFirst::T* {
   return #this.{core::Iterable::isNotEmpty}{core::bool*} ?{self::SafeAccess|get#safeFirst::T*} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T*} : null;
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.expect
index ab9864e3943..1a96d67e68c 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
   return #this.{core::Iterable::isNotEmpty}{core::bool} ?{self::SafeAccess|get#safeFirst::T%} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T%} : throw "";
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.transformed.expect
index e955e07183c..1ed1929c309 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.strong.transformed.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
   return #this.{core::Iterable::isNotEmpty}{core::bool} ?{self::SafeAccess|get#safeFirst::T%} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T%} : throw "";
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.expect
index ab9864e3943..1a96d67e68c 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
   return #this.{core::Iterable::isNotEmpty}{core::bool} ?{self::SafeAccess|get#safeFirst::T%} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T%} : throw "";
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.modular.expect
index ab9864e3943..1a96d67e68c 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.modular.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
   return #this.{core::Iterable::isNotEmpty}{core::bool} ?{self::SafeAccess|get#safeFirst::T%} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T%} : throw "";
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.outline.expect
index 9ae7e5b7d22..cfcc6e19fd6 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T%
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T%
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.transformed.expect
index e955e07183c..1ed1929c309 100644
--- a/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40713_2.dart.weak.transformed.expect
@@ -16,7 +16,7 @@ import "dart:core" as core;
 extension SafeAccess<T extends core::Object? = dynamic> on core::Iterable<T%> {
   get safeFirst = self::SafeAccess|get#safeFirst;
 }
-static method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
+static extension-member method SafeAccess|get#safeFirst<T extends core::Object? = dynamic>(lowered final core::Iterable<self::SafeAccess|get#safeFirst::T%> #this) → self::SafeAccess|get#safeFirst::T% {
   return #this.{core::Iterable::isNotEmpty}{core::bool} ?{self::SafeAccess|get#safeFirst::T%} #this.{core::Iterable::first}{self::SafeAccess|get#safeFirst::T%} : throw "";
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.strong.expect b/pkg/front_end/testcases/extensions/issue40816.dart.strong.expect
index 67d4347c9ad..6efb394eb2e 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.strong.expect
@@ -16,8 +16,8 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void {
   dynamic a = new self::A::•();
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue40816.dart.strong.transformed.expect
index 67d4347c9ad..6efb394eb2e 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.strong.transformed.expect
@@ -16,8 +16,8 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void {
   dynamic a = new self::A::•();
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.weak.expect b/pkg/front_end/testcases/extensions/issue40816.dart.weak.expect
index 67d4347c9ad..6efb394eb2e 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.weak.expect
@@ -16,8 +16,8 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void {
   dynamic a = new self::A::•();
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue40816.dart.weak.modular.expect
index 67d4347c9ad..6efb394eb2e 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.weak.modular.expect
@@ -16,8 +16,8 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void {
   dynamic a = new self::A::•();
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue40816.dart.weak.outline.expect
index 10d01daaf74..10e60e982a9 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.weak.outline.expect
@@ -14,9 +14,9 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void
   ;
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/extensions/issue40816.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue40816.dart.weak.transformed.expect
index 67d4347c9ad..6efb394eb2e 100644
--- a/pkg/front_end/testcases/extensions/issue40816.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue40816.dart.weak.transformed.expect
@@ -16,8 +16,8 @@ extension /* unnamed */ _extension#0 on self::A {
   method foo = self::_extension#0|foo;
   tearoff foo = self::_extension#0|get#foo;
 }
-static method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
-static method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
+static extension-member method _extension#0|foo(lowered final self::A #this, self::A a, self::B b) → void {}
+static extension-member method _extension#0|get#foo(lowered final self::A #this) → (self::A, self::B) → void
   return (self::A a, self::B b) → void => self::_extension#0|foo(#this, a, b);
 static method main() → void {
   dynamic a = new self::A::•();
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.strong.expect b/pkg/front_end/testcases/extensions/issue43218.dart.strong.expect
index 6ca7c9027c6..fdccac1a4f8 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.strong.expect
@@ -26,7 +26,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   return #this.{self::C::value}{core::int}.{core::num::+}(1){(core::num) → core::int};
 static method test() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue43218.dart.strong.transformed.expect
index 6ca7c9027c6..fdccac1a4f8 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.strong.transformed.expect
@@ -26,7 +26,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   return #this.{self::C::value}{core::int}.{core::num::+}(1){(core::num) → core::int};
 static method test() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.weak.expect b/pkg/front_end/testcases/extensions/issue43218.dart.weak.expect
index 6ca7c9027c6..fdccac1a4f8 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.weak.expect
@@ -26,7 +26,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   return #this.{self::C::value}{core::int}.{core::num::+}(1){(core::num) → core::int};
 static method test() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue43218.dart.weak.modular.expect
index 6ca7c9027c6..fdccac1a4f8 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.weak.modular.expect
@@ -26,7 +26,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   return #this.{self::C::value}{core::int}.{core::num::+}(1){(core::num) → core::int};
 static method test() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue43218.dart.weak.outline.expect
index b693515923e..b831b258e0a 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.weak.outline.expect
@@ -16,7 +16,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   ;
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue43218.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue43218.dart.weak.transformed.expect
index 6ca7c9027c6..fdccac1a4f8 100644
--- a/pkg/front_end/testcases/extensions/issue43218.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue43218.dart.weak.transformed.expect
@@ -26,7 +26,7 @@ class C extends core::Object {
 extension Ext on self::C {
   get id = self::Ext|get#id;
 }
-static method Ext|get#id(lowered final self::C #this) → core::int
+static extension-member method Ext|get#id(lowered final self::C #this) → core::int
   return #this.{self::C::value}{core::int}.{core::num::+}(1){(core::num) → core::int};
 static method test() → dynamic {
   self::C c = new self::C::•();
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.strong.expect b/pkg/front_end/testcases/extensions/issue44003.dart.strong.expect
index 534780e64f6..5e45396990a 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.strong.expect
@@ -29,9 +29,9 @@ Try correcting the name to the name of an existing method, or defining a method
   args.foo('1', 2);
        ^^^" in args{<unresolved>}.foo("1", 2);
 }
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
   core::print(1);
 }
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/issue44003.dart.strong.transformed.expect
index 534780e64f6..5e45396990a 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.strong.transformed.expect
@@ -29,9 +29,9 @@ Try correcting the name to the name of an existing method, or defining a method
   args.foo('1', 2);
        ^^^" in args{<unresolved>}.foo("1", 2);
 }
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
   core::print(1);
 }
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.weak.expect b/pkg/front_end/testcases/extensions/issue44003.dart.weak.expect
index 534780e64f6..5e45396990a 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.weak.expect
@@ -29,9 +29,9 @@ Try correcting the name to the name of an existing method, or defining a method
   args.foo('1', 2);
        ^^^" in args{<unresolved>}.foo("1", 2);
 }
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
   core::print(1);
 }
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/issue44003.dart.weak.modular.expect
index 534780e64f6..5e45396990a 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.weak.modular.expect
@@ -29,9 +29,9 @@ Try correcting the name to the name of an existing method, or defining a method
   args.foo('1', 2);
        ^^^" in args{<unresolved>}.foo("1", 2);
 }
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
   core::print(1);
 }
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/issue44003.dart.weak.outline.expect
index bdde702cf6c..dd7cb0149da 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.weak.outline.expect
@@ -18,9 +18,9 @@ extension /* unnamed */ _extension#0 on core::List<core::String> {
 }
 static method test(core::List<core::String> args) → void
   ;
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void
   ;
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/issue44003.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/issue44003.dart.weak.transformed.expect
index 534780e64f6..5e45396990a 100644
--- a/pkg/front_end/testcases/extensions/issue44003.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/issue44003.dart.weak.transformed.expect
@@ -29,9 +29,9 @@ Try correcting the name to the name of an existing method, or defining a method
   args.foo('1', 2);
        ^^^" in args{<unresolved>}.foo("1", 2);
 }
-static method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
+static extension-member method _extension#0|foo(lowered final core::List<core::String> #this, core::String bar) → void {
   core::print(1);
 }
-static method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
+static extension-member method _extension#0|get#foo(lowered final core::List<core::String> #this) → (core::String) → void
   return (core::String bar) → void => self::_extension#0|foo(#this, bar);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.expect
index dc068d3b0dc..79659ab7282 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.expect
@@ -36,6 +36,6 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   return (self::Test|get#test::T* a) → self::Test|get#test::T* => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.transformed.expect
index dc068d3b0dc..79659ab7282 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.strong.transformed.expect
@@ -36,6 +36,6 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   return (self::Test|get#test::T* a) → self::Test|get#test::T* => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.expect
index d56ceedf98b..b0810407d52 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.expect
@@ -32,6 +32,6 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   return (self::Test|get#test::T* a) → self::Test|get#test::T* => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.modular.expect
index d56ceedf98b..b0810407d52 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.modular.expect
@@ -32,6 +32,6 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   return (self::Test|get#test::T* a) → self::Test|get#test::T* => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.outline.expect
index 5d954b7fa7d..8eceb3f9b82 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.outline.expect
@@ -21,7 +21,7 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.transformed.expect
index d56ceedf98b..b0810407d52 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182.dart.weak.transformed.expect
@@ -32,6 +32,6 @@ class Foo<S extends core::num*> extends core::Object {
 extension Test<T extends core::Object* = dynamic> on T* {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
+static extension-member method Test|get#test<T extends core::Object* = dynamic>(lowered final self::Test|get#test::T* #this) → (self::Test|get#test::T*) →* self::Test|get#test::T*
   return (self::Test|get#test::T* a) → self::Test|get#test::T* => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.transformed.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.strong.transformed.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.modular.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.modular.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.outline.expect
index 6071eb7658e..6d4cea4be91 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.outline.expect
@@ -11,7 +11,7 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.transformed.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/language_issue1182_2.dart.weak.transformed.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.expect
index 224eb96111a..8f09934449c 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.expect
@@ -25,5 +25,5 @@ static field dynamic missingGetter = let final self::Class #t1 = self::c in let
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'setter'.
 var missingGetter = c.setter += 42;
                       ^^^^^^" in #t1{<unresolved>}.setter{dynamic}.+(42) as{TypeError,ForDynamic} core::int in let final void #t3 = self::Extension|set#setter(#t1, #t2) in #t2;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.transformed.expect
index 1ce59c2383b..3dfee0e1d98 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.strong.transformed.expect
@@ -25,5 +25,5 @@ static field dynamic missingGetter = let final self::Class #t1 = self::c in let
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'setter'.
 var missingGetter = c.setter += 42;
                       ^^^^^^" in #t1{<unresolved>}.setter{dynamic}.+(42) as{TypeError,ForDynamic} core::int in let final void #t3 = self::Extension|set#setter(#t1, #t2) in #t2;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.expect
index 224eb96111a..8f09934449c 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.expect
@@ -25,5 +25,5 @@ static field dynamic missingGetter = let final self::Class #t1 = self::c in let
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'setter'.
 var missingGetter = c.setter += 42;
                       ^^^^^^" in #t1{<unresolved>}.setter{dynamic}.+(42) as{TypeError,ForDynamic} core::int in let final void #t3 = self::Extension|set#setter(#t1, #t2) in #t2;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.modular.expect
index 224eb96111a..8f09934449c 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.modular.expect
@@ -25,5 +25,5 @@ static field dynamic missingGetter = let final self::Class #t1 = self::c in let
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'setter'.
 var missingGetter = c.setter += 42;
                       ^^^^^^" in #t1{<unresolved>}.setter{dynamic}.+(42) as{TypeError,ForDynamic} core::int in let final void #t3 = self::Extension|set#setter(#t1, #t2) in #t2;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.outline.expect
index ebb28e3ebf7..9971d7c64e0 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.outline.expect
@@ -20,7 +20,7 @@ extension Extension on self::Class {
 }
 static field self::Class c;
 static field dynamic missingGetter;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.transformed.expect
index 1ce59c2383b..3dfee0e1d98 100644
--- a/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/missing_toplevel.dart.weak.transformed.expect
@@ -25,5 +25,5 @@ static field dynamic missingGetter = let final self::Class #t1 = self::c in let
 Try correcting the name to the name of an existing getter, or defining a getter or field named 'setter'.
 var missingGetter = c.setter += 42;
                       ^^^^^^" in #t1{<unresolved>}.setter{dynamic}.+(42) as{TypeError,ForDynamic} core::int in let final void #t3 = self::Extension|set#setter(#t1, #t2) in #t2;
-static method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|set#setter(lowered final self::Class #this, core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.strong.expect b/pkg/front_end/testcases/extensions/multi_export.dart.strong.expect
index d4cf29f8129..1711241d964 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.strong.expect
@@ -93,6 +93,6 @@ extension Extension<T extends mul2::Class> on T {
   method method = mul2::Extension|method;
   tearoff method = mul2::Extension|get#method;
 }
-static method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
-static method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
+static extension-member method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul2::Extension|method<mul2::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/multi_export.dart.strong.transformed.expect
index d4cf29f8129..1711241d964 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.strong.transformed.expect
@@ -93,6 +93,6 @@ extension Extension<T extends mul2::Class> on T {
   method method = mul2::Extension|method;
   tearoff method = mul2::Extension|get#method;
 }
-static method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
-static method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
+static extension-member method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul2::Extension|method<mul2::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.weak.expect b/pkg/front_end/testcases/extensions/multi_export.dart.weak.expect
index d4cf29f8129..1711241d964 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.weak.expect
@@ -93,6 +93,6 @@ extension Extension<T extends mul2::Class> on T {
   method method = mul2::Extension|method;
   tearoff method = mul2::Extension|get#method;
 }
-static method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
-static method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
+static extension-member method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul2::Extension|method<mul2::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/multi_export.dart.weak.modular.expect
index d4cf29f8129..1711241d964 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.weak.modular.expect
@@ -93,6 +93,6 @@ extension Extension<T extends mul2::Class> on T {
   method method = mul2::Extension|method;
   tearoff method = mul2::Extension|get#method;
 }
-static method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
-static method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
+static extension-member method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul2::Extension|method<mul2::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/multi_export.dart.weak.outline.expect
index 5fe57f11deb..a810bd781a3 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.weak.outline.expect
@@ -71,7 +71,7 @@ extension Extension<T extends mul::Class> on T {
   method method = mul::Extension|method;
   tearoff method = mul::Extension|get#method;
 }
-static method Extension|method<T extends mul::Class>(lowered final mul::Extension|method::T #this) → dynamic
+static extension-member method Extension|method<T extends mul::Class>(lowered final mul::Extension|method::T #this) → dynamic
   ;
-static method Extension|get#method<T extends mul::Class>(lowered final mul::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|get#method<T extends mul::Class>(lowered final mul::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul::Extension|method<mul::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/multi_export.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/multi_export.dart.weak.transformed.expect
index d4cf29f8129..1711241d964 100644
--- a/pkg/front_end/testcases/extensions/multi_export.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/multi_export.dart.weak.transformed.expect
@@ -93,6 +93,6 @@ extension Extension<T extends mul2::Class> on T {
   method method = mul2::Extension|method;
   tearoff method = mul2::Extension|get#method;
 }
-static method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
-static method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
+static extension-member method Extension|method<T extends mul2::Class>(lowered final mul2::Extension|method::T #this) → dynamic {}
+static extension-member method Extension|get#method<T extends mul2::Class>(lowered final mul2::Extension|get#method::T #this) → () → dynamic
   return () → dynamic => mul2::Extension|method<mul2::Extension|get#method::T>(#this);
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.expect
index b9c74d71348..f24cd5200fc 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.expect
@@ -13,10 +13,10 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.transformed.expect
index b9c74d71348..f24cd5200fc 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.strong.transformed.expect
@@ -13,10 +13,10 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.expect
index b9c74d71348..f24cd5200fc 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.expect
@@ -13,10 +13,10 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.modular.expect
index b9c74d71348..f24cd5200fc 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.modular.expect
@@ -13,10 +13,10 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.outline.expect
index d62beaf7028..6ee8fee467f 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.outline.expect
@@ -12,13 +12,13 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic
   ;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic
   ;
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.transformed.expect
index b9c74d71348..f24cd5200fc 100644
--- a/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/nested_on_types.dart.weak.transformed.expect
@@ -13,10 +13,10 @@ extension Extension<T extends core::Object? = dynamic> on self::A<self::A<T%>> {
   method method2 = self::Extension|method2;
   tearoff method2 = self::Extension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method1::T%>> #this) → dynamic {}
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method1::T%>> #this) → () → dynamic
   return () → dynamic => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
-static method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
+static extension-member method Extension|method2<T extends core::Object? = dynamic, A extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|method2::T%>> #this, self::Extension|method2::A% a) → dynamic {}
+static extension-member method Extension|get#method2<T extends core::Object? = dynamic>(lowered final self::A<self::A<self::Extension|get#method2::T%>> #this) → <A extends core::Object? = dynamic>(A%) → dynamic
   return <A extends core::Object? = dynamic>(A% a) → dynamic => self::Extension|method2<self::Extension|get#method2::T%, A%>(#this, a);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.strong.expect b/pkg/front_end/testcases/extensions/null_aware.dart.strong.expect
index 420d8e2a202..089ea2569dc 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.strong.expect
@@ -33,21 +33,21 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int* #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int*} let final core::int* #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1);
   self::expect(42, let final core::int* #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int*} let final core::int* #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4);
 }
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/null_aware.dart.strong.transformed.expect
index 357bc8b85c6..7d244b08f61 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.strong.transformed.expect
@@ -33,21 +33,21 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int* #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int*} let final core::int* #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1);
   self::expect(42, let final core::int* #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int*} let final core::int* #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4);
 }
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.weak.expect b/pkg/front_end/testcases/extensions/null_aware.dart.weak.expect
index 72c8da0f556..9684dfb16e7 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.weak.expect
@@ -26,21 +26,21 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int* #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int*} let final core::int* #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1);
   self::expect(42, let final core::int* #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int*} let final core::int* #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4);
 }
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/null_aware.dart.weak.modular.expect
index 72c8da0f556..9684dfb16e7 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.weak.modular.expect
@@ -26,21 +26,21 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int* #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int*} let final core::int* #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1);
   self::expect(42, let final core::int* #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int*} let final core::int* #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4);
 }
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/null_aware.dart.weak.outline.expect
index 0136676a065..9e8a0a6d1be 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.weak.outline.expect
@@ -25,17 +25,17 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void
   ;
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   ;
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic
   ;
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/null_aware.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/null_aware.dart.weak.transformed.expect
index 3fb4c93434f..39152fe2b2a 100644
--- a/pkg/front_end/testcases/extensions/null_aware.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware.dart.weak.transformed.expect
@@ -26,21 +26,21 @@ extension Extension on self::Class* {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|get#property(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
+static extension-member method Extension|set#property(lowered final self::Class* #this, core::int* value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → core::int*
+static extension-member method Extension|method(lowered final self::Class* #this) → core::int*
   return #this.{self::Class::field}{core::int*};
-static method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* core::int*
   return () → core::int* => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class* #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int* #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int*} let final core::int* #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1);
   self::expect(42, let final core::int* #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int*} let final core::int* #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4);
 }
-static method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::Class* c;
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.strong.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.strong.expect
index 3b83f83d8a6..4e58e37d7c0 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.strong.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int? #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int} let final core::int #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1{core::int});
   self::expect(42, let final core::int? #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int} let final core::int #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4{core::int});
 }
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::test1(null);
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.strong.transformed.expect
index cac4bb1cfc2..6f2067bfdc1 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.strong.transformed.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int? #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int} let final core::int #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1{core::int});
   self::expect(42, let final core::int? #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int} let final core::int #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4{core::int});
 }
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::test1(null);
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.expect
index 3b83f83d8a6..4e58e37d7c0 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int? #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int} let final core::int #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1{core::int});
   self::expect(42, let final core::int? #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int} let final core::int #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4{core::int});
 }
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::test1(null);
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.modular.expect
index 3b83f83d8a6..4e58e37d7c0 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.modular.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int? #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int} let final core::int #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1{core::int});
   self::expect(42, let final core::int? #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int} let final core::int #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4{core::int});
 }
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::test1(null);
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.outline.expect
index f450260b577..fe381f84ffa 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.outline.expect
@@ -15,17 +15,17 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   ;
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void
   ;
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   ;
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.transformed.expect
index cac4bb1cfc2..6f2067bfdc1 100644
--- a/pkg/front_end/testcases/extensions/null_aware2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware2.dart.weak.transformed.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   tearoff testImplicitThis = self::Extension|get#testImplicitThis;
   set property = self::Extension|set#property;
 }
-static method Extension|get#property(lowered final self::Class #this) → core::int?
+static extension-member method Extension|get#property(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
+static extension-member method Extension|set#property(lowered final self::Class #this, core::int? value) → void {
   #this.{self::Class::field} = value;
 }
-static method Extension|method(lowered final self::Class #this) → core::int?
+static extension-member method Extension|method(lowered final self::Class #this) → core::int?
   return #this.{self::Class::field}{core::int?};
-static method Extension|get#method(lowered final self::Class #this) → () → core::int?
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → core::int?
   return () → core::int? => self::Extension|method(#this);
-static method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|testImplicitThis(lowered final self::Class #this) → dynamic {
   self::expect(null, self::Extension|get#property(#this));
   self::expect(42, let final core::int? #t1 = self::Extension|get#property(#this) in #t1 == null ?{core::int} let final core::int #t2 = 42 in let final void #t3 = self::Extension|set#property(#this, #t2) in #t2 : #t1{core::int});
   self::expect(42, let final core::int? #t4 = self::Extension|get#property(#this) in #t4 == null ?{core::int} let final core::int #t5 = 87 in let final void #t6 = self::Extension|set#property(#this, #t5) in #t5 : #t4{core::int});
 }
-static method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#testImplicitThis(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|testImplicitThis(#this);
 static method main() → dynamic {
   self::test1(null);
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.expect
index d5eb5cc1614..8bb8f154283 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
 static method fun(core::String? s) → void {
   let final core::String? #t1 = s in #t1 == null ?{void} null : self::Foo|set#f(#t1{core::String}, 1);
 }
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.transformed.expect
index d5eb5cc1614..8bb8f154283 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.strong.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
 static method fun(core::String? s) → void {
   let final core::String? #t1 = s in #t1 == null ?{void} null : self::Foo|set#f(#t1{core::String}, 1);
 }
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.expect
index d5eb5cc1614..8bb8f154283 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
 static method fun(core::String? s) → void {
   let final core::String? #t1 = s in #t1 == null ?{void} null : self::Foo|set#f(#t1{core::String}, 1);
 }
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.modular.expect
index d5eb5cc1614..8bb8f154283 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.modular.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
 static method fun(core::String? s) → void {
   let final core::String? #t1 = s in #t1 == null ?{void} null : self::Foo|set#f(#t1{core::String}, 1);
 }
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.outline.expect
index 0f01278992a..1f0c5928b6c 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void
   ;
 static method fun(core::String? s) → void
   ;
diff --git a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.transformed.expect
index d5eb5cc1614..8bb8f154283 100644
--- a/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/null_aware_set.dart.weak.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Foo on core::Object {
   set f = self::Foo|set#f;
 }
-static method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
+static extension-member method Foo|set#f(lowered final core::Object #this, core::int x) → void {}
 static method fun(core::String? s) → void {
   let final core::String? #t1 = s in #t1 == null ?{void} null : self::Foo|set#f(#t1{core::String}, 1);
 }
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.strong.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.strong.expect
index b22ca2d6635..330f1c36442 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.strong.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   return 42;
 static method test(self::Class? c) → void {
   self::_extension#0|get#property(c);
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.strong.transformed.expect
index b22ca2d6635..330f1c36442 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.strong.transformed.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   return 42;
 static method test(self::Class? c) → void {
   self::_extension#0|get#property(c);
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.expect
index b22ca2d6635..330f1c36442 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   return 42;
 static method test(self::Class? c) → void {
   self::_extension#0|get#property(c);
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.modular.expect
index b22ca2d6635..330f1c36442 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.modular.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   return 42;
 static method test(self::Class? c) → void {
   self::_extension#0|get#property(c);
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.outline.expect
index e62ebdba4f3..3653bfdf3b8 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.outline.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   ;
 static method test(self::Class? c) → void
   ;
diff --git a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.transformed.expect
index b22ca2d6635..330f1c36442 100644
--- a/pkg/front_end/testcases/extensions/nullable_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/nullable_access.dart.weak.transformed.expect
@@ -13,7 +13,7 @@ class Class extends core::Object {
 extension /* unnamed */ _extension#0 on self::Class? {
   get property = self::_extension#0|get#property;
 }
-static method _extension#0|get#property(lowered final self::Class? #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class? #this) → core::int
   return 42;
 static method test(self::Class? c) → void {
   self::_extension#0|get#property(c);
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.strong.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.strong.expect
index 7b60d1bd62b..d43784c0a3f 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.strong.expect
@@ -19,11 +19,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   return self::_extension#0|get#returnType::R%;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   return self::_extension#0|get#parameterType::T%;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   return self::_extension#1|get#parameterType::T;
 static method main() → dynamic {
   function local1(core::int i) → core::int
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.strong.transformed.expect
index 7b60d1bd62b..d43784c0a3f 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.strong.transformed.expect
@@ -19,11 +19,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   return self::_extension#0|get#returnType::R%;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   return self::_extension#0|get#parameterType::T%;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   return self::_extension#1|get#parameterType::T;
 static method main() → dynamic {
   function local1(core::int i) → core::int
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.expect
index 7b60d1bd62b..d43784c0a3f 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.expect
@@ -19,11 +19,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   return self::_extension#0|get#returnType::R%;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   return self::_extension#0|get#parameterType::T%;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   return self::_extension#1|get#parameterType::T;
 static method main() → dynamic {
   function local1(core::int i) → core::int
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.modular.expect
index 7b60d1bd62b..d43784c0a3f 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.modular.expect
@@ -19,11 +19,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   return self::_extension#0|get#returnType::R%;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   return self::_extension#0|get#parameterType::T%;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   return self::_extension#1|get#parameterType::T;
 static method main() → dynamic {
   function local1(core::int i) → core::int
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.outline.expect
index 4378b93cf98..96251b25184 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.outline.expect
@@ -17,11 +17,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   ;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   ;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.transformed.expect
index 7b60d1bd62b..d43784c0a3f 100644
--- a/pkg/front_end/testcases/extensions/on_function_type.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_function_type.dart.weak.transformed.expect
@@ -19,11 +19,11 @@ extension /* unnamed */ _extension#0<R extends core::Object? = dynamic, T extend
 extension /* unnamed */ _extension#1<T extends self::Class<T> = self::Class<dynamic>> on <S extends T = dynamic>(T, S) → dynamic {
   get parameterType = self::_extension#1|get#parameterType;
 }
-static method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
+static extension-member method _extension#0|get#returnType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#returnType::T%) → self::_extension#0|get#returnType::R% #this) → core::Type
   return self::_extension#0|get#returnType::R%;
-static method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
+static extension-member method _extension#0|get#parameterType<R extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final (self::_extension#0|get#parameterType::T%) → self::_extension#0|get#parameterType::R% #this) → core::Type
   return self::_extension#0|get#parameterType::T%;
-static method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
+static extension-member method _extension#1|get#parameterType<T extends self::Class<self::_extension#1|get#parameterType::T> = self::Class<dynamic>>(lowered final <S extends self::_extension#1|get#parameterType::T = dynamic>(self::_extension#1|get#parameterType::T, S) → dynamic #this) → core::Type
   return self::_extension#1|get#parameterType::T;
 static method main() → dynamic {
   function local1(core::int i) → core::int
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.expect
index 46f9378ff3c..09c66369153 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.expect
@@ -21,17 +21,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   return null;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   return null;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int*>* x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.transformed.expect
index 46f9378ff3c..09c66369153 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.strong.transformed.expect
@@ -21,17 +21,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   return null;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   return null;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int*>* x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.expect
index 07fc3f1e369..aa5030430e1 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   return null;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   return null;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int*>* x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.modular.expect
index 07fc3f1e369..aa5030430e1 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.modular.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   return null;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   return null;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int*>* x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.outline.expect
index 706787ef1b1..87abc7b8edf 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.outline.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   ;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   ;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   ;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.transformed.expect
index 07fc3f1e369..aa5030430e1 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference.dart.weak.transformed.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num*>* {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
+static extension-member method BestCom|best<T extends core::num*>(lowered final core::Iterable<self::BestCom|best::T*>* #this) → self::BestCom|best::T*
   return null;
-static method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
+static extension-member method BestCom|get#best<T extends core::num*>(lowered final core::Iterable<self::BestCom|get#best::T*>* #this) → () →* self::BestCom|get#best::T*
   return () → self::BestCom|get#best::T* => self::BestCom|best<self::BestCom|get#best::T*>(#this);
-static method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
+static extension-member method BestList|best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|best::T*>* #this) → self::BestList|best::T*
   return null;
-static method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
+static extension-member method BestList|get#best<T extends core::Object* = dynamic>(lowered final core::List<self::BestList|get#best::T*>* #this) → () →* self::BestList|get#best::T*
   return () → self::BestList|get#best::T* => self::BestList|best<self::BestList|get#best::T*>(#this);
-static method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
+static extension-member method BestSpec|best(lowered final core::List<core::num*>* #this) → core::num*
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
+static extension-member method BestSpec|get#best(lowered final core::List<core::num*>* #this) → () →* core::num*
   return () → core::num* => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int*>* x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.expect
index 855d7839f06..2819894365d 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   return null;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   return null;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int>? x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.transformed.expect
index 855d7839f06..2819894365d 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.strong.transformed.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   return null;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   return null;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int>? x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.expect
index 855d7839f06..2819894365d 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   return null;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   return null;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int>? x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.modular.expect
index 855d7839f06..2819894365d 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.modular.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   return null;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   return null;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int>? x;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.outline.expect
index a3a70d1772e..0dfd47b3465 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.outline.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   ;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   ;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   ;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.transformed.expect
index 855d7839f06..2819894365d 100644
--- a/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_inference2.dart.weak.transformed.expect
@@ -14,17 +14,17 @@ extension BestSpec on core::List<core::num> {
   method best = self::BestSpec|best;
   tearoff best = self::BestSpec|get#best;
 }
-static method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
+static extension-member method BestCom|best<T extends core::num>(lowered final core::Iterable<self::BestCom|best::T>? #this) → self::BestCom|best::T?
   return null;
-static method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
+static extension-member method BestCom|get#best<T extends core::num>(lowered final core::Iterable<self::BestCom|get#best::T>? #this) → () → self::BestCom|get#best::T?
   return () → self::BestCom|get#best::T? => self::BestCom|best<self::BestCom|get#best::T>(#this);
-static method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
+static extension-member method BestList|best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|best::T%> #this) → self::BestList|best::T?
   return null;
-static method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
+static extension-member method BestList|get#best<T extends core::Object? = dynamic>(lowered final core::List<self::BestList|get#best::T%> #this) → () → self::BestList|get#best::T?
   return () → self::BestList|get#best::T? => self::BestList|best<self::BestList|get#best::T%>(#this);
-static method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
+static extension-member method BestSpec|best(lowered final core::List<core::num> #this) → core::num?
   return null;
-static method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
+static extension-member method BestSpec|get#best(lowered final core::List<core::num> #this) → () → core::num?
   return () → core::num? => self::BestSpec|best(#this);
 static method main() → dynamic {
   core::List<core::int>? x;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.expect
index 7f87414a886..08d74677ff8 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.expect
@@ -91,13 +91,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   return #this;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   return #this;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
 static method main() → dynamic {
   self::Struct* struct;
   self::StructA* structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.transformed.expect
index 7f87414a886..08d74677ff8 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.strong.transformed.expect
@@ -91,13 +91,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   return #this;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   return #this;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
 static method main() → dynamic {
   self::Struct* struct;
   self::StructA* structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.expect
index 1a7abcbd5e7..5bfd4077d7b 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.expect
@@ -87,13 +87,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   return #this;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   return #this;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
 static method main() → dynamic {
   self::Struct* struct;
   self::StructA* structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.modular.expect
index 1a7abcbd5e7..5bfd4077d7b 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.modular.expect
@@ -87,13 +87,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   return #this;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   return #this;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
 static method main() → dynamic {
   self::Struct* struct;
   self::StructA* structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.outline.expect
index 69ef76ffb7c..f217cefb443 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.outline.expect
@@ -44,13 +44,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   ;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   ;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.transformed.expect
index 1a7abcbd5e7..5bfd4077d7b 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference.dart.weak.transformed.expect
@@ -87,13 +87,13 @@ extension Extension<T extends self::Struct*> on T* {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
+static extension-member method Extension|method<T extends self::Struct*>(lowered final self::Extension|method::T* #this) → self::Extension|method::T*
   return #this;
-static method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
+static extension-member method Extension|get#method<T extends self::Struct*>(lowered final self::Extension|get#method::T* #this) → () →* self::Extension|get#method::T*
   return () → self::Extension|get#method::T* => self::Extension|method<self::Extension|get#method::T*>(#this);
-static method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
+static extension-member method Extension|get#property<T extends self::Struct*>(lowered final self::Extension|get#property::T* #this) → self::Extension|get#property::T*
   return #this;
-static method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct*>(lowered final self::Extension|set#property::T* #this, self::Extension|set#property::T* value) → void {}
 static method main() → dynamic {
   self::Struct* struct;
   self::StructA* structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.expect
index e4581b8291f..3db0b2e8bab 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.expect
@@ -106,13 +106,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   return #this;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   return #this;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
 static method main() → dynamic {
   self::Struct? struct;
   self::StructA? structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.transformed.expect
index 2e572a83003..aa39c670ed5 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.strong.transformed.expect
@@ -106,13 +106,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   return #this;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   return #this;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
 static method main() → dynamic {
   self::Struct? struct;
   self::StructA? structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.expect
index e4581b8291f..3db0b2e8bab 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.expect
@@ -106,13 +106,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   return #this;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   return #this;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
 static method main() → dynamic {
   self::Struct? struct;
   self::StructA? structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.modular.expect
index e4581b8291f..3db0b2e8bab 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.modular.expect
@@ -106,13 +106,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   return #this;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   return #this;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
 static method main() → dynamic {
   self::Struct? struct;
   self::StructA? structA;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.outline.expect
index 22b3904ce02..f9a9cf981f8 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.outline.expect
@@ -24,13 +24,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   ;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   ;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.transformed.expect
index 554471174d6..c81a18b2193 100644
--- a/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/on_type_variable_inference2.dart.weak.transformed.expect
@@ -106,13 +106,13 @@ extension Extension<T extends self::Struct?> on T% {
   get property = self::Extension|get#property;
   set property = self::Extension|set#property;
 }
-static method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
+static extension-member method Extension|method<T extends self::Struct?>(lowered final self::Extension|method::T% #this) → self::Extension|method::T%
   return #this;
-static method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
+static extension-member method Extension|get#method<T extends self::Struct?>(lowered final self::Extension|get#method::T% #this) → () → self::Extension|get#method::T%
   return () → self::Extension|get#method::T% => self::Extension|method<self::Extension|get#method::T%>(#this);
-static method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
+static extension-member method Extension|get#property<T extends self::Struct?>(lowered final self::Extension|get#property::T% #this) → self::Extension|get#property::T%
   return #this;
-static method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
+static extension-member method Extension|set#property<T extends self::Struct?>(lowered final self::Extension|set#property::T% #this, self::Extension|set#property::T% value) → void {}
 static method main() → dynamic {
   self::Struct? struct;
   self::StructA? structA;
diff --git a/pkg/front_end/testcases/extensions/operators.dart.strong.expect b/pkg/front_end/testcases/extensions/operators.dart.strong.expect
index 1d74d406678..e0b67487bec 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.strong.expect
@@ -43,11 +43,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::add}(other){(self::Complex) → self::Complex};
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::sub}(other){(self::Complex) → self::Complex};
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   return #this.{self::Complex::negate}(){() → self::Complex};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/operators.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/operators.dart.strong.transformed.expect
index 1d74d406678..e0b67487bec 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.strong.transformed.expect
@@ -43,11 +43,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::add}(other){(self::Complex) → self::Complex};
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::sub}(other){(self::Complex) → self::Complex};
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   return #this.{self::Complex::negate}(){() → self::Complex};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/operators.dart.weak.expect b/pkg/front_end/testcases/extensions/operators.dart.weak.expect
index 1d74d406678..e0b67487bec 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.weak.expect
@@ -43,11 +43,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::add}(other){(self::Complex) → self::Complex};
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::sub}(other){(self::Complex) → self::Complex};
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   return #this.{self::Complex::negate}(){() → self::Complex};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/operators.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/operators.dart.weak.modular.expect
index 1d74d406678..e0b67487bec 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.weak.modular.expect
@@ -43,11 +43,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::add}(other){(self::Complex) → self::Complex};
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::sub}(other){(self::Complex) → self::Complex};
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   return #this.{self::Complex::negate}(){() → self::Complex};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/operators.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/operators.dart.weak.outline.expect
index 25a387d13d1..29bff4528c4 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.weak.outline.expect
@@ -26,11 +26,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   ;
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   ;
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/operators.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/operators.dart.weak.transformed.expect
index 1d74d406678..e0b67487bec 100644
--- a/pkg/front_end/testcases/extensions/operators.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/operators.dart.weak.transformed.expect
@@ -43,11 +43,11 @@ extension Operators on self::Complex {
   operator - = self::Operators|-;
   operator unary- = self::Operators|unary-;
 }
-static method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|+(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::add}(other){(self::Complex) → self::Complex};
-static method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
+static extension-member method Operators|-(lowered final self::Complex #this, self::Complex other) → self::Complex
   return #this.{self::Complex::sub}(other){(self::Complex) → self::Complex};
-static method Operators|unary-(lowered final self::Complex #this) → self::Complex
+static extension-member method Operators|unary-(lowered final self::Complex #this) → self::Complex
   return #this.{self::Complex::negate}(){() → self::Complex};
 static method main() → dynamic {
   self::implicit();
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.strong.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.strong.expect
index aa96585a4e7..d004be7e705 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.strong.expect
@@ -30,23 +30,23 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField = self::A1::getStaticField();
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   return #this.{self::A1::getInstanceField}(){() → core::int};
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
   #this.{self::A1::setInstanceField}(value){(core::int) → void};
 }
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::+}(value){(core::num) → core::int};
 }
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::-}(value){(core::num) → core::int};
 }
-static method A2|unary-(lowered final self::A1 #this) → core::int {
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::int::unary-}(){() → core::int};
 }
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   return self::A1::getStaticField();
-static set A2|staticProperty(core::int value) → void {
+static extension-member set A2|staticProperty(core::int value) → void {
   self::A1::setStaticField(value);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.strong.transformed.expect
index aa96585a4e7..d004be7e705 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.strong.transformed.expect
@@ -30,23 +30,23 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField = self::A1::getStaticField();
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   return #this.{self::A1::getInstanceField}(){() → core::int};
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
   #this.{self::A1::setInstanceField}(value){(core::int) → void};
 }
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::+}(value){(core::num) → core::int};
 }
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::-}(value){(core::num) → core::int};
 }
-static method A2|unary-(lowered final self::A1 #this) → core::int {
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::int::unary-}(){() → core::int};
 }
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   return self::A1::getStaticField();
-static set A2|staticProperty(core::int value) → void {
+static extension-member set A2|staticProperty(core::int value) → void {
   self::A1::setStaticField(value);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.expect
index aa96585a4e7..d004be7e705 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.expect
@@ -30,23 +30,23 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField = self::A1::getStaticField();
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   return #this.{self::A1::getInstanceField}(){() → core::int};
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
   #this.{self::A1::setInstanceField}(value){(core::int) → void};
 }
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::+}(value){(core::num) → core::int};
 }
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::-}(value){(core::num) → core::int};
 }
-static method A2|unary-(lowered final self::A1 #this) → core::int {
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::int::unary-}(){() → core::int};
 }
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   return self::A1::getStaticField();
-static set A2|staticProperty(core::int value) → void {
+static extension-member set A2|staticProperty(core::int value) → void {
   self::A1::setStaticField(value);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.modular.expect
index aa96585a4e7..d004be7e705 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.modular.expect
@@ -30,23 +30,23 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField = self::A1::getStaticField();
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   return #this.{self::A1::getInstanceField}(){() → core::int};
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
   #this.{self::A1::setInstanceField}(value){(core::int) → void};
 }
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::+}(value){(core::num) → core::int};
 }
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::-}(value){(core::num) → core::int};
 }
-static method A2|unary-(lowered final self::A1 #this) → core::int {
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::int::unary-}(){() → core::int};
 }
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   return self::A1::getStaticField();
-static set A2|staticProperty(core::int value) → void {
+static extension-member set A2|staticProperty(core::int value) → void {
   self::A1::setStaticField(value);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.outline.expect
index 9569ce03a38..669f6d6df81 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.outline.expect
@@ -27,19 +27,19 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField;
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   ;
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void
   ;
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int
   ;
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int
   ;
-static method A2|unary-(lowered final self::A1 #this) → core::int
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int
   ;
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   ;
-static set A2|staticProperty(core::int value) → void
+static extension-member set A2|staticProperty(core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.transformed.expect
index aa96585a4e7..d004be7e705 100644
--- a/pkg/front_end/testcases/extensions/other_kinds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/other_kinds.dart.weak.transformed.expect
@@ -30,23 +30,23 @@ extension A2 on self::A1 {
   static set staticProperty = set self::A2|staticProperty;
 }
 static field core::int A2|staticField = self::A1::getStaticField();
-static method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
+static extension-member method A2|get#instanceProperty(lowered final self::A1 #this) → core::int
   return #this.{self::A1::getInstanceField}(){() → core::int};
-static method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
+static extension-member method A2|set#instanceProperty(lowered final self::A1 #this, core::int value) → void {
   #this.{self::A1::setInstanceField}(value){(core::int) → void};
 }
-static method A2|+(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|+(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::+}(value){(core::num) → core::int};
 }
-static method A2|-(lowered final self::A1 #this, core::int value) → core::int {
+static extension-member method A2|-(lowered final self::A1 #this, core::int value) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::num::-}(value){(core::num) → core::int};
 }
-static method A2|unary-(lowered final self::A1 #this) → core::int {
+static extension-member method A2|unary-(lowered final self::A1 #this) → core::int {
   return #this.{self::A1::getInstanceField}(){() → core::int}.{core::int::unary-}(){() → core::int};
 }
-static get A2|staticProperty() → core::int
+static extension-member get A2|staticProperty() → core::int
   return self::A1::getStaticField();
-static set A2|staticProperty(core::int value) → void {
+static extension-member set A2|staticProperty(core::int value) → void {
   self::A1::setStaticField(value);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.strong.expect b/pkg/front_end/testcases/extensions/post_inc.dart.strong.expect
index a9d88af6ffc..37a90ea5bec 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.strong.expect
@@ -22,12 +22,12 @@ static method expect(core::String expect, core::Object value, core::String expec
     throw "Expected assignment ${expectSet}, actual ${self::setValue}";
   }
 }
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}+${other})";
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}-${other})";
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   return "${#this}.field";
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
   self::setValue = "${#this}.field=${other}";
 }
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/post_inc.dart.strong.transformed.expect
index a9d88af6ffc..37a90ea5bec 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.strong.transformed.expect
@@ -22,12 +22,12 @@ static method expect(core::String expect, core::Object value, core::String expec
     throw "Expected assignment ${expectSet}, actual ${self::setValue}";
   }
 }
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}+${other})";
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}-${other})";
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   return "${#this}.field";
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
   self::setValue = "${#this}.field=${other}";
 }
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.weak.expect b/pkg/front_end/testcases/extensions/post_inc.dart.weak.expect
index a9d88af6ffc..37a90ea5bec 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.weak.expect
@@ -22,12 +22,12 @@ static method expect(core::String expect, core::Object value, core::String expec
     throw "Expected assignment ${expectSet}, actual ${self::setValue}";
   }
 }
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}+${other})";
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}-${other})";
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   return "${#this}.field";
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
   self::setValue = "${#this}.field=${other}";
 }
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/post_inc.dart.weak.modular.expect
index a9d88af6ffc..37a90ea5bec 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.weak.modular.expect
@@ -22,12 +22,12 @@ static method expect(core::String expect, core::Object value, core::String expec
     throw "Expected assignment ${expectSet}, actual ${self::setValue}";
   }
 }
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}+${other})";
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}-${other})";
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   return "${#this}.field";
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
   self::setValue = "${#this}.field=${other}";
 }
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/post_inc.dart.weak.outline.expect
index 9bc9d6f402f..04b3ea8e1fd 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.weak.outline.expect
@@ -13,11 +13,11 @@ static method main() → void
   ;
 static method expect(core::String expect, core::Object value, core::String expectSet) → void
   ;
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   ;
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   ;
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   ;
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void
   ;
diff --git a/pkg/front_end/testcases/extensions/post_inc.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/post_inc.dart.weak.transformed.expect
index a9d88af6ffc..37a90ea5bec 100644
--- a/pkg/front_end/testcases/extensions/post_inc.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/post_inc.dart.weak.transformed.expect
@@ -22,12 +22,12 @@ static method expect(core::String expect, core::Object value, core::String expec
     throw "Expected assignment ${expectSet}, actual ${self::setValue}";
   }
 }
-static method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|+(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}+${other})";
-static method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
+static extension-member method Ops|-(lowered final core::Object #this, core::Object other) → core::Object
   return "(${#this}-${other})";
-static method Ops|get#field(lowered final core::Object #this) → core::Object
+static extension-member method Ops|get#field(lowered final core::Object #this) → core::Object
   return "${#this}.field";
-static method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
+static extension-member method Ops|set#field(lowered final core::Object #this, core::Object other) → void {
   self::setValue = "${#this}.field=${other}";
 }
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.strong.expect b/pkg/front_end/testcases/extensions/private_members.dart.strong.expect
index e098df48cd8..ac2c7dd3264 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.strong.expect
@@ -137,65 +137,65 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = pri::_extension#2|test3;
   tearoff test3 = pri::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   return 42;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   return 87;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   return 24;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   return 78;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(#this));
   pri::expect(87, pri::_PrivateExtension|_privateMethod1(#this));
   pri::expect(24, pri::_PrivateExtension|publicStaticMethod1());
   pri::expect(78, pri::_PrivateExtension|_privateStaticMethod1());
 }
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   return 123;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   return 237;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   return 321;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   return 732;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic {
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic {
   pri::expect(123, pri::PublicExtension|publicMethod2(#this));
   pri::expect(237, pri::PublicExtension|_privateMethod2(#this));
   pri::expect(321, pri::PublicExtension|publicStaticMethod2());
   pri::expect(732, pri::PublicExtension|_privateStaticMethod2());
 }
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   return 473;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   return 586;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   return 374;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   return 685;
-static method _extension#2|test3(lowered final core::String #this) → dynamic {
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic {
   pri::expect(473, pri::_extension#2|publicMethod3(#this));
   pri::expect(586, pri::_extension#2|_privateMethod3(#this));
   pri::expect(374, pri::_extension#2|publicStaticMethod3());
   pri::expect(685, pri::_extension#2|_privateStaticMethod3());
 }
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_extension#2|test3(#this);
 static method test() → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(""));
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/private_members.dart.strong.transformed.expect
index e098df48cd8..ac2c7dd3264 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.strong.transformed.expect
@@ -137,65 +137,65 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = pri::_extension#2|test3;
   tearoff test3 = pri::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   return 42;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   return 87;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   return 24;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   return 78;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(#this));
   pri::expect(87, pri::_PrivateExtension|_privateMethod1(#this));
   pri::expect(24, pri::_PrivateExtension|publicStaticMethod1());
   pri::expect(78, pri::_PrivateExtension|_privateStaticMethod1());
 }
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   return 123;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   return 237;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   return 321;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   return 732;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic {
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic {
   pri::expect(123, pri::PublicExtension|publicMethod2(#this));
   pri::expect(237, pri::PublicExtension|_privateMethod2(#this));
   pri::expect(321, pri::PublicExtension|publicStaticMethod2());
   pri::expect(732, pri::PublicExtension|_privateStaticMethod2());
 }
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   return 473;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   return 586;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   return 374;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   return 685;
-static method _extension#2|test3(lowered final core::String #this) → dynamic {
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic {
   pri::expect(473, pri::_extension#2|publicMethod3(#this));
   pri::expect(586, pri::_extension#2|_privateMethod3(#this));
   pri::expect(374, pri::_extension#2|publicStaticMethod3());
   pri::expect(685, pri::_extension#2|_privateStaticMethod3());
 }
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_extension#2|test3(#this);
 static method test() → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(""));
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.weak.expect b/pkg/front_end/testcases/extensions/private_members.dart.weak.expect
index e098df48cd8..ac2c7dd3264 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.weak.expect
@@ -137,65 +137,65 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = pri::_extension#2|test3;
   tearoff test3 = pri::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   return 42;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   return 87;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   return 24;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   return 78;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(#this));
   pri::expect(87, pri::_PrivateExtension|_privateMethod1(#this));
   pri::expect(24, pri::_PrivateExtension|publicStaticMethod1());
   pri::expect(78, pri::_PrivateExtension|_privateStaticMethod1());
 }
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   return 123;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   return 237;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   return 321;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   return 732;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic {
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic {
   pri::expect(123, pri::PublicExtension|publicMethod2(#this));
   pri::expect(237, pri::PublicExtension|_privateMethod2(#this));
   pri::expect(321, pri::PublicExtension|publicStaticMethod2());
   pri::expect(732, pri::PublicExtension|_privateStaticMethod2());
 }
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   return 473;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   return 586;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   return 374;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   return 685;
-static method _extension#2|test3(lowered final core::String #this) → dynamic {
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic {
   pri::expect(473, pri::_extension#2|publicMethod3(#this));
   pri::expect(586, pri::_extension#2|_privateMethod3(#this));
   pri::expect(374, pri::_extension#2|publicStaticMethod3());
   pri::expect(685, pri::_extension#2|_privateStaticMethod3());
 }
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_extension#2|test3(#this);
 static method test() → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(""));
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/private_members.dart.weak.modular.expect
index e098df48cd8..ac2c7dd3264 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.weak.modular.expect
@@ -137,65 +137,65 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = pri::_extension#2|test3;
   tearoff test3 = pri::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   return 42;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   return 87;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   return 24;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   return 78;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(#this));
   pri::expect(87, pri::_PrivateExtension|_privateMethod1(#this));
   pri::expect(24, pri::_PrivateExtension|publicStaticMethod1());
   pri::expect(78, pri::_PrivateExtension|_privateStaticMethod1());
 }
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   return 123;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   return 237;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   return 321;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   return 732;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic {
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic {
   pri::expect(123, pri::PublicExtension|publicMethod2(#this));
   pri::expect(237, pri::PublicExtension|_privateMethod2(#this));
   pri::expect(321, pri::PublicExtension|publicStaticMethod2());
   pri::expect(732, pri::PublicExtension|_privateStaticMethod2());
 }
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   return 473;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   return 586;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   return 374;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   return 685;
-static method _extension#2|test3(lowered final core::String #this) → dynamic {
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic {
   pri::expect(473, pri::_extension#2|publicMethod3(#this));
   pri::expect(586, pri::_extension#2|_privateMethod3(#this));
   pri::expect(374, pri::_extension#2|publicStaticMethod3());
   pri::expect(685, pri::_extension#2|_privateStaticMethod3());
 }
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_extension#2|test3(#this);
 static method test() → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(""));
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/private_members.dart.weak.outline.expect
index 4c90f93a12e..4d24bc57751 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.weak.outline.expect
@@ -42,53 +42,53 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = self2::_extension#2|test3;
   tearoff test3 = self2::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   ;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => self2::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   ;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => self2::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   ;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   ;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic
   ;
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => self2::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   ;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => self2::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   ;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => self2::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   ;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   ;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic
   ;
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => self2::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   ;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => self2::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   ;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => self2::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   ;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   ;
-static method _extension#2|test3(lowered final core::String #this) → dynamic
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic
   ;
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => self2::_extension#2|test3(#this);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/private_members.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/private_members.dart.weak.transformed.expect
index e098df48cd8..ac2c7dd3264 100644
--- a/pkg/front_end/testcases/extensions/private_members.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/private_members.dart.weak.transformed.expect
@@ -137,65 +137,65 @@ extension /* unnamed */ _extension#2 on core::String {
   method test3 = pri::_extension#2|test3;
   tearoff test3 = pri::_extension#2|get#test3;
 }
-static method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|publicMethod1(lowered final core::String #this) → core::int
   return 42;
-static method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#publicMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|publicMethod1(#this);
-static method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
+static extension-member method _PrivateExtension|_privateMethod1(lowered final core::String #this) → core::int
   return 87;
-static method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
+static extension-member method _PrivateExtension|get#_privateMethod1(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_PrivateExtension|_privateMethod1(#this);
-static method _PrivateExtension|publicStaticMethod1() → core::int
+static extension-member method _PrivateExtension|publicStaticMethod1() → core::int
   return 24;
-static method _PrivateExtension|_privateStaticMethod1() → core::int
+static extension-member method _PrivateExtension|_privateStaticMethod1() → core::int
   return 78;
-static method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
+static extension-member method _PrivateExtension|test1(lowered final core::String #this) → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(#this));
   pri::expect(87, pri::_PrivateExtension|_privateMethod1(#this));
   pri::expect(24, pri::_PrivateExtension|publicStaticMethod1());
   pri::expect(78, pri::_PrivateExtension|_privateStaticMethod1());
 }
-static method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
+static extension-member method _PrivateExtension|get#test1(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_PrivateExtension|test1(#this);
-static method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|publicMethod2(lowered final core::String #this) → core::int
   return 123;
-static method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#publicMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|publicMethod2(#this);
-static method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
+static extension-member method PublicExtension|_privateMethod2(lowered final core::String #this) → core::int
   return 237;
-static method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
+static extension-member method PublicExtension|get#_privateMethod2(lowered final core::String #this) → () → core::int
   return () → core::int => pri::PublicExtension|_privateMethod2(#this);
-static method PublicExtension|publicStaticMethod2() → core::int
+static extension-member method PublicExtension|publicStaticMethod2() → core::int
   return 321;
-static method PublicExtension|_privateStaticMethod2() → core::int
+static extension-member method PublicExtension|_privateStaticMethod2() → core::int
   return 732;
-static method PublicExtension|test2(lowered final core::String #this) → dynamic {
+static extension-member method PublicExtension|test2(lowered final core::String #this) → dynamic {
   pri::expect(123, pri::PublicExtension|publicMethod2(#this));
   pri::expect(237, pri::PublicExtension|_privateMethod2(#this));
   pri::expect(321, pri::PublicExtension|publicStaticMethod2());
   pri::expect(732, pri::PublicExtension|_privateStaticMethod2());
 }
-static method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
+static extension-member method PublicExtension|get#test2(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::PublicExtension|test2(#this);
-static method _extension#2|publicMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|publicMethod3(lowered final core::String #this) → core::int
   return 473;
-static method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#publicMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|publicMethod3(#this);
-static method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
+static extension-member method _extension#2|_privateMethod3(lowered final core::String #this) → core::int
   return 586;
-static method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
+static extension-member method _extension#2|get#_privateMethod3(lowered final core::String #this) → () → core::int
   return () → core::int => pri::_extension#2|_privateMethod3(#this);
-static method _extension#2|publicStaticMethod3() → core::int
+static extension-member method _extension#2|publicStaticMethod3() → core::int
   return 374;
-static method _extension#2|_privateStaticMethod3() → core::int
+static extension-member method _extension#2|_privateStaticMethod3() → core::int
   return 685;
-static method _extension#2|test3(lowered final core::String #this) → dynamic {
+static extension-member method _extension#2|test3(lowered final core::String #this) → dynamic {
   pri::expect(473, pri::_extension#2|publicMethod3(#this));
   pri::expect(586, pri::_extension#2|_privateMethod3(#this));
   pri::expect(374, pri::_extension#2|publicStaticMethod3());
   pri::expect(685, pri::_extension#2|_privateStaticMethod3());
 }
-static method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
+static extension-member method _extension#2|get#test3(lowered final core::String #this) → () → dynamic
   return () → dynamic => pri::_extension#2|test3(#this);
 static method test() → dynamic {
   pri::expect(42, pri::_PrivateExtension|publicMethod1(""));
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.strong.expect b/pkg/front_end/testcases/extensions/shadowing.dart.strong.expect
index ea274cd2cdf..472394460d1 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.strong.expect
@@ -21,10 +21,10 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter = 42;
 static field core::int setter = 42;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   return 42;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
-static method _extension#0|method(lowered final core::int #this) → dynamic {
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/shadowing.dart:13:5: Error: Setter not found: 'getter'.
     getter = getter;
     ^^^^^^";
@@ -32,5 +32,5 @@ static method _extension#0|method(lowered final core::int #this) → dynamic {
     setter = setter;
              ^^^^^^");
 }
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/shadowing.dart.strong.transformed.expect
index ea274cd2cdf..472394460d1 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.strong.transformed.expect
@@ -21,10 +21,10 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter = 42;
 static field core::int setter = 42;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   return 42;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
-static method _extension#0|method(lowered final core::int #this) → dynamic {
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/shadowing.dart:13:5: Error: Setter not found: 'getter'.
     getter = getter;
     ^^^^^^";
@@ -32,5 +32,5 @@ static method _extension#0|method(lowered final core::int #this) → dynamic {
     setter = setter;
              ^^^^^^");
 }
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.weak.expect b/pkg/front_end/testcases/extensions/shadowing.dart.weak.expect
index ea274cd2cdf..472394460d1 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.weak.expect
@@ -21,10 +21,10 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter = 42;
 static field core::int setter = 42;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   return 42;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
-static method _extension#0|method(lowered final core::int #this) → dynamic {
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/shadowing.dart:13:5: Error: Setter not found: 'getter'.
     getter = getter;
     ^^^^^^";
@@ -32,5 +32,5 @@ static method _extension#0|method(lowered final core::int #this) → dynamic {
     setter = setter;
              ^^^^^^");
 }
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/shadowing.dart.weak.modular.expect
index ea274cd2cdf..472394460d1 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.weak.modular.expect
@@ -21,10 +21,10 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter = 42;
 static field core::int setter = 42;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   return 42;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
-static method _extension#0|method(lowered final core::int #this) → dynamic {
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/shadowing.dart:13:5: Error: Setter not found: 'getter'.
     getter = getter;
     ^^^^^^";
@@ -32,5 +32,5 @@ static method _extension#0|method(lowered final core::int #this) → dynamic {
     setter = setter;
              ^^^^^^");
 }
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/shadowing.dart.weak.outline.expect
index 3b88c2b45ec..740e29a1fad 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.weak.outline.expect
@@ -10,11 +10,11 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter;
 static field core::int setter;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   ;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void
   ;
-static method _extension#0|method(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic
   ;
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/shadowing.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/shadowing.dart.weak.transformed.expect
index ea274cd2cdf..472394460d1 100644
--- a/pkg/front_end/testcases/extensions/shadowing.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/shadowing.dart.weak.transformed.expect
@@ -21,10 +21,10 @@ extension /* unnamed */ _extension#0 on core::int {
 }
 static field core::int getter = 42;
 static field core::int setter = 42;
-static method _extension#0|get#getter(lowered final core::int #this) → dynamic
+static extension-member method _extension#0|get#getter(lowered final core::int #this) → dynamic
   return 42;
-static method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
-static method _extension#0|method(lowered final core::int #this) → dynamic {
+static extension-member method _extension#0|set#setter(lowered final core::int #this, dynamic _) → void {}
+static extension-member method _extension#0|method(lowered final core::int #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/shadowing.dart:13:5: Error: Setter not found: 'getter'.
     getter = getter;
     ^^^^^^";
@@ -32,5 +32,5 @@ static method _extension#0|method(lowered final core::int #this) → dynamic {
     setter = setter;
              ^^^^^^");
 }
-static method _extension#0|get#method(lowered final core::int #this) → () → dynamic
+static extension-member method _extension#0|get#method(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::_extension#0|method(#this);
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.strong.expect b/pkg/front_end/testcases/extensions/static_access.dart.strong.expect
index 7119c439bef..181f325a08d 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.strong.expect
@@ -19,17 +19,17 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
-static get Extension|property() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
+static extension-member get Extension|property() → dynamic
   return 42;
-static set Extension|property(dynamic value) → void {}
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member set Extension|property(dynamic value) → void {}
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   self::Extension|method();
   self::Extension|genericMethod<core::int>(42);
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/static_access.dart.strong.transformed.expect
index 7119c439bef..181f325a08d 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.strong.transformed.expect
@@ -19,17 +19,17 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
-static get Extension|property() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
+static extension-member get Extension|property() → dynamic
   return 42;
-static set Extension|property(dynamic value) → void {}
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member set Extension|property(dynamic value) → void {}
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   self::Extension|method();
   self::Extension|genericMethod<core::int>(42);
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.weak.expect b/pkg/front_end/testcases/extensions/static_access.dart.weak.expect
index 7119c439bef..181f325a08d 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.weak.expect
@@ -19,17 +19,17 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
-static get Extension|property() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
+static extension-member get Extension|property() → dynamic
   return 42;
-static set Extension|property(dynamic value) → void {}
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member set Extension|property(dynamic value) → void {}
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   self::Extension|method();
   self::Extension|genericMethod<core::int>(42);
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/static_access.dart.weak.modular.expect
index 7119c439bef..181f325a08d 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.weak.modular.expect
@@ -19,17 +19,17 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
-static get Extension|property() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
+static extension-member get Extension|property() → dynamic
   return 42;
-static set Extension|property(dynamic value) → void {}
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member set Extension|property(dynamic value) → void {}
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   self::Extension|method();
   self::Extension|genericMethod<core::int>(42);
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/static_access.dart.weak.outline.expect
index 7262dca94a1..8a528512838 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.weak.outline.expect
@@ -18,21 +18,21 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic
+static extension-member method Extension|method() → dynamic
   ;
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic
   ;
-static get Extension|property() → dynamic
+static extension-member get Extension|property() → dynamic
   ;
-static set Extension|property(dynamic value) → void
+static extension-member set Extension|property(dynamic value) → void
   ;
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   ;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/static_access.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/static_access.dart.weak.transformed.expect
index 7119c439bef..181f325a08d 100644
--- a/pkg/front_end/testcases/extensions/static_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/static_access.dart.weak.transformed.expect
@@ -19,17 +19,17 @@ extension Extension on self::Class {
   set instanceProperty = self::Extension|set#instanceProperty;
 }
 static field dynamic Extension|field;
-static method Extension|method() → dynamic {}
-static method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
-static get Extension|property() → dynamic
+static extension-member method Extension|method() → dynamic {}
+static extension-member method Extension|genericMethod<T extends core::Object? = dynamic>(self::Extension|genericMethod::T% t) → dynamic {}
+static extension-member get Extension|property() → dynamic
   return 42;
-static set Extension|property(dynamic value) → void {}
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member set Extension|property(dynamic value) → void {}
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   self::Extension|method();
   self::Extension|genericMethod<core::int>(42);
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.expect
index 7f89731093c..bd53c6b3941 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.expect
@@ -32,12 +32,12 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/static_access_of_instance.dart:14:13: Error: Member not found: 'Extension.instanceMethod'.
   Extension.instanceMethod();
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.transformed.expect
index 7f89731093c..bd53c6b3941 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.strong.transformed.expect
@@ -32,12 +32,12 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/static_access_of_instance.dart:14:13: Error: Member not found: 'Extension.instanceMethod'.
   Extension.instanceMethod();
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.expect
index 7f89731093c..bd53c6b3941 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.expect
@@ -32,12 +32,12 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/static_access_of_instance.dart:14:13: Error: Member not found: 'Extension.instanceMethod'.
   Extension.instanceMethod();
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.modular.expect
index 7f89731093c..bd53c6b3941 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.modular.expect
@@ -32,12 +32,12 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/static_access_of_instance.dart:14:13: Error: Member not found: 'Extension.instanceMethod'.
   Extension.instanceMethod();
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.outline.expect
index f07a15b79a9..ae5a229aa56 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.outline.expect
@@ -12,13 +12,13 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   ;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.transformed.expect
index 7f89731093c..bd53c6b3941 100644
--- a/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/static_access_of_instance.dart.weak.transformed.expect
@@ -32,12 +32,12 @@ extension Extension on self::Class {
   get instanceProperty = self::Extension|get#instanceProperty;
   set instanceProperty = self::Extension|set#instanceProperty;
 }
-static method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
-static method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|instanceMethod(lowered final self::Class #this) → dynamic {}
+static extension-member method Extension|get#instanceMethod(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
+static extension-member method Extension|get#instanceProperty(lowered final self::Class #this) → dynamic
   return 42;
-static method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
+static extension-member method Extension|set#instanceProperty(lowered final self::Class #this, dynamic value) → void {}
 static method main() → dynamic {
   invalid-expression "pkg/front_end/testcases/extensions/static_access_of_instance.dart:14:13: Error: Member not found: 'Extension.instanceMethod'.
   Extension.instanceMethod();
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.strong.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.strong.expect
index 1572ffa3eec..c5560b2dfcb 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.strong.expect
@@ -45,23 +45,23 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   return t;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic {
   (core::String*) →* core::String* stringId = self::Extension|get#id(#this)<core::String*>;
 }
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic {
   (core::int*) →* core::int* intId = invalid-expression "pkg/front_end/testcases/extensions/tear_offs.dart:19:31: Error: A value of type 'T Function<T>(T)' can't be assigned to a variable of type 'int Function(int)'.
     int Function(int) intId = getter;
                               ^" in self::Extension|get#getter(#this) as{TypeError,ForLegacy} (core::int*) →* core::int*;
 }
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.strong.transformed.expect
index 1572ffa3eec..c5560b2dfcb 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.strong.transformed.expect
@@ -45,23 +45,23 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   return t;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic {
   (core::String*) →* core::String* stringId = self::Extension|get#id(#this)<core::String*>;
 }
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic {
   (core::int*) →* core::int* intId = invalid-expression "pkg/front_end/testcases/extensions/tear_offs.dart:19:31: Error: A value of type 'T Function<T>(T)' can't be assigned to a variable of type 'int Function(int)'.
     int Function(int) intId = getter;
                               ^" in self::Extension|get#getter(#this) as{TypeError,ForLegacy} (core::int*) →* core::int*;
 }
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.expect
index e6d5c724b48..730f2edb000 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.expect
@@ -41,23 +41,23 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   return t;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic {
   (core::String*) →* core::String* stringId = self::Extension|get#id(#this)<core::String*>;
 }
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic {
   (core::int*) →* core::int* intId = invalid-expression "pkg/front_end/testcases/extensions/tear_offs.dart:19:31: Error: A value of type 'T Function<T>(T)' can't be assigned to a variable of type 'int Function(int)'.
     int Function(int) intId = getter;
                               ^" in self::Extension|get#getter(#this) as{TypeError,ForLegacy} (core::int*) →* core::int*;
 }
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.modular.expect
index e6d5c724b48..730f2edb000 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.modular.expect
@@ -41,23 +41,23 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   return t;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic {
   (core::String*) →* core::String* stringId = self::Extension|get#id(#this)<core::String*>;
 }
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic {
   (core::int*) →* core::int* intId = invalid-expression "pkg/front_end/testcases/extensions/tear_offs.dart:19:31: Error: A value of type 'T Function<T>(T)' can't be assigned to a variable of type 'int Function(int)'.
     int Function(int) intId = getter;
                               ^" in self::Extension|get#getter(#this) as{TypeError,ForLegacy} (core::int*) →* core::int*;
 }
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.outline.expect
index 3381ee19c74..2f2631e8a06 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.outline.expect
@@ -25,19 +25,19 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   ;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   ;
-static method Extension|method(lowered final self::Class* #this) → dynamic
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic
   ;
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic
   ;
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.transformed.expect
index e6d5c724b48..730f2edb000 100644
--- a/pkg/front_end/testcases/extensions/tear_offs.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs.dart.weak.transformed.expect
@@ -41,23 +41,23 @@ extension Extension on self::Class* {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
+static extension-member method Extension|id<T extends core::Object* = dynamic>(lowered final self::Class* #this, self::Extension|id::T* t) → self::Extension|id::T*
   return t;
-static method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#id(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return <T extends core::Object* = dynamic>(T* t) → T* => self::Extension|id<T*>(#this, t);
-static method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
+static extension-member method Extension|get#getter(lowered final self::Class* #this) → <T extends core::Object* = dynamic>(T*) →* T*
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class* #this) → dynamic {
   (core::String*) →* core::String* stringId = self::Extension|get#id(#this)<core::String*>;
 }
-static method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class* #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class* #this) → dynamic {
   (core::int*) →* core::int* intId = invalid-expression "pkg/front_end/testcases/extensions/tear_offs.dart:19:31: Error: A value of type 'T Function<T>(T)' can't be assigned to a variable of type 'int Function(int)'.
     int Function(int) intId = getter;
                               ^" in self::Extension|get#getter(#this) as{TypeError,ForLegacy} (core::int*) →* core::int*;
 }
-static method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
+static extension-member method Extension|get#errors(lowered final self::Class* #this) → () →* dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class* c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.expect
index 8cdb3799d58..55ca742f889 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   return t;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {
   (core::String) → core::String stringId = self::Extension|get#id(#this)<core::String>;
 }
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic {
   (core::int) → core::int intId = self::Extension|get#getter(#this)<core::int>;
 }
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.transformed.expect
index 8cdb3799d58..55ca742f889 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.strong.transformed.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   return t;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {
   (core::String) → core::String stringId = self::Extension|get#id(#this)<core::String>;
 }
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic {
   (core::int) → core::int intId = self::Extension|get#getter(#this)<core::int>;
 }
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.expect
index 8cdb3799d58..55ca742f889 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   return t;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {
   (core::String) → core::String stringId = self::Extension|get#id(#this)<core::String>;
 }
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic {
   (core::int) → core::int intId = self::Extension|get#getter(#this)<core::int>;
 }
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.modular.expect
index 8cdb3799d58..55ca742f889 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.modular.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   return t;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {
   (core::String) → core::String stringId = self::Extension|get#id(#this)<core::String>;
 }
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic {
   (core::int) → core::int intId = self::Extension|get#getter(#this)<core::int>;
 }
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.outline.expect
index b7b60fa9532..86c78cc1957 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.outline.expect
@@ -15,19 +15,19 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   ;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   ;
-static method Extension|method(lowered final self::Class #this) → dynamic
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic
   ;
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.transformed.expect
index 8cdb3799d58..55ca742f889 100644
--- a/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/tear_offs2.dart.weak.transformed.expect
@@ -16,21 +16,21 @@ extension Extension on self::Class {
   method errors = self::Extension|errors;
   tearoff errors = self::Extension|get#errors;
 }
-static method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
+static extension-member method Extension|id<T extends core::Object? = dynamic>(lowered final self::Class #this, self::Extension|id::T% t) → self::Extension|id::T%
   return t;
-static method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#id(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::Extension|id<T%>(#this, t);
-static method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
+static extension-member method Extension|get#getter(lowered final self::Class #this) → <T extends core::Object? = dynamic>(T%) → T%
   return self::Extension|get#id(#this);
-static method Extension|method(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|method(lowered final self::Class #this) → dynamic {
   (core::String) → core::String stringId = self::Extension|get#id(#this)<core::String>;
 }
-static method Extension|get#method(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#method(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|method(#this);
-static method Extension|errors(lowered final self::Class #this) → dynamic {
+static extension-member method Extension|errors(lowered final self::Class #this) → dynamic {
   (core::int) → core::int intId = self::Extension|get#getter(#this)<core::int>;
 }
-static method Extension|get#errors(lowered final self::Class #this) → () → dynamic
+static extension-member method Extension|get#errors(lowered final self::Class #this) → () → dynamic
   return () → dynamic => self::Extension|errors(#this);
 static method main() → dynamic {
   self::Class c = new self::Class::•();
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.expect
index e2b255767f3..7a7de4b5f28 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.expect
@@ -37,13 +37,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   return #this;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   return #this;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class* {
   if(t1 is{ForLegacy} self::SubClass*) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.transformed.expect
index e2b255767f3..7a7de4b5f28 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.strong.transformed.expect
@@ -37,13 +37,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   return #this;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   return #this;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class* {
   if(t1 is{ForLegacy} self::SubClass*) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.expect
index ff0230a6288..ad3ed6cc599 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.expect
@@ -30,13 +30,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   return #this;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   return #this;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class* {
   if(t1 is{ForLegacy} self::SubClass*) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.modular.expect
index ff0230a6288..ad3ed6cc599 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.modular.expect
@@ -30,13 +30,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   return #this;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   return #this;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class* {
   if(t1 is{ForLegacy} self::SubClass*) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.outline.expect
index 55e0c367455..c3186b09f47 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.outline.expect
@@ -28,13 +28,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   ;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   ;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class*
   ;
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.transformed.expect
index ff0230a6288..ad3ed6cc599 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound.dart.weak.transformed.expect
@@ -30,13 +30,13 @@ extension BoundExtension<T extends self::Class*> on T* {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
+static extension-member method Extension|method1<T extends core::Object* = dynamic>(lowered final self::Extension|method1::T* #this) → self::Extension|method1::T*
   return #this;
-static method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
+static extension-member method Extension|get#method1<T extends core::Object* = dynamic>(lowered final self::Extension|get#method1::T* #this) → () →* self::Extension|get#method1::T*
   return () → self::Extension|get#method1::T* => self::Extension|method1<self::Extension|get#method1::T*>(#this);
-static method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
+static extension-member method BoundExtension|method2<T extends self::Class*>(lowered final self::BoundExtension|method2::T* #this) → self::BoundExtension|method2::T*
   return #this;
-static method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
+static extension-member method BoundExtension|get#method2<T extends self::Class*>(lowered final self::BoundExtension|get#method2::T* #this) → () →* self::BoundExtension|get#method2::T*
   return () → self::BoundExtension|get#method2::T* => self::BoundExtension|method2<self::BoundExtension|get#method2::T*>(#this);
 static method test1<T extends core::Object* = dynamic>(self::test1::T* t1) → self::Class* {
   if(t1 is{ForLegacy} self::SubClass*) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.expect
index dc682c372c2..d161c22b73c 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.expect
@@ -29,13 +29,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.transformed.expect
index 8874737fa63..50cd3322be6 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.strong.transformed.expect
@@ -29,13 +29,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.expect
index 772cfcdeddd..c13a0b06736 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.expect
@@ -29,13 +29,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.modular.expect
index 772cfcdeddd..c13a0b06736 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.modular.expect
@@ -29,13 +29,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.outline.expect
index 8591fd7ea93..0c6430dbdfa 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.outline.expect
@@ -18,13 +18,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   ;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   ;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class
   ;
diff --git a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.transformed.expect
index e684422c666..1bafa43849b 100644
--- a/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variable_bound2.dart.weak.transformed.expect
@@ -29,13 +29,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.strong.expect b/pkg/front_end/testcases/extensions/type_variables.dart.strong.expect
index 19ecc488d2c..f551454afcf 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.strong.expect
@@ -19,20 +19,20 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
   return #this;
 }
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
   core::print(o);
   core::print(self::A2|method2::T%);
   core::print(self::A2|method2::S);
   return #this;
 }
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/type_variables.dart.strong.transformed.expect
index 19ecc488d2c..f551454afcf 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.strong.transformed.expect
@@ -19,20 +19,20 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
   return #this;
 }
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
   core::print(o);
   core::print(self::A2|method2::T%);
   core::print(self::A2|method2::S);
   return #this;
 }
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.weak.expect b/pkg/front_end/testcases/extensions/type_variables.dart.weak.expect
index 19ecc488d2c..f551454afcf 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.weak.expect
@@ -19,20 +19,20 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
   return #this;
 }
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
   core::print(o);
   core::print(self::A2|method2::T%);
   core::print(self::A2|method2::S);
   return #this;
 }
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/type_variables.dart.weak.modular.expect
index 19ecc488d2c..f551454afcf 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.weak.modular.expect
@@ -19,20 +19,20 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
   return #this;
 }
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
   core::print(o);
   core::print(self::A2|method2::T%);
   core::print(self::A2|method2::S);
   return #this;
 }
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/type_variables.dart.weak.outline.expect
index 99b5e2d7df9..9c467c16db4 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.weak.outline.expect
@@ -18,17 +18,17 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%>
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%>
   ;
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%>
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%>
   ;
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic
   ;
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/type_variables.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/type_variables.dart.weak.transformed.expect
index 19ecc488d2c..f551454afcf 100644
--- a/pkg/front_end/testcases/extensions/type_variables.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/type_variables.dart.weak.transformed.expect
@@ -19,20 +19,20 @@ extension A4<T extends core::Object? = dynamic> on self::A1<T%> {
   method method = self::A4|method;
   tearoff method = self::A4|get#method;
 }
-static method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
+static extension-member method A2|method1<T extends core::Object? = dynamic, S extends self::A2|method1::T% = dynamic>(lowered final self::A1<self::A2|method1::T%> #this) → self::A1<self::A2|method1::T%> {
   return #this;
 }
-static method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
+static extension-member method A2|get#method1<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method1::T%> #this) → <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%>
   return <S extends self::A2|get#method1::T% = dynamic>() → self::A1<self::A2|get#method1::T%> => self::A2|method1<self::A2|get#method1::T%, S%>(#this);
-static method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
+static extension-member method A2|method2<T extends core::Object? = dynamic, S extends self::A1<self::A2|method2::T%> = self::A1<dynamic>>(lowered final self::A1<self::A2|method2::T%> #this, self::A2|method2::S o) → self::A1<self::A2|method2::T%> {
   core::print(o);
   core::print(self::A2|method2::T%);
   core::print(self::A2|method2::S);
   return #this;
 }
-static method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
+static extension-member method A2|get#method2<T extends core::Object? = dynamic>(lowered final self::A1<self::A2|get#method2::T%> #this) → <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S) → self::A1<self::A2|get#method2::T%>
   return <S extends self::A1<self::A2|get#method2::T%> = self::A1<dynamic>>(S o) → self::A1<self::A2|get#method2::T%> => self::A2|method2<self::A2|get#method2::T%, S>(#this, o);
-static method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
-static method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method A4|method<#T extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::A1<self::A4|method::#T%> #this) → dynamic {}
+static extension-member method A4|get#method<#T extends core::Object? = dynamic>(lowered final self::A1<self::A4|get#method::#T%> #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::A4|method<self::A4|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.expect
index b04a12ffda9..064f5a18379 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.expect
@@ -34,44 +34,44 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::_extension#0|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method _extension#1|method(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::_extension#1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.transformed.expect
index 0da871ee446..de49f11f770 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.strong.transformed.expect
@@ -34,44 +34,44 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::_extension#0|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method _extension#1|method(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::_extension#1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.expect
index b04a12ffda9..064f5a18379 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.expect
@@ -34,44 +34,44 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::_extension#0|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method _extension#1|method(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::_extension#1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.modular.expect
index b04a12ffda9..064f5a18379 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.modular.expect
@@ -34,44 +34,44 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::_extension#0|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method _extension#1|method(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::_extension#1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.outline.expect
index bd10376fbd8..fc64a10c50c 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.outline.expect
@@ -32,29 +32,29 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int
   ;
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num
   ;
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int
   ;
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void
   ;
-static method _extension#1|method(lowered final self::Class2 #this) → core::int
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int
   ;
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num
   ;
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int
   ;
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.transformed.expect
index 0da871ee446..de49f11f770 100644
--- a/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/unnamed_extensions.dart.weak.transformed.expect
@@ -34,44 +34,44 @@ extension /* unnamed */ _extension#1 on self::Class2 {
   get property = self::_extension#1|get#property;
   set property = self::_extension#1|set#property;
 }
-static method _extension#0|method(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|method(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.method on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
+static extension-member method _extension#0|get#method(lowered final self::Class1 #this) → () → core::int
   return () → core::int => self::_extension#0|method(#this);
-static method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
+static extension-member method _extension#0|genericMethod<T extends core::num>(lowered final self::Class1 #this, self::_extension#0|genericMethod::T t) → core::num {
   core::print("Extension1.genericMethod<${self::_extension#0|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class1::field}{core::int}.{core::num::+}(t){(core::num) → core::num};
 }
-static method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#0|get#genericMethod(lowered final self::Class1 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#0|genericMethod<T>(#this, t);
-static method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
+static extension-member method _extension#0|get#property(lowered final self::Class1 #this) → core::int {
   core::print("Extension1.property get on ${#this}");
   return #this.{self::Class1::field}{core::int};
 }
-static method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
+static extension-member method _extension#0|set#property(lowered final self::Class1 #this, core::int value) → void {
   #this.{self::Class1::field} = value;
   core::print("Extension1.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
 }
-static method _extension#1|method(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|method(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.method on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(3){(core::num) → core::int};
 }
-static method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
+static extension-member method _extension#1|get#method(lowered final self::Class2 #this) → () → core::int
   return () → core::int => self::_extension#1|method(#this);
-static method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
+static extension-member method _extension#1|genericMethod<T extends core::num>(lowered final self::Class2 #this, self::_extension#1|genericMethod::T t) → core::num {
   core::print("Extension2.genericMethod<${self::_extension#1|genericMethod::T}>(${t}) on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(t){(core::num) → core::num}.{core::num::+}(4){(core::num) → core::num};
 }
-static method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
+static extension-member method _extension#1|get#genericMethod(lowered final self::Class2 #this) → <T extends core::num>(T) → core::num
   return <T extends core::num>(T t) → core::num => self::_extension#1|genericMethod<T>(#this, t);
-static method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
+static extension-member method _extension#1|get#property(lowered final self::Class2 #this) → core::int {
   core::print("Extension2.property get on ${#this}");
   return #this.{self::Class2::field}{core::int}.{core::num::+}(5){(core::num) → core::int};
 }
-static method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
+static extension-member method _extension#1|set#property(lowered final self::Class2 #this, core::int value) → void {
   core::print("Extension2.property set(${value}) on ${#this}");
   value = value.{core::num::+}(1){(core::num) → core::int};
   #this.{self::Class2::field} = value;
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.strong.expect b/pkg/front_end/testcases/extensions/use_this.dart.strong.expect
index 2b102c25690..865fb8bf4c7 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.strong.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.strong.expect
@@ -24,26 +24,26 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.strong.transformed.expect b/pkg/front_end/testcases/extensions/use_this.dart.strong.transformed.expect
index 2b102c25690..865fb8bf4c7 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.strong.transformed.expect
@@ -24,26 +24,26 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.weak.expect b/pkg/front_end/testcases/extensions/use_this.dart.weak.expect
index 2b102c25690..865fb8bf4c7 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.weak.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.weak.expect
@@ -24,26 +24,26 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.weak.modular.expect b/pkg/front_end/testcases/extensions/use_this.dart.weak.modular.expect
index 2b102c25690..865fb8bf4c7 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.weak.modular.expect
@@ -24,26 +24,26 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.weak.outline.expect b/pkg/front_end/testcases/extensions/use_this.dart.weak.outline.expect
index bbf115f1431..9c239602780 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.weak.outline.expect
@@ -22,21 +22,21 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1
   ;
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1
   ;
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%>
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%>
   ;
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%>
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%>
   ;
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/extensions/use_this.dart.weak.transformed.expect b/pkg/front_end/testcases/extensions/use_this.dart.weak.transformed.expect
index 2b102c25690..865fb8bf4c7 100644
--- a/pkg/front_end/testcases/extensions/use_this.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/extensions/use_this.dart.weak.transformed.expect
@@ -24,26 +24,26 @@ extension B2<T extends core::Object? = dynamic> on self::B1<T%> {
   method method2 = self::B2|method2;
   tearoff method2 = self::B2|get#method2;
 }
-static method A2|method1(lowered final self::A1 #this) → self::A1 {
+static extension-member method A2|method1(lowered final self::A1 #this) → self::A1 {
   return #this;
 }
-static method A2|get#method1(lowered final self::A1 #this) → () → self::A1
+static extension-member method A2|get#method1(lowered final self::A1 #this) → () → self::A1
   return () → self::A1 => self::A2|method1(#this);
-static method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
+static extension-member method A2|method2<T extends core::Object? = dynamic>(lowered final self::A1 #this, self::A2|method2::T% o) → self::A1 {
   core::print(o);
   return #this;
 }
-static method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
+static extension-member method A2|get#method2(lowered final self::A1 #this) → <T extends core::Object? = dynamic>(T%) → self::A1
   return <T extends core::Object? = dynamic>(T% o) → self::A1 => self::A2|method2<T%>(#this, o);
-static method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
+static extension-member method B2|method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|method1::T%> #this) → self::B1<self::B2|method1::T%> {
   return #this;
 }
-static method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
+static extension-member method B2|get#method1<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method1::T%> #this) → () → self::B1<self::B2|get#method1::T%>
   return () → self::B1<self::B2|get#method1::T%> => self::B2|method1<self::B2|get#method1::T%>(#this);
-static method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
+static extension-member method B2|method2<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::B1<self::B2|method2::T%> #this, self::B2|method2::S% o) → self::B1<self::B2|method2::T%> {
   core::print(o);
   return #this;
 }
-static method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
+static extension-member method B2|get#method2<T extends core::Object? = dynamic>(lowered final self::B1<self::B2|get#method2::T%> #this) → <S extends core::Object? = dynamic>(S%) → self::B1<self::B2|get#method2::T%>
   return <S extends core::Object? = dynamic>(S% o) → self::B1<self::B2|get#method2::T%> => self::B2|method2<self::B2|get#method2::T%, S%>(#this, o);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.strong.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.strong.expect
index 8b563dfb7ba..35f11e27ee2 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.strong.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.strong.expect
@@ -263,8 +263,8 @@ static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic>
   function local(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
   (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → Null {};
 }
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1 = #C1, self::G<dynamic> s2 = #C1, self::G<self::Class<dynamic>> s3 = #C1, self::G<self::Class<dynamic>> s4 = #C1, self::G<self::ConcreteClass> s5 = #C1, self::G<self::Class<self::ConcreteClass>> s6 = #C1, self::G<core::Object> s7 = #C1, self::G<core::int> s8 = #C1}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.strong.transformed.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.strong.transformed.expect
index 8b563dfb7ba..35f11e27ee2 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.strong.transformed.expect
@@ -263,8 +263,8 @@ static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic>
   function local(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
   (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → Null {};
 }
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1 = #C1, self::G<dynamic> s2 = #C1, self::G<self::Class<dynamic>> s3 = #C1, self::G<self::Class<dynamic>> s4 = #C1, self::G<self::ConcreteClass> s5 = #C1, self::G<self::Class<self::ConcreteClass>> s6 = #C1, self::G<core::Object> s7 = #C1, self::G<core::int> s8 = #C1}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.expect
index 8b563dfb7ba..35f11e27ee2 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.expect
@@ -263,8 +263,8 @@ static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic>
   function local(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
   (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → Null {};
 }
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1 = #C1, self::G<dynamic> s2 = #C1, self::G<self::Class<dynamic>> s3 = #C1, self::G<self::Class<dynamic>> s4 = #C1, self::G<self::ConcreteClass> s5 = #C1, self::G<self::Class<self::ConcreteClass>> s6 = #C1, self::G<core::Object> s7 = #C1, self::G<core::int> s8 = #C1}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.modular.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.modular.expect
index 8b563dfb7ba..35f11e27ee2 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.modular.expect
@@ -263,8 +263,8 @@ static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic>
   function local(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
   (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → Null {};
 }
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1 = #C1, self::G<dynamic> s2 = #C1, self::G<self::Class<dynamic>> s3 = #C1, self::G<self::Class<dynamic>> s4 = #C1, self::G<self::ConcreteClass> s5 = #C1, self::G<self::Class<self::ConcreteClass>> s6 = #C1, self::G<core::Object> s7 = #C1, self::G<core::int> s8 = #C1}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.outline.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.outline.expect
index dfc7b27ffd8..db77efc01ed 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.outline.expect
@@ -182,9 +182,9 @@ extension Extension1 on core::int {
 }
 static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1, required self::G<dynamic> s2, required self::G<self::Class<dynamic>> s3, required self::G<self::Class<dynamic>> s4, required self::G<self::ConcreteClass> s5, required self::G<self::Class<self::ConcreteClass>> s6, required self::G<core::Object> s7, required self::G<core::int> s8}) → void
   ;
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1, required self::G<dynamic> s2, required self::G<self::Class<dynamic>> s3, required self::G<self::Class<dynamic>> s4, required self::G<self::ConcreteClass> s5, required self::G<self::Class<self::ConcreteClass>> s6, required self::G<core::Object> s7, required self::G<core::int> s8}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1, required self::G<dynamic> s2, required self::G<self::Class<dynamic>> s3, required self::G<self::Class<dynamic>> s4, required self::G<self::ConcreteClass> s5, required self::G<self::Class<self::ConcreteClass>> s6, required self::G<core::Object> s7, required self::G<core::int> s8}) → void
   ;
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1, self::G<dynamic> s2, self::G<self::Class<dynamic>> s3, self::G<self::Class<dynamic>> s4, self::G<self::ConcreteClass> s5, self::G<self::Class<self::ConcreteClass>> s6, self::G<core::Object> s7, self::G<core::int> s8}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.transformed.expect b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.transformed.expect
index 8b563dfb7ba..35f11e27ee2 100644
--- a/pkg/front_end/testcases/general/bounds_parameters.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/bounds_parameters.dart.weak.transformed.expect
@@ -263,8 +263,8 @@ static method method1(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic>
   function local(self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
   (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → Null {};
 }
-static method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
-static method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
+static extension-member method Extension1|method3(lowered final core::int #this, self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {required self::G<self::Class<dynamic>> s1 = #C1, required self::G<dynamic> s2 = #C1, required self::G<self::Class<dynamic>> s3 = #C1, required self::G<self::Class<dynamic>> s4 = #C1, required self::G<self::ConcreteClass> s5 = #C1, required self::G<self::Class<self::ConcreteClass>> s6 = #C1, required self::G<core::Object> s7 = #C1, required self::G<core::int> s8 = #C1}) → void {}
+static extension-member method Extension1|get#method3(lowered final core::int #this) → (self::Class<dynamic>, dynamic, self::Class<dynamic>, self::Class<dynamic>, self::ConcreteClass, self::Class<self::ConcreteClass>, core::Object, core::int, {s1: self::G<self::Class<dynamic>>, s2: self::G<dynamic>, s3: self::G<self::Class<dynamic>>, s4: self::G<self::Class<dynamic>>, s5: self::G<self::ConcreteClass>, s6: self::G<self::Class<self::ConcreteClass>>, s7: self::G<core::Object>, s8: self::G<core::int>}) → void
   return (self::Class<dynamic> t1, dynamic t2, self::Class<dynamic> t3, self::Class<dynamic> t4, self::ConcreteClass t5, self::Class<self::ConcreteClass> t6, core::Object t7, core::int t8, {self::G<self::Class<dynamic>> s1 = #C1, self::G<dynamic> s2 = #C1, self::G<self::Class<dynamic>> s3 = #C1, self::G<self::Class<dynamic>> s4 = #C1, self::G<self::ConcreteClass> s5 = #C1, self::G<self::Class<self::ConcreteClass>> s6 = #C1, self::G<core::Object> s7 = #C1, self::G<core::int> s8 = #C1}) → void => self::Extension1|method3(#this, t1, t2, t3, t4, t5, t6, t7, t8, s1: s1, s2: s2, s3: s3, s4: s4, s5: s5, s6: s6, s7: s7, s8: s8);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.strong.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.strong.expect
index 8e36d63f2db..a1ce6531bb5 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.strong.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.strong.expect
@@ -310,68 +310,68 @@ static method method1() → dynamic {
   function s8() → self::G<core::int>
     return throw "";
 }
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   return throw "";
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   return throw "";
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   return throw "";
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   return throw "";
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   return throw "";
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   return throw "";
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   return throw "";
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   return throw "";
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   return throw "";
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   return throw "";
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.strong.transformed.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.strong.transformed.expect
index 8e36d63f2db..a1ce6531bb5 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.strong.transformed.expect
@@ -310,68 +310,68 @@ static method method1() → dynamic {
   function s8() → self::G<core::int>
     return throw "";
 }
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   return throw "";
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   return throw "";
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   return throw "";
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   return throw "";
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   return throw "";
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   return throw "";
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   return throw "";
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   return throw "";
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   return throw "";
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   return throw "";
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.expect
index 8e36d63f2db..a1ce6531bb5 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.expect
@@ -310,68 +310,68 @@ static method method1() → dynamic {
   function s8() → self::G<core::int>
     return throw "";
 }
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   return throw "";
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   return throw "";
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   return throw "";
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   return throw "";
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   return throw "";
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   return throw "";
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   return throw "";
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   return throw "";
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   return throw "";
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   return throw "";
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.modular.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.modular.expect
index 8e36d63f2db..a1ce6531bb5 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.modular.expect
@@ -310,68 +310,68 @@ static method method1() → dynamic {
   function s8() → self::G<core::int>
     return throw "";
 }
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   return throw "";
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   return throw "";
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   return throw "";
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   return throw "";
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   return throw "";
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   return throw "";
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   return throw "";
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   return throw "";
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   return throw "";
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   return throw "";
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.outline.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.outline.expect
index f2f13b639c5..0f3b4dc9f63 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.outline.expect
@@ -236,69 +236,69 @@ static method s8() → self::G<core::int>
   ;
 static method method1() → dynamic
   ;
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   ;
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   ;
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   ;
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   ;
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   ;
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   ;
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   ;
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   ;
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   ;
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   ;
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   ;
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   ;
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   ;
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   ;
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   ;
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   ;
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.transformed.expect b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.transformed.expect
index 8e36d63f2db..a1ce6531bb5 100644
--- a/pkg/front_end/testcases/general/bounds_return_types.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/bounds_return_types.dart.weak.transformed.expect
@@ -310,68 +310,68 @@ static method method1() → dynamic {
   function s8() → self::G<core::int>
     return throw "";
 }
-static method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t1(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t1(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t1(#this);
-static method Extension1|t2(lowered final core::int #this) → dynamic
+static extension-member method Extension1|t2(lowered final core::int #this) → dynamic
   return throw "";
-static method Extension1|get#t2(lowered final core::int #this) → () → dynamic
+static extension-member method Extension1|get#t2(lowered final core::int #this) → () → dynamic
   return () → dynamic => self::Extension1|t2(#this);
-static method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t3(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t3(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t3(#this);
-static method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
+static extension-member method Extension1|t4(lowered final core::int #this) → self::Class<dynamic>
   return throw "";
-static method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
+static extension-member method Extension1|get#t4(lowered final core::int #this) → () → self::Class<dynamic>
   return () → self::Class<dynamic> => self::Extension1|t4(#this);
-static method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
+static extension-member method Extension1|t5(lowered final core::int #this) → self::ConcreteClass
   return throw "";
-static method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
+static extension-member method Extension1|get#t5(lowered final core::int #this) → () → self::ConcreteClass
   return () → self::ConcreteClass => self::Extension1|t5(#this);
-static method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
+static extension-member method Extension1|t6(lowered final core::int #this) → self::Class<self::ConcreteClass>
   return throw "";
-static method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
+static extension-member method Extension1|get#t6(lowered final core::int #this) → () → self::Class<self::ConcreteClass>
   return () → self::Class<self::ConcreteClass> => self::Extension1|t6(#this);
-static method Extension1|t7(lowered final core::int #this) → core::Object
+static extension-member method Extension1|t7(lowered final core::int #this) → core::Object
   return throw "";
-static method Extension1|get#t7(lowered final core::int #this) → () → core::Object
+static extension-member method Extension1|get#t7(lowered final core::int #this) → () → core::Object
   return () → core::Object => self::Extension1|t7(#this);
-static method Extension1|t8(lowered final core::int #this) → core::int
+static extension-member method Extension1|t8(lowered final core::int #this) → core::int
   return throw "";
-static method Extension1|get#t8(lowered final core::int #this) → () → core::int
+static extension-member method Extension1|get#t8(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension1|t8(#this);
-static method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s1(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s1(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s1(#this);
-static method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
+static extension-member method Extension1|s2(lowered final core::int #this) → self::G<dynamic>
   return throw "";
-static method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
+static extension-member method Extension1|get#s2(lowered final core::int #this) → () → self::G<dynamic>
   return () → self::G<dynamic> => self::Extension1|s2(#this);
-static method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s3(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s3(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s3(#this);
-static method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
+static extension-member method Extension1|s4(lowered final core::int #this) → self::G<self::Class<dynamic>>
   return throw "";
-static method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
+static extension-member method Extension1|get#s4(lowered final core::int #this) → () → self::G<self::Class<dynamic>>
   return () → self::G<self::Class<dynamic>> => self::Extension1|s4(#this);
-static method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
+static extension-member method Extension1|s5(lowered final core::int #this) → self::G<self::ConcreteClass>
   return throw "";
-static method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
+static extension-member method Extension1|get#s5(lowered final core::int #this) → () → self::G<self::ConcreteClass>
   return () → self::G<self::ConcreteClass> => self::Extension1|s5(#this);
-static method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|s6(lowered final core::int #this) → self::G<self::Class<self::ConcreteClass>>
   return throw "";
-static method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
+static extension-member method Extension1|get#s6(lowered final core::int #this) → () → self::G<self::Class<self::ConcreteClass>>
   return () → self::G<self::Class<self::ConcreteClass>> => self::Extension1|s6(#this);
-static method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
+static extension-member method Extension1|s7(lowered final core::int #this) → self::G<core::Object>
   return throw "";
-static method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
+static extension-member method Extension1|get#s7(lowered final core::int #this) → () → self::G<core::Object>
   return () → self::G<core::Object> => self::Extension1|s7(#this);
-static method Extension1|s8(lowered final core::int #this) → self::G<core::int>
+static extension-member method Extension1|s8(lowered final core::int #this) → self::G<core::int>
   return throw "";
-static method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
+static extension-member method Extension1|get#s8(lowered final core::int #this) → () → self::G<core::int>
   return () → self::G<core::int> => self::Extension1|s8(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.expect
index f43147c62f4..0c6cff9a50c 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.transformed.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.transformed.expect
index f43147c62f4..0c6cff9a50c 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.strong.transformed.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.expect
index f43147c62f4..0c6cff9a50c 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.modular.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.modular.expect
index f43147c62f4..0c6cff9a50c 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.modular.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.outline.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.outline.expect
index 815a6b61728..2cac0d288d5 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.outline.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a}) → void
   ;
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.transformed.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.transformed.expect
index f43147c62f4..0c6cff9a50c 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure.dart.weak.transformed.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.expect
index 26d5b4e3c2b..2184a767c24 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.transformed.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.transformed.expect
index 26d5b4e3c2b..2184a767c24 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.strong.transformed.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.expect
index 26d5b4e3c2b..2184a767c24 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.modular.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.modular.expect
index 26d5b4e3c2b..2184a767c24 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.modular.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.outline.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.outline.expect
index 83d44de7c11..04e175d2c71 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.outline.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a}) → void
   ;
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.transformed.expect b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.transformed.expect
index 26d5b4e3c2b..2184a767c24 100644
--- a/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/error_recovery/weekly_bot_91_failure_variation_1.dart.weak.transformed.expect
@@ -8,9 +8,9 @@ extension /* unnamed */ _extension#0 on core::int {
   method _foo = self::_extension#0|_foo;
   tearoff _foo = self::_extension#0|get#_foo;
 }
-static method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
+static extension-member method _extension#0|_foo<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_foo::T%) → void x, {required self::_extension#0|_foo::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_foo(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_foo<T%>(#this, x, a: a);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.strong.expect b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.strong.expect
index 455a7feab7d..d69a71b4a84 100644
--- a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.strong.expect
+++ b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.strong.expect
@@ -382,46 +382,46 @@ extension Extension<T extends core::num*, S extends T* = core::num*> on core::in
   static set property8b = set self::Extension|property8b;
   static set property9 = set self::Extension|property9;
 }
-static method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
+static extension-member method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
   return 0;
-static method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
-static method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
+static extension-member method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
+static extension-member method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:135:22: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
-static method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
+static extension-member method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
+static extension-member method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:138:23: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property5a => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
-static method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
+static extension-member method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
+static extension-member method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:141:23: Error: A value of type 'int' can't be assigned to a variable of type 'T'.
   T get property5b => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
-static method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
+static extension-member method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
-static get Extension|property7() → core::int*
+static extension-member method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
+static extension-member get Extension|property7() → core::int*
   return 0;
-static set Extension|property7(core::int* value) → void {}
-static get Extension|property8a() → core::int*
+static extension-member set Extension|property7(core::int* value) → void {}
+static extension-member get Extension|property8a() → core::int*
   return 0;
-static set Extension|property8a(core::num* value) → void {}
-static get Extension|property8b() → core::num*
+static extension-member set Extension|property8a(core::num* value) → void {}
+static extension-member get Extension|property8b() → core::num*
   return 0;
-static set Extension|property8b(core::int* value) → void {}
-static get Extension|property9() → core::num*
+static extension-member set Extension|property8b(core::int* value) → void {}
+static extension-member get Extension|property9() → core::num*
   return 0;
-static set Extension|property9(core::String* value) → void {}
+static extension-member set Extension|property9(core::String* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.expect b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.expect
index 8d7ec547a4e..3efa453a008 100644
--- a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.expect
+++ b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.expect
@@ -378,46 +378,46 @@ extension Extension<T extends core::num*, S extends T* = core::num*> on core::in
   static set property8b = set self::Extension|property8b;
   static set property9 = set self::Extension|property9;
 }
-static method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
+static extension-member method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
   return 0;
-static method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
-static method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
+static extension-member method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
+static extension-member method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:135:22: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
-static method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
+static extension-member method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
+static extension-member method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:138:23: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property5a => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
-static method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
+static extension-member method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
+static extension-member method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:141:23: Error: A value of type 'int' can't be assigned to a variable of type 'T'.
   T get property5b => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
-static method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
+static extension-member method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
-static get Extension|property7() → core::int*
+static extension-member method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
+static extension-member get Extension|property7() → core::int*
   return 0;
-static set Extension|property7(core::int* value) → void {}
-static get Extension|property8a() → core::int*
+static extension-member set Extension|property7(core::int* value) → void {}
+static extension-member get Extension|property8a() → core::int*
   return 0;
-static set Extension|property8a(core::num* value) → void {}
-static get Extension|property8b() → core::num*
+static extension-member set Extension|property8a(core::num* value) → void {}
+static extension-member get Extension|property8b() → core::num*
   return 0;
-static set Extension|property8b(core::int* value) → void {}
-static get Extension|property9() → core::num*
+static extension-member set Extension|property8b(core::int* value) → void {}
+static extension-member get Extension|property9() → core::num*
   return 0;
-static set Extension|property9(core::String* value) → void {}
+static extension-member set Extension|property9(core::String* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.modular.expect b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.modular.expect
index 8d7ec547a4e..3efa453a008 100644
--- a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.modular.expect
@@ -378,46 +378,46 @@ extension Extension<T extends core::num*, S extends T* = core::num*> on core::in
   static set property8b = set self::Extension|property8b;
   static set property9 = set self::Extension|property9;
 }
-static method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
+static extension-member method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
   return 0;
-static method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
   return 0;
-static method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
-static method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void {}
+static extension-member method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
-static method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
+static extension-member method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void {}
+static extension-member method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:135:22: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
-static method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
+static extension-member method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void {}
+static extension-member method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:138:23: Error: A value of type 'int' can't be assigned to a variable of type 'S'.
   S get property5a => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
-static method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
+static extension-member method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void {}
+static extension-member method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
   return invalid-expression "pkg/front_end/testcases/general/getter_vs_setter_type.dart:141:23: Error: A value of type 'int' can't be assigned to a variable of type 'T'.
   T get property5b => 0; // ok
                       ^" in 0 as{TypeError,ForLegacy} Never;
-static method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
-static method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void {}
+static extension-member method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
   return "";
-static method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
-static get Extension|property7() → core::int*
+static extension-member method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void {}
+static extension-member get Extension|property7() → core::int*
   return 0;
-static set Extension|property7(core::int* value) → void {}
-static get Extension|property8a() → core::int*
+static extension-member set Extension|property7(core::int* value) → void {}
+static extension-member get Extension|property8a() → core::int*
   return 0;
-static set Extension|property8a(core::num* value) → void {}
-static get Extension|property8b() → core::num*
+static extension-member set Extension|property8a(core::num* value) → void {}
+static extension-member get Extension|property8b() → core::num*
   return 0;
-static set Extension|property8b(core::int* value) → void {}
-static get Extension|property9() → core::num*
+static extension-member set Extension|property8b(core::int* value) → void {}
+static extension-member get Extension|property9() → core::num*
   return 0;
-static set Extension|property9(core::String* value) → void {}
+static extension-member set Extension|property9(core::String* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.outline.expect b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.outline.expect
index 0dccb6ec869..ffb53d2cdc6 100644
--- a/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/getter_vs_setter_type.dart.weak.outline.expect
@@ -361,53 +361,53 @@ extension Extension<T extends core::num*, S extends T* = core::num*> on core::in
   static set property8b = set self::Extension|property8b;
   static set property9 = set self::Extension|property9;
 }
-static method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|get#property1<T extends core::num*, S extends self::Extension|get#property1::T* = core::num*>(lowered final core::int* #this) → core::int*
   ;
-static method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
+static extension-member method Extension|set#property1<T extends core::num*, S extends self::Extension|set#property1::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
   ;
-static method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
+static extension-member method Extension|get#property2a<T extends core::num*, S extends self::Extension|get#property2a::T* = core::num*>(lowered final core::int* #this) → core::num*
   ;
-static method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
+static extension-member method Extension|set#property2a<T extends core::num*, S extends self::Extension|set#property2a::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
   ;
-static method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
+static extension-member method Extension|get#property2b<T extends core::num*, S extends self::Extension|get#property2b::T* = core::num*>(lowered final core::int* #this) → core::int*
   ;
-static method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void
+static extension-member method Extension|set#property2b<T extends core::num*, S extends self::Extension|set#property2b::T* = core::num*>(lowered final core::int* #this, core::num* i) → void
   ;
-static method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|get#property3<T extends core::num*, S extends self::Extension|get#property3::T* = core::num*>(lowered final core::int* #this) → core::String*
   ;
-static method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
+static extension-member method Extension|set#property3<T extends core::num*, S extends self::Extension|set#property3::T* = core::num*>(lowered final core::int* #this, core::int* i) → void
   ;
-static method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
+static extension-member method Extension|get#property4<T extends core::num*, S extends self::Extension|get#property4::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property4::S*
   ;
-static method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void
+static extension-member method Extension|set#property4<T extends core::num*, S extends self::Extension|set#property4::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property4::S* i) → void
   ;
-static method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
+static extension-member method Extension|get#property5a<T extends core::num*, S extends self::Extension|get#property5a::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5a::S*
   ;
-static method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void
+static extension-member method Extension|set#property5a<T extends core::num*, S extends self::Extension|set#property5a::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5a::T* i) → void
   ;
-static method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
+static extension-member method Extension|get#property5b<T extends core::num*, S extends self::Extension|get#property5b::T* = core::num*>(lowered final core::int* #this) → self::Extension|get#property5b::T*
   ;
-static method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void
+static extension-member method Extension|set#property5b<T extends core::num*, S extends self::Extension|set#property5b::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property5b::S* i) → void
   ;
-static method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
+static extension-member method Extension|get#property6<T extends core::num*, S extends self::Extension|get#property6::T* = core::num*>(lowered final core::int* #this) → core::String*
   ;
-static method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void
+static extension-member method Extension|set#property6<T extends core::num*, S extends self::Extension|set#property6::T* = core::num*>(lowered final core::int* #this, self::Extension|set#property6::S* i) → void
   ;
-static get Extension|property7() → core::int*
+static extension-member get Extension|property7() → core::int*
   ;
-static set Extension|property7(core::int* value) → void
+static extension-member set Extension|property7(core::int* value) → void
   ;
-static get Extension|property8a() → core::int*
+static extension-member get Extension|property8a() → core::int*
   ;
-static set Extension|property8a(core::num* value) → void
+static extension-member set Extension|property8a(core::num* value) → void
   ;
-static get Extension|property8b() → core::num*
+static extension-member get Extension|property8b() → core::num*
   ;
-static set Extension|property8b(core::int* value) → void
+static extension-member set Extension|property8b(core::int* value) → void
   ;
-static get Extension|property9() → core::num*
+static extension-member get Extension|property9() → core::num*
   ;
-static set Extension|property9(core::String* value) → void
+static extension-member set Extension|property9(core::String* value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue40242.dart.strong.expect b/pkg/front_end/testcases/general/issue40242.dart.strong.expect
index 41ed414c331..a85096eaa42 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.strong.expect
@@ -30,12 +30,12 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic {
+static extension-member method E|errors(lowered final self::C #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue40242.dart:9:5: Error: Can't assign to 'this'.
     this = new C();
     ^^^^";
 }
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic {
   final self::C c1 = new self::C::•();
diff --git a/pkg/front_end/testcases/general/issue40242.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue40242.dart.strong.transformed.expect
index 704bba4922b..daaf984e672 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.strong.transformed.expect
@@ -30,12 +30,12 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic {
+static extension-member method E|errors(lowered final self::C #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue40242.dart:9:5: Error: Can't assign to 'this'.
     this = new C();
     ^^^^";
 }
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic {
   final self::C c1 = new self::C::•();
diff --git a/pkg/front_end/testcases/general/issue40242.dart.weak.expect b/pkg/front_end/testcases/general/issue40242.dart.weak.expect
index 41ed414c331..a85096eaa42 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.weak.expect
@@ -30,12 +30,12 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic {
+static extension-member method E|errors(lowered final self::C #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue40242.dart:9:5: Error: Can't assign to 'this'.
     this = new C();
     ^^^^";
 }
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic {
   final self::C c1 = new self::C::•();
diff --git a/pkg/front_end/testcases/general/issue40242.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue40242.dart.weak.modular.expect
index 41ed414c331..a85096eaa42 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.weak.modular.expect
@@ -30,12 +30,12 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic {
+static extension-member method E|errors(lowered final self::C #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue40242.dart:9:5: Error: Can't assign to 'this'.
     this = new C();
     ^^^^";
 }
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic {
   final self::C c1 = new self::C::•();
diff --git a/pkg/front_end/testcases/general/issue40242.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue40242.dart.weak.outline.expect
index 1885efd7cf3..4e124bc2fbe 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.weak.outline.expect
@@ -10,9 +10,9 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic
+static extension-member method E|errors(lowered final self::C #this) → dynamic
   ;
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue40242.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue40242.dart.weak.transformed.expect
index 704bba4922b..daaf984e672 100644
--- a/pkg/front_end/testcases/general/issue40242.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue40242.dart.weak.transformed.expect
@@ -30,12 +30,12 @@ extension E on self::C {
   method errors = self::E|errors;
   tearoff errors = self::E|get#errors;
 }
-static method E|errors(lowered final self::C #this) → dynamic {
+static extension-member method E|errors(lowered final self::C #this) → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue40242.dart:9:5: Error: Can't assign to 'this'.
     this = new C();
     ^^^^";
 }
-static method E|get#errors(lowered final self::C #this) → () → dynamic
+static extension-member method E|get#errors(lowered final self::C #this) → () → dynamic
   return () → dynamic => self::E|errors(#this);
 static method errors() → dynamic {
   final self::C c1 = new self::C::•();
diff --git a/pkg/front_end/testcases/general/issue42435.dart.strong.expect b/pkg/front_end/testcases/general/issue42435.dart.strong.expect
index 21067d89c96..202ecb2e5b3 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.strong.expect
@@ -186,14 +186,14 @@ static method bar3() → <Z extends self::A<self::A<dynamic>> = dynamic>() → d
 static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue42435.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue42435.dart.strong.transformed.expect
index 21067d89c96..202ecb2e5b3 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.strong.transformed.expect
@@ -186,14 +186,14 @@ static method bar3() → <Z extends self::A<self::A<dynamic>> = dynamic>() → d
 static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue42435.dart.weak.expect b/pkg/front_end/testcases/general/issue42435.dart.weak.expect
index 07aa54ed311..4c29e25c8a8 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.weak.expect
@@ -187,14 +187,14 @@ static method bar3() → <Z extends self::A<self::A<dynamic>> = dynamic>() → d
 static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue42435.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue42435.dart.weak.modular.expect
index 07aa54ed311..4c29e25c8a8 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.weak.modular.expect
@@ -187,14 +187,14 @@ static method bar3() → <Z extends self::A<self::A<dynamic>> = dynamic>() → d
 static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue42435.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue42435.dart.weak.outline.expect
index 116a0e0c202..6081ffef765 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.weak.outline.expect
@@ -188,17 +188,17 @@ static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dyna
   ;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void
   ;
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic
   ;
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   ;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   ;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue42435.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue42435.dart.weak.transformed.expect
index 07aa54ed311..4c29e25c8a8 100644
--- a/pkg/front_end/testcases/general/issue42435.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue42435.dart.weak.transformed.expect
@@ -187,14 +187,14 @@ static method bar3() → <Z extends self::A<self::A<dynamic>> = dynamic>() → d
 static get bar4() → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
 static set bar5(<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
-static method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
-static method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
+static extension-member method E|baz2(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic {}
+static extension-member method E|get#baz2(lowered final core::int #this) → (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic) → dynamic
   return (<Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → dynamic => self::E|baz2(#this, a);
-static method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|baz3(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz3(lowered final core::int #this) → () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return () → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic => self::E|baz3(#this);
-static method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
+static extension-member method E|get#baz4(lowered final core::int #this) → <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic
   return throw 42;
-static method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
+static extension-member method E|set#baz5(lowered final core::int #this, <Z extends self::A<self::A<dynamic>> = dynamic>() → dynamic a) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue43401.dart.strong.expect b/pkg/front_end/testcases/general/issue43401.dart.strong.expect
index 206a343472f..fd300131c44 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.strong.expect
@@ -22,7 +22,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   return f(#this){(self::Test|>>::S%) → self::Test|>>::T%};
 static method test() → void {
   core::Object o = new core::Object::•();
diff --git a/pkg/front_end/testcases/general/issue43401.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue43401.dart.strong.transformed.expect
index 206a343472f..fd300131c44 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.strong.transformed.expect
@@ -22,7 +22,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   return f(#this){(self::Test|>>::S%) → self::Test|>>::T%};
 static method test() → void {
   core::Object o = new core::Object::•();
diff --git a/pkg/front_end/testcases/general/issue43401.dart.weak.expect b/pkg/front_end/testcases/general/issue43401.dart.weak.expect
index 206a343472f..fd300131c44 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.weak.expect
@@ -22,7 +22,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   return f(#this){(self::Test|>>::S%) → self::Test|>>::T%};
 static method test() → void {
   core::Object o = new core::Object::•();
diff --git a/pkg/front_end/testcases/general/issue43401.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue43401.dart.weak.modular.expect
index 206a343472f..fd300131c44 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.weak.modular.expect
@@ -22,7 +22,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   return f(#this){(self::Test|>>::S%) → self::Test|>>::T%};
 static method test() → void {
   core::Object o = new core::Object::•();
diff --git a/pkg/front_end/testcases/general/issue43401.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue43401.dart.weak.outline.expect
index 7c2910e9fc5..92314aec65c 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   ;
 static method test() → void
   ;
diff --git a/pkg/front_end/testcases/general/issue43401.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue43401.dart.weak.transformed.expect
index 206a343472f..fd300131c44 100644
--- a/pkg/front_end/testcases/general/issue43401.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue43401.dart.weak.transformed.expect
@@ -22,7 +22,7 @@ import "dart:core" as core;
 extension Test<S extends core::Object? = dynamic, T extends core::Object? = dynamic> on S% {
   operator >> = self::Test|>>;
 }
-static method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
+static extension-member method Test|>><S extends core::Object? = dynamic, T extends core::Object? = dynamic>(lowered final self::Test|>>::S% #this, (self::Test|>>::S%) → self::Test|>>::T% f) → self::Test|>>::T%
   return f(#this){(self::Test|>>::S%) → self::Test|>>::T%};
 static method test() → void {
   core::Object o = new core::Object::•();
diff --git a/pkg/front_end/testcases/general/issue45204.dart.strong.expect b/pkg/front_end/testcases/general/issue45204.dart.strong.expect
index 0a7b98afa7e..e6633be6c90 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.strong.expect
@@ -131,14 +131,14 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void {}
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void {}
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue45204.dart:15:9: Error: Too few positional arguments: 1 required, 0 given.
diff --git a/pkg/front_end/testcases/general/issue45204.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue45204.dart.strong.transformed.expect
index 0a7b98afa7e..e6633be6c90 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.strong.transformed.expect
@@ -131,14 +131,14 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void {}
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void {}
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue45204.dart:15:9: Error: Too few positional arguments: 1 required, 0 given.
diff --git a/pkg/front_end/testcases/general/issue45204.dart.weak.expect b/pkg/front_end/testcases/general/issue45204.dart.weak.expect
index 0a7b98afa7e..e6633be6c90 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.weak.expect
@@ -131,14 +131,14 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void {}
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void {}
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue45204.dart:15:9: Error: Too few positional arguments: 1 required, 0 given.
diff --git a/pkg/front_end/testcases/general/issue45204.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue45204.dart.weak.modular.expect
index 0a7b98afa7e..e6633be6c90 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.weak.modular.expect
@@ -131,14 +131,14 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void {}
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void {}
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue45204.dart:15:9: Error: Too few positional arguments: 1 required, 0 given.
diff --git a/pkg/front_end/testcases/general/issue45204.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue45204.dart.weak.outline.expect
index 55935fa19c6..beeae6f75a0 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.weak.outline.expect
@@ -12,17 +12,17 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void
   ;
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void
   ;
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void
   ;
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue45204.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue45204.dart.weak.transformed.expect
index 0a7b98afa7e..e6633be6c90 100644
--- a/pkg/front_end/testcases/general/issue45204.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue45204.dart.weak.transformed.expect
@@ -131,14 +131,14 @@ extension S2<X extends core::Object? = dynamic> on core::int {
   method test3 = self::S2|test3;
   tearoff test3 = self::S2|get#test3;
 }
-static method S|test(lowered final core::int #this, core::int x) → void {}
-static method S|get#test(lowered final core::int #this) → (core::int) → void
+static extension-member method S|test(lowered final core::int #this, core::int x) → void {}
+static extension-member method S|get#test(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S|test(#this, x);
-static method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
-static method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
+static extension-member method S2|test2<X extends core::Object? = dynamic>(lowered final core::int #this, core::int x) → void {}
+static extension-member method S2|get#test2<X extends core::Object? = dynamic>(lowered final core::int #this) → (core::int) → void
   return (core::int x) → void => self::S2|test2<self::S2|get#test2::X%>(#this, x);
-static method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
-static method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
+static extension-member method S2|test3<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(lowered final core::int #this, self::S2|test3::Y% y) → void {}
+static extension-member method S2|get#test3<X extends core::Object? = dynamic>(lowered final core::int #this) → <Y extends core::Object? = dynamic>(Y%) → void
   return <Y extends core::Object? = dynamic>(Y% y) → void => self::S2|test3<self::S2|get#test3::X%, Y%>(#this, y);
 static method foo() → dynamic {
   invalid-expression "pkg/front_end/testcases/general/issue45204.dart:15:9: Error: Too few positional arguments: 1 required, 0 given.
diff --git a/pkg/front_end/testcases/general/issue45834.dart.strong.expect b/pkg/front_end/testcases/general/issue45834.dart.strong.expect
index eace4a77c4e..474d6d991bc 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.strong.expect
@@ -202,14 +202,14 @@ static method foo4() → <X extends (<T extends core::Object* = dynamic>() →*
 static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue45834.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue45834.dart.strong.transformed.expect
index eace4a77c4e..474d6d991bc 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.strong.transformed.expect
@@ -202,14 +202,14 @@ static method foo4() → <X extends (<T extends core::Object* = dynamic>() →*
 static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue45834.dart.weak.expect b/pkg/front_end/testcases/general/issue45834.dart.weak.expect
index f6c8f8a9458..6fd18fb4838 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.weak.expect
@@ -198,14 +198,14 @@ static method foo4() → <X extends (<T extends core::Object* = dynamic>() →*
 static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue45834.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue45834.dart.weak.modular.expect
index f6c8f8a9458..6fd18fb4838 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.weak.modular.expect
@@ -198,14 +198,14 @@ static method foo4() → <X extends (<T extends core::Object* = dynamic>() →*
 static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue45834.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue45834.dart.weak.outline.expect
index f272ccf6319..9036206ea4e 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.weak.outline.expect
@@ -199,17 +199,17 @@ static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dy
   ;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void
   ;
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic
   ;
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   ;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   ;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue45834.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue45834.dart.weak.transformed.expect
index f6c8f8a9458..6fd18fb4838 100644
--- a/pkg/front_end/testcases/general/issue45834.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue45834.dart.weak.transformed.expect
@@ -198,14 +198,14 @@ static method foo4() → <X extends (<T extends core::Object* = dynamic>() →*
 static get corge1() → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
 static set grault1(<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
-static method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
-static method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
+static extension-member method E1|bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic {}
+static extension-member method E1|get#bar3<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic) →* dynamic
   return (<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic f) → dynamic => self::E1|bar3<self::E1|get#bar3::X*>(#this, f);
-static method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#bar4<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → () →* <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return () → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic => self::E1|bar4<self::E1|get#bar4::X*>(#this);
-static method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
+static extension-member method E1|get#baz2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this) → <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic
   return throw 42;
-static method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
+static extension-member method E1|set#qux2<X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>(lowered final self::B1* #this, <X extends <T extends core::Object* = dynamic>() →* dynamic = dynamic>() →* dynamic value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/issue46719.dart.strong.expect b/pkg/front_end/testcases/general/issue46719.dart.strong.expect
index d59062ea2f3..6c81026eff0 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.strong.expect
@@ -85,9 +85,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   self::A<dynamic> a = new self::A::•<dynamic>();
diff --git a/pkg/front_end/testcases/general/issue46719.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue46719.dart.strong.transformed.expect
index 766aca04c65..a8c23637e72 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.strong.transformed.expect
@@ -85,9 +85,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return core::_GrowableList::_literal1<self::m::X%>(x);
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   self::A<dynamic> a = new self::A::•<dynamic>();
diff --git a/pkg/front_end/testcases/general/issue46719.dart.weak.expect b/pkg/front_end/testcases/general/issue46719.dart.weak.expect
index 8929f086f7d..a18f12b2dca 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.weak.expect
@@ -85,9 +85,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   self::A<dynamic> a = new self::A::•<dynamic>();
diff --git a/pkg/front_end/testcases/general/issue46719.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue46719.dart.weak.modular.expect
index 8929f086f7d..a18f12b2dca 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.weak.modular.expect
@@ -85,9 +85,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return <self::m::X%>[x];
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   self::A<dynamic> a = new self::A::•<dynamic>();
diff --git a/pkg/front_end/testcases/general/issue46719.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue46719.dart.weak.outline.expect
index 4c8e7ba6c96..bf702b14b0c 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.weak.outline.expect
@@ -20,9 +20,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   ;
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   ;
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue46719.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue46719.dart.weak.transformed.expect
index c0872f3e1ec..e319efb70e3 100644
--- a/pkg/front_end/testcases/general/issue46719.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue46719.dart.weak.transformed.expect
@@ -85,9 +85,9 @@ extension FunctionApplier on core::Function {
 }
 static method m<X extends core::Object? = dynamic>(self::m::X% x) → core::List<self::m::X%>
   return core::_GrowableList::_literal1<self::m::X%>(x);
-static method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
+static extension-member method FunctionApplier|applyAndPrint(lowered final core::Function #this, core::List<core::Object?> positionalArguments) → void
   return core::print(core::Function::apply(#this, positionalArguments, #C1));
-static method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
+static extension-member method FunctionApplier|get#applyAndPrint(lowered final core::Function #this) → (core::List<core::Object?>) → void
   return (core::List<core::Object?> positionalArguments) → void => self::FunctionApplier|applyAndPrint(#this, positionalArguments);
 static method test() → dynamic {
   self::A<dynamic> a = new self::A::•<dynamic>();
diff --git a/pkg/front_end/testcases/general/issue48765.dart.strong.expect b/pkg/front_end/testcases/general/issue48765.dart.strong.expect
index 61f4218947c..4847d31f04a 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.strong.expect
@@ -40,13 +40,13 @@ static method main() → void {
   self::_extension#0|method(new self::_Ac::•());
   self::_extension#1|method(new self::_Bc::•());
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
   self::_extension#0|field = self::_extension#0|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
   self::_extension#1|field = self::_extension#1|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48765.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue48765.dart.strong.transformed.expect
index 61f4218947c..4847d31f04a 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.strong.transformed.expect
@@ -40,13 +40,13 @@ static method main() → void {
   self::_extension#0|method(new self::_Ac::•());
   self::_extension#1|method(new self::_Bc::•());
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
   self::_extension#0|field = self::_extension#0|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
   self::_extension#1|field = self::_extension#1|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48765.dart.weak.expect b/pkg/front_end/testcases/general/issue48765.dart.weak.expect
index 61f4218947c..4847d31f04a 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.weak.expect
@@ -40,13 +40,13 @@ static method main() → void {
   self::_extension#0|method(new self::_Ac::•());
   self::_extension#1|method(new self::_Bc::•());
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
   self::_extension#0|field = self::_extension#0|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
   self::_extension#1|field = self::_extension#1|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48765.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue48765.dart.weak.modular.expect
index 61f4218947c..4847d31f04a 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.weak.modular.expect
@@ -40,13 +40,13 @@ static method main() → void {
   self::_extension#0|method(new self::_Ac::•());
   self::_extension#1|method(new self::_Bc::•());
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
   self::_extension#0|field = self::_extension#0|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
   self::_extension#1|field = self::_extension#1|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48765.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue48765.dart.weak.outline.expect
index 72098161b24..91c674db670 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.weak.outline.expect
@@ -34,11 +34,11 @@ static field core::int _extension#0|field /* from org-dartlang-testcase:///issue
 static field core::int _extension#1|field /* from org-dartlang-testcase:///issue48765_part2.dart */;
 static method main() → void
   ;
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void
   ;
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void
   ;
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48765.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue48765.dart.weak.transformed.expect
index 61f4218947c..4847d31f04a 100644
--- a/pkg/front_end/testcases/general/issue48765.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue48765.dart.weak.transformed.expect
@@ -40,13 +40,13 @@ static method main() → void {
   self::_extension#0|method(new self::_Ac::•());
   self::_extension#1|method(new self::_Bc::•());
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|method(lowered final self::_A #this) → void {
   self::_extension#0|field = self::_extension#0|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part1.dart */ _extension#0|get#method(lowered final self::_A #this) → () → void
   return () → void => self::_extension#0|method(#this);
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|method(lowered final self::_B #this) → void {
   self::_extension#1|field = self::_extension#1|field.{core::num::+}(1){(core::num) → core::int};
 }
-static method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///issue48765_part2.dart */ _extension#1|get#method(lowered final self::_B #this) → () → void
   return () → void => self::_extension#1|method(#this);
diff --git a/pkg/front_end/testcases/general/issue48834.dart.strong.expect b/pkg/front_end/testcases/general/issue48834.dart.strong.expect
index f7ececbb970..c51abfc080a 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.strong.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   return 0;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   return 1;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void {
   core::List<dynamic> l = <dynamic>[];
diff --git a/pkg/front_end/testcases/general/issue48834.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue48834.dart.strong.transformed.expect
index edf924ee0aa..4393f62ba9a 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.strong.transformed.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   return 0;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   return 1;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void {
   core::List<dynamic> l = core::_GrowableList::•<dynamic>(0);
diff --git a/pkg/front_end/testcases/general/issue48834.dart.weak.expect b/pkg/front_end/testcases/general/issue48834.dart.weak.expect
index f7ececbb970..c51abfc080a 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.weak.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   return 0;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   return 1;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void {
   core::List<dynamic> l = <dynamic>[];
diff --git a/pkg/front_end/testcases/general/issue48834.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue48834.dart.weak.modular.expect
index f7ececbb970..c51abfc080a 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.weak.modular.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   return 0;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   return 1;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void {
   core::List<dynamic> l = <dynamic>[];
diff --git a/pkg/front_end/testcases/general/issue48834.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue48834.dart.weak.outline.expect
index 8f27259a54d..21926ac17ce 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.weak.outline.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   ;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   ;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/general/issue48834.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue48834.dart.weak.transformed.expect
index edf924ee0aa..4393f62ba9a 100644
--- a/pkg/front_end/testcases/general/issue48834.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue48834.dart.weak.transformed.expect
@@ -10,13 +10,13 @@ extension HashAllList on core::List<dynamic> {
   method hashAll = self::HashAllList|hashAll;
   tearoff hashAll = self::HashAllList|get#hashAll;
 }
-static method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
+static extension-member method HashAll|hashAll(lowered final core::Iterable<dynamic> #this) → core::int
   return 0;
-static method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
+static extension-member method HashAll|get#hashAll(lowered final core::Iterable<dynamic> #this) → () → core::int
   return () → core::int => self::HashAll|hashAll(#this);
-static method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
+static extension-member method HashAllList|hashAll(lowered final core::List<dynamic> #this) → core::int
   return 1;
-static method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
+static extension-member method HashAllList|get#hashAll(lowered final core::List<dynamic> #this) → () → core::int
   return () → core::int => self::HashAllList|hashAll(#this);
 static method main() → void {
   core::List<dynamic> l = core::_GrowableList::•<dynamic>(0);
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.strong.expect b/pkg/front_end/testcases/general/issue_46886.dart.strong.expect
index 6b531785be4..66806512511 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.strong.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.strong.expect
@@ -75,11 +75,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   return "Greater Than used";
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   return "Called";
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic {
   self::Foo foo = new self::Foo::•();
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.strong.transformed.expect b/pkg/front_end/testcases/general/issue_46886.dart.strong.transformed.expect
index 2de810d4fa8..8a3eea707bb 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.strong.transformed.expect
@@ -75,11 +75,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   return "Greater Than used";
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   return "Called";
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic {
   self::Foo foo = new self::Foo::•();
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.weak.expect b/pkg/front_end/testcases/general/issue_46886.dart.weak.expect
index 6b531785be4..66806512511 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.weak.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.weak.expect
@@ -75,11 +75,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   return "Greater Than used";
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   return "Called";
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic {
   self::Foo foo = new self::Foo::•();
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.weak.modular.expect b/pkg/front_end/testcases/general/issue_46886.dart.weak.modular.expect
index 6b531785be4..66806512511 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.weak.modular.expect
@@ -75,11 +75,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   return "Greater Than used";
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   return "Called";
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic {
   self::Foo foo = new self::Foo::•();
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.weak.outline.expect b/pkg/front_end/testcases/general/issue_46886.dart.weak.outline.expect
index 128c826fc62..b6b659df658 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.weak.outline.expect
@@ -28,11 +28,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   ;
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   ;
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/issue_46886.dart.weak.transformed.expect b/pkg/front_end/testcases/general/issue_46886.dart.weak.transformed.expect
index 2de810d4fa8..8a3eea707bb 100644
--- a/pkg/front_end/testcases/general/issue_46886.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/issue_46886.dart.weak.transformed.expect
@@ -75,11 +75,11 @@ extension /* unnamed */ _extension#0 on core::Symbol {
   method call = self::_extension#0|call;
   tearoff call = self::_extension#0|get#call;
 }
-static method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|>(lowered final core::Symbol #this, dynamic _) → core::String
   return "Greater Than used";
-static method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
+static extension-member method _extension#0|call(lowered final core::Symbol #this, dynamic _) → core::String
   return "Called";
-static method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
+static extension-member method _extension#0|get#call(lowered final core::Symbol #this) → (dynamic) → core::String
   return (dynamic _) → core::String => self::_extension#0|call(#this, _);
 static method main() → dynamic {
   self::Foo foo = new self::Foo::•();
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.strong.expect b/pkg/front_end/testcases/general/new_as_selector.dart.strong.expect
index 2c634a23298..edfefbe758f 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.strong.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.strong.expect
@@ -363,10 +363,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.strong.transformed.expect b/pkg/front_end/testcases/general/new_as_selector.dart.strong.transformed.expect
index 8e7949253b7..a675ca4c868 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.strong.transformed.expect
@@ -363,10 +363,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.weak.expect b/pkg/front_end/testcases/general/new_as_selector.dart.weak.expect
index 2c634a23298..edfefbe758f 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.weak.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.weak.expect
@@ -363,10 +363,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.weak.modular.expect b/pkg/front_end/testcases/general/new_as_selector.dart.weak.modular.expect
index 2c634a23298..edfefbe758f 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.weak.modular.expect
@@ -363,10 +363,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.weak.outline.expect b/pkg/front_end/testcases/general/new_as_selector.dart.weak.outline.expect
index ac35850831e..da1892102d9 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.weak.outline.expect
@@ -60,11 +60,11 @@ extension E on core::int {
 }
 static field core::int new;
 static field self::C c;
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic
   ;
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/new_as_selector.dart.weak.transformed.expect b/pkg/front_end/testcases/general/new_as_selector.dart.weak.transformed.expect
index 8e7949253b7..a675ca4c868 100644
--- a/pkg/front_end/testcases/general/new_as_selector.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/new_as_selector.dart.weak.transformed.expect
@@ -363,10 +363,10 @@ extension E on core::int {
 }
 static field core::int new = 87;
 static field self::C c = new self::C::•();
-external static method E|get#new(lowered core::int #this) → core::int;
-external static method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
-static method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
-static method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
+external static extension-member method E|get#new(lowered core::int #this) → core::int;
+external static extension-member method E|set#new(lowered core::int #this, core::int #externalFieldValue) → void;
+static extension-member method E|call<T extends core::Object? = dynamic>(lowered final core::int #this) → dynamic {}
+static extension-member method E|get#call(lowered final core::int #this) → <T extends core::Object? = dynamic>() → dynamic
   return <T extends core::Object? = dynamic>() → dynamic => self::E|call<T%>(#this);
 static method method(dynamic d) → dynamic
   return d{dynamic}.new;
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.expect
index ab9ec97b672..0112b2d54b8 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.expect
@@ -237,17 +237,17 @@ static method _method(test::Class c) → void {
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -263,17 +263,17 @@ static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -289,17 +289,17 @@ static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.transformed.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.transformed.expect
index ab9ec97b672..0112b2d54b8 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.strong.transformed.expect
@@ -237,17 +237,17 @@ static method _method(test::Class c) → void {
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -263,17 +263,17 @@ static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -289,17 +289,17 @@ static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.expect
index ab9ec97b672..0112b2d54b8 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.expect
@@ -237,17 +237,17 @@ static method _method(test::Class c) → void {
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -263,17 +263,17 @@ static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -289,17 +289,17 @@ static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.modular.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.modular.expect
index ab9ec97b672..0112b2d54b8 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.modular.expect
@@ -237,17 +237,17 @@ static method _method(test::Class c) → void {
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -263,17 +263,17 @@ static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -289,17 +289,17 @@ static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.outline.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.outline.expect
index 918b83bdadb..563f88ef766 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.outline.expect
@@ -82,57 +82,57 @@ extension /* unnamed */ _extension#5 on test::Class {
 }
 static method _method(test::Class c) → void
   ;
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void
   ;
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void
   ;
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void
   ;
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void
   ;
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 
diff --git a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.transformed.expect b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.transformed.expect
index ab9ec97b672..0112b2d54b8 100644
--- a/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/patch_extension_scope/main.dart.weak.transformed.expect
@@ -237,17 +237,17 @@ static method _method(test::Class c) → void {
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final test::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final test::Class #this) → () → void
   return () → void => test::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -263,17 +263,17 @@ static method /* from org-dartlang-testcase:///patch_lib1.dart */ _method1(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final test::Class #this) → () → void
   return () → void => test::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test::Class c) → void {
   test::Extension|namedExtensionMethod(c);
@@ -289,17 +289,17 @@ static method /* from org-dartlang-testcase:///patch_lib2.dart */ _method2(test:
   test::_extension#3|unnamedInjectedExtensionMethod2(c);
   test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
-static method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///patch_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final test::Class #this) → () → void
   return () → void => test::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/private_members.dart.strong.expect b/pkg/front_end/testcases/general/private_members.dart.strong.expect
index b205b11d5fa..88810ebcef5 100644
--- a/pkg/front_end/testcases/general/private_members.dart.strong.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.strong.expect
@@ -50,12 +50,12 @@ static method main() → dynamic {
   self::_Extension|_privateField = self::_Extension|_privateField;
   self::_Extension|_privateFinalField;
 }
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   return 42;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
 
 constants  {
   #C1 = constructor-tearoff self::_Class::_privateRedirectingFactory
diff --git a/pkg/front_end/testcases/general/private_members.dart.strong.transformed.expect b/pkg/front_end/testcases/general/private_members.dart.strong.transformed.expect
index b205b11d5fa..88810ebcef5 100644
--- a/pkg/front_end/testcases/general/private_members.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.strong.transformed.expect
@@ -50,12 +50,12 @@ static method main() → dynamic {
   self::_Extension|_privateField = self::_Extension|_privateField;
   self::_Extension|_privateFinalField;
 }
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   return 42;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
 
 constants  {
   #C1 = constructor-tearoff self::_Class::_privateRedirectingFactory
diff --git a/pkg/front_end/testcases/general/private_members.dart.weak.expect b/pkg/front_end/testcases/general/private_members.dart.weak.expect
index b205b11d5fa..88810ebcef5 100644
--- a/pkg/front_end/testcases/general/private_members.dart.weak.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.weak.expect
@@ -50,12 +50,12 @@ static method main() → dynamic {
   self::_Extension|_privateField = self::_Extension|_privateField;
   self::_Extension|_privateFinalField;
 }
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   return 42;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
 
 constants  {
   #C1 = constructor-tearoff self::_Class::_privateRedirectingFactory
diff --git a/pkg/front_end/testcases/general/private_members.dart.weak.modular.expect b/pkg/front_end/testcases/general/private_members.dart.weak.modular.expect
index b205b11d5fa..88810ebcef5 100644
--- a/pkg/front_end/testcases/general/private_members.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.weak.modular.expect
@@ -50,12 +50,12 @@ static method main() → dynamic {
   self::_Extension|_privateField = self::_Extension|_privateField;
   self::_Extension|_privateFinalField;
 }
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   return 42;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
 
 constants  {
   #C1 = constructor-tearoff self::_Class::_privateRedirectingFactory
diff --git a/pkg/front_end/testcases/general/private_members.dart.weak.outline.expect b/pkg/front_end/testcases/general/private_members.dart.weak.outline.expect
index 0a36beb9012..db316e8a1c8 100644
--- a/pkg/front_end/testcases/general/private_members.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.weak.outline.expect
@@ -38,13 +38,13 @@ static method test(self::_AbstractClass c) → dynamic
   ;
 static method main() → dynamic
   ;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void
   ;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   ;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void
   ;
 
 
diff --git a/pkg/front_end/testcases/general/private_members.dart.weak.transformed.expect b/pkg/front_end/testcases/general/private_members.dart.weak.transformed.expect
index b205b11d5fa..88810ebcef5 100644
--- a/pkg/front_end/testcases/general/private_members.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/private_members.dart.weak.transformed.expect
@@ -50,12 +50,12 @@ static method main() → dynamic {
   self::_Extension|_privateField = self::_Extension|_privateField;
   self::_Extension|_privateFinalField;
 }
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateMethod(lowered final core::int #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateMethod(lowered final core::int #this) → () → void
   return () → void => self::_Extension|_privateMethod(#this);
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|get#_privateGetter(lowered final core::int #this) → core::int
   return 42;
-static method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
+static extension-member method /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|set#_privateSetter(lowered final core::int #this, core::int value) → void {}
 
 constants  {
   #C1 = constructor-tearoff self::_Class::_privateRedirectingFactory
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.expect
index 669204ef0e5..32dca941ffa 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.expect
@@ -197,10 +197,10 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.transformed.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.transformed.expect
index 669204ef0e5..32dca941ffa 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.strong.transformed.expect
@@ -197,10 +197,10 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.expect
index 38c5cec3d3c..72c27c8c999 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.expect
@@ -190,10 +190,10 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.modular.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.modular.expect
index 38c5cec3d3c..72c27c8c999 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.modular.expect
@@ -190,10 +190,10 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.outline.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.outline.expect
index 0775bcd55e3..48138a2743b 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.outline.expect
@@ -74,13 +74,13 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   ;
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void
   ;
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   ;
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.transformed.expect b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.transformed.expect
index 38c5cec3d3c..72c27c8c999 100644
--- a/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/pure_index_expressions.dart.weak.transformed.expect
@@ -190,10 +190,10 @@ extension Extension2 on self::Class2* {
   operator [] = self::Extension2|[];
   operator []= = self::Extension2|[]=;
 }
-static method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
+static extension-member method Extension|[](lowered final core::int* #this, self::Class* cls) → self::Class*
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
-static method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
+static extension-member method Extension|[]=(lowered final core::int* #this, self::Class* cls, self::Class* value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2* #this, self::Class2* cls) → self::Class2*
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2* #this, self::Class2* cls, self::Class2* value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.expect
index b97446d261f..b15b0563eb0 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.expect
@@ -80,18 +80,18 @@ static method method2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
 @#C1
-static method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
   @#C1 dynamic l1;
   @#C1
   function l2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → Null {}
 }
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2 = #C3]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @#C1
-static method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2 = #C3}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.transformed.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.transformed.expect
index b97446d261f..b15b0563eb0 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.strong.transformed.expect
@@ -80,18 +80,18 @@ static method method2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
 @#C1
-static method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
   @#C1 dynamic l1;
   @#C1
   function l2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → Null {}
 }
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2 = #C3]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @#C1
-static method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2 = #C3}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.expect
index b97446d261f..b15b0563eb0 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.expect
@@ -80,18 +80,18 @@ static method method2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
 @#C1
-static method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
   @#C1 dynamic l1;
   @#C1
   function l2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → Null {}
 }
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2 = #C3]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @#C1
-static method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2 = #C3}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.modular.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.modular.expect
index b97446d261f..b15b0563eb0 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.modular.expect
@@ -80,18 +80,18 @@ static method method2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
 @#C1
-static method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
   @#C1 dynamic l1;
   @#C1
   function l2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → Null {}
 }
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2 = #C3]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @#C1
-static method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2 = #C3}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.outline.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.outline.expect
index 9bb0143d72e..b22c12bfce5 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.outline.expect
@@ -56,14 +56,14 @@ static method method1<@self::Const::internal() T extends core::Object? = dynamic
 static method method2<@self::Const::internal() T extends core::Object? = dynamic>(dynamic o1, {dynamic o2}) → dynamic
   ;
 @self::Const::internal()
-static method Extension|method1<#T extends core::Object? = dynamic, @self::Const::internal() T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, dynamic o1, [dynamic o2]) → dynamic
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @self::Const::internal() T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, dynamic o1, [dynamic o2]) → dynamic
   ;
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @self::Const::internal()
-static method Extension|method2<#T extends core::Object? = dynamic, @self::Const::internal() T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, dynamic o1, {dynamic o2}) → dynamic
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @self::Const::internal() T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, dynamic o1, {dynamic o2}) → dynamic
   ;
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.transformed.expect b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.transformed.expect
index b97446d261f..b15b0563eb0 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_invocation_metadata.dart.weak.transformed.expect
@@ -80,18 +80,18 @@ static method method2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
 @#C1
-static method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
+static extension-member method Extension|method1<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method1::#T%> #this, @#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → dynamic {
   @#C1 dynamic l1;
   @#C1
   function l2<@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, [@#C1 dynamic o2 = #C3]) → Null {}
 }
-static method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
+static extension-member method Extension|get#method1<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method1::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, [dynamic]) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, [dynamic o2 = #C3]) → dynamic => self::Extension|method1<self::Extension|get#method1::#T%, T%>(#this, o1, o2);
 @#C1
-static method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
+static extension-member method Extension|method2<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|method2::#T%> #this, @#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → dynamic {
   <@#C1 T extends core::Object? = dynamic>(@#C1 dynamic o1, {@#C1 dynamic o2 = #C3}) → Null {};
 }
-static method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
+static extension-member method Extension|get#method2<#T extends core::Object? = dynamic>(lowered final self::Class<self::Extension|get#method2::#T%> #this) → <T extends core::Object? = dynamic>(dynamic, {o2: dynamic}) → dynamic
   return <T extends core::Object? = dynamic>(dynamic o1, {dynamic o2 = #C3}) → dynamic => self::Extension|method2<self::Extension|get#method2::#T%, T%>(#this, o1, o2: o2);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.strong.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.strong.expect
index b4ef3833c86..82d914cb971 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.strong.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.strong.expect
@@ -42,8 +42,8 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
   throw "";
 }
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.strong.transformed.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.strong.transformed.expect
index 9a441ba462a..9c0f8d9cced 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.strong.transformed.expect
@@ -44,8 +44,8 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
   throw "";
 }
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.expect
index b4ef3833c86..82d914cb971 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.expect
@@ -42,8 +42,8 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
   throw "";
 }
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.modular.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.modular.expect
index b4ef3833c86..82d914cb971 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.modular.expect
@@ -42,8 +42,8 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
   throw "";
 }
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.outline.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.outline.expect
index b5906ef18eb..5600712efd2 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.outline.expect
@@ -36,7 +36,7 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%>
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%>
   ;
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.transformed.expect b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.transformed.expect
index 9a441ba462a..9c0f8d9cced 100644
--- a/pkg/front_end/testcases/general/top_level_promotion.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/top_level_promotion.dart.weak.transformed.expect
@@ -44,8 +44,8 @@ extension Extension1<V extends core::Object? = dynamic> on self::Class2<V%> {
   method method1 = self::Extension1|method1;
   tearoff method1 = self::Extension1|get#method1;
 }
-static method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
+static extension-member method Extension1|method1<V extends core::Object? = dynamic, M extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|method1::V%> #this, (self::Extension1|method1::V%) → self::Class2<self::Extension1|method1::M%>? f) → self::Class3<self::Extension1|method1::M%, self::Extension1|method1::V%> {
   throw "";
 }
-static method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
+static extension-member method Extension1|get#method1<V extends core::Object? = dynamic>(lowered final self::Class2<self::Extension1|get#method1::V%> #this) → <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>?) → self::Class3<M%, self::Extension1|get#method1::V%>
   return <M extends core::Object? = dynamic>((self::Extension1|get#method1::V%) → self::Class2<M%>? f) → self::Class3<M%, self::Extension1|get#method1::V%> => self::Extension1|method1<self::Extension1|get#method1::V%, M%>(#this, f);
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect
index e15e9913afa..f4d1d74bf9c 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.expect
@@ -151,15 +151,15 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type {
+static extension-member method Foo|foo1() → invalid-type {
   throw "";
 }
-static method Foo|foo1Prime() → core::List<invalid-type> {
+static extension-member method Foo|foo1Prime() → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo2(invalid-type x) → void {}
-static method Foo|foo2Prime(core::List<invalid-type> x) → void {}
-static method Foo|foo3() → void {
+static extension-member method Foo|foo2(invalid-type x) → void {}
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void {}
+static extension-member method Foo|foo3() → void {
   invalid-type foo4;
   core::List<invalid-type> foo4Prime;
   function foo5(invalid-type y) → void
@@ -173,19 +173,19 @@ static method Foo|foo3() → void {
   (invalid-type) → void foo7 = (invalid-type y) → void => y;
   (core::List<invalid-type>) → void foo7Prime = (core::List<invalid-type> y) → void => y;
 }
-static method Foo|foo8() → () → invalid-type {
+static extension-member method Foo|foo8() → () → invalid-type {
   throw "";
 }
-static method Foo|foo8Prime() → () → core::List<invalid-type> {
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo9() → (invalid-type) → void {}
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
-static method Foo|foo10(() → invalid-type Function) → void {}
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
-static method Foo|foo11((dynamic) → void Function) → void {}
-static method Foo|foo12((invalid-type) → void b) → void {}
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
-static method Foo|foo13((invalid-type) → void Function) → void {}
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
+static extension-member method Foo|foo9() → (invalid-type) → void {}
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
+static extension-member method Foo|foo10(() → invalid-type Function) → void {}
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
+static extension-member method Foo|foo11((dynamic) → void Function) → void {}
+static extension-member method Foo|foo12((invalid-type) → void b) → void {}
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
+static extension-member method Foo|foo13((invalid-type) → void Function) → void {}
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect
index e15e9913afa..f4d1d74bf9c 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.strong.transformed.expect
@@ -151,15 +151,15 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type {
+static extension-member method Foo|foo1() → invalid-type {
   throw "";
 }
-static method Foo|foo1Prime() → core::List<invalid-type> {
+static extension-member method Foo|foo1Prime() → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo2(invalid-type x) → void {}
-static method Foo|foo2Prime(core::List<invalid-type> x) → void {}
-static method Foo|foo3() → void {
+static extension-member method Foo|foo2(invalid-type x) → void {}
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void {}
+static extension-member method Foo|foo3() → void {
   invalid-type foo4;
   core::List<invalid-type> foo4Prime;
   function foo5(invalid-type y) → void
@@ -173,19 +173,19 @@ static method Foo|foo3() → void {
   (invalid-type) → void foo7 = (invalid-type y) → void => y;
   (core::List<invalid-type>) → void foo7Prime = (core::List<invalid-type> y) → void => y;
 }
-static method Foo|foo8() → () → invalid-type {
+static extension-member method Foo|foo8() → () → invalid-type {
   throw "";
 }
-static method Foo|foo8Prime() → () → core::List<invalid-type> {
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo9() → (invalid-type) → void {}
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
-static method Foo|foo10(() → invalid-type Function) → void {}
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
-static method Foo|foo11((dynamic) → void Function) → void {}
-static method Foo|foo12((invalid-type) → void b) → void {}
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
-static method Foo|foo13((invalid-type) → void Function) → void {}
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
+static extension-member method Foo|foo9() → (invalid-type) → void {}
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
+static extension-member method Foo|foo10(() → invalid-type Function) → void {}
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
+static extension-member method Foo|foo11((dynamic) → void Function) → void {}
+static extension-member method Foo|foo12((invalid-type) → void b) → void {}
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
+static extension-member method Foo|foo13((invalid-type) → void Function) → void {}
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.expect
index e15e9913afa..f4d1d74bf9c 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.expect
@@ -151,15 +151,15 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type {
+static extension-member method Foo|foo1() → invalid-type {
   throw "";
 }
-static method Foo|foo1Prime() → core::List<invalid-type> {
+static extension-member method Foo|foo1Prime() → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo2(invalid-type x) → void {}
-static method Foo|foo2Prime(core::List<invalid-type> x) → void {}
-static method Foo|foo3() → void {
+static extension-member method Foo|foo2(invalid-type x) → void {}
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void {}
+static extension-member method Foo|foo3() → void {
   invalid-type foo4;
   core::List<invalid-type> foo4Prime;
   function foo5(invalid-type y) → void
@@ -173,19 +173,19 @@ static method Foo|foo3() → void {
   (invalid-type) → void foo7 = (invalid-type y) → void => y;
   (core::List<invalid-type>) → void foo7Prime = (core::List<invalid-type> y) → void => y;
 }
-static method Foo|foo8() → () → invalid-type {
+static extension-member method Foo|foo8() → () → invalid-type {
   throw "";
 }
-static method Foo|foo8Prime() → () → core::List<invalid-type> {
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo9() → (invalid-type) → void {}
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
-static method Foo|foo10(() → invalid-type Function) → void {}
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
-static method Foo|foo11((dynamic) → void Function) → void {}
-static method Foo|foo12((invalid-type) → void b) → void {}
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
-static method Foo|foo13((invalid-type) → void Function) → void {}
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
+static extension-member method Foo|foo9() → (invalid-type) → void {}
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
+static extension-member method Foo|foo10(() → invalid-type Function) → void {}
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
+static extension-member method Foo|foo11((dynamic) → void Function) → void {}
+static extension-member method Foo|foo12((invalid-type) → void b) → void {}
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
+static extension-member method Foo|foo13((invalid-type) → void Function) → void {}
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.modular.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.modular.expect
index e15e9913afa..f4d1d74bf9c 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.modular.expect
@@ -151,15 +151,15 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type {
+static extension-member method Foo|foo1() → invalid-type {
   throw "";
 }
-static method Foo|foo1Prime() → core::List<invalid-type> {
+static extension-member method Foo|foo1Prime() → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo2(invalid-type x) → void {}
-static method Foo|foo2Prime(core::List<invalid-type> x) → void {}
-static method Foo|foo3() → void {
+static extension-member method Foo|foo2(invalid-type x) → void {}
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void {}
+static extension-member method Foo|foo3() → void {
   invalid-type foo4;
   core::List<invalid-type> foo4Prime;
   function foo5(invalid-type y) → void
@@ -173,19 +173,19 @@ static method Foo|foo3() → void {
   (invalid-type) → void foo7 = (invalid-type y) → void => y;
   (core::List<invalid-type>) → void foo7Prime = (core::List<invalid-type> y) → void => y;
 }
-static method Foo|foo8() → () → invalid-type {
+static extension-member method Foo|foo8() → () → invalid-type {
   throw "";
 }
-static method Foo|foo8Prime() → () → core::List<invalid-type> {
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo9() → (invalid-type) → void {}
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
-static method Foo|foo10(() → invalid-type Function) → void {}
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
-static method Foo|foo11((dynamic) → void Function) → void {}
-static method Foo|foo12((invalid-type) → void b) → void {}
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
-static method Foo|foo13((invalid-type) → void Function) → void {}
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
+static extension-member method Foo|foo9() → (invalid-type) → void {}
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
+static extension-member method Foo|foo10(() → invalid-type Function) → void {}
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
+static extension-member method Foo|foo11((dynamic) → void Function) → void {}
+static extension-member method Foo|foo12((invalid-type) → void b) → void {}
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
+static extension-member method Foo|foo13((invalid-type) → void Function) → void {}
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.outline.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.outline.expect
index a67088bc711..0515a074700 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.outline.expect
@@ -111,37 +111,37 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type
+static extension-member method Foo|foo1() → invalid-type
   ;
-static method Foo|foo1Prime() → core::List<invalid-type>
+static extension-member method Foo|foo1Prime() → core::List<invalid-type>
   ;
-static method Foo|foo2(invalid-type x) → void
+static extension-member method Foo|foo2(invalid-type x) → void
   ;
-static method Foo|foo2Prime(core::List<invalid-type> x) → void
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void
   ;
-static method Foo|foo3() → void
+static extension-member method Foo|foo3() → void
   ;
-static method Foo|foo8() → () → invalid-type
+static extension-member method Foo|foo8() → () → invalid-type
   ;
-static method Foo|foo8Prime() → () → core::List<invalid-type>
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type>
   ;
-static method Foo|foo9() → (invalid-type) → void
+static extension-member method Foo|foo9() → (invalid-type) → void
   ;
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void
   ;
-static method Foo|foo10(() → invalid-type Function) → void
+static extension-member method Foo|foo10(() → invalid-type Function) → void
   ;
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void
   ;
-static method Foo|foo11((dynamic) → void Function) → void
+static extension-member method Foo|foo11((dynamic) → void Function) → void
   ;
-static method Foo|foo12((invalid-type) → void b) → void
+static extension-member method Foo|foo12((invalid-type) → void b) → void
   ;
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void
   ;
-static method Foo|foo13((invalid-type) → void Function) → void
+static extension-member method Foo|foo13((invalid-type) → void Function) → void
   ;
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.transformed.expect
index e15e9913afa..f4d1d74bf9c 100644
--- a/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/type_parameter_usage_in_static_method_in_extension.dart.weak.transformed.expect
@@ -151,15 +151,15 @@ late static field invalid-type Foo|foo14;
 late static field core::List<invalid-type> Foo|foo14Prime;
 late static field (invalid-type) → invalid-type Foo|foo15;
 late static field (core::List<invalid-type>) → core::List<invalid-type> Foo|foo15Prime;
-static method Foo|foo1() → invalid-type {
+static extension-member method Foo|foo1() → invalid-type {
   throw "";
 }
-static method Foo|foo1Prime() → core::List<invalid-type> {
+static extension-member method Foo|foo1Prime() → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo2(invalid-type x) → void {}
-static method Foo|foo2Prime(core::List<invalid-type> x) → void {}
-static method Foo|foo3() → void {
+static extension-member method Foo|foo2(invalid-type x) → void {}
+static extension-member method Foo|foo2Prime(core::List<invalid-type> x) → void {}
+static extension-member method Foo|foo3() → void {
   invalid-type foo4;
   core::List<invalid-type> foo4Prime;
   function foo5(invalid-type y) → void
@@ -173,19 +173,19 @@ static method Foo|foo3() → void {
   (invalid-type) → void foo7 = (invalid-type y) → void => y;
   (core::List<invalid-type>) → void foo7Prime = (core::List<invalid-type> y) → void => y;
 }
-static method Foo|foo8() → () → invalid-type {
+static extension-member method Foo|foo8() → () → invalid-type {
   throw "";
 }
-static method Foo|foo8Prime() → () → core::List<invalid-type> {
+static extension-member method Foo|foo8Prime() → () → core::List<invalid-type> {
   throw "";
 }
-static method Foo|foo9() → (invalid-type) → void {}
-static method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
-static method Foo|foo10(() → invalid-type Function) → void {}
-static method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
-static method Foo|foo11((dynamic) → void Function) → void {}
-static method Foo|foo12((invalid-type) → void b) → void {}
-static method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
-static method Foo|foo13((invalid-type) → void Function) → void {}
-static method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
+static extension-member method Foo|foo9() → (invalid-type) → void {}
+static extension-member method Foo|foo9Prime() → (core::List<invalid-type>) → void {}
+static extension-member method Foo|foo10(() → invalid-type Function) → void {}
+static extension-member method Foo|foo10Prime(() → core::List<invalid-type> Function) → void {}
+static extension-member method Foo|foo11((dynamic) → void Function) → void {}
+static extension-member method Foo|foo12((invalid-type) → void b) → void {}
+static extension-member method Foo|foo12Prime((core::List<invalid-type>) → void b) → void {}
+static extension-member method Foo|foo13((invalid-type) → void Function) → void {}
+static extension-member method Foo|foo13Prime((core::List<invalid-type>) → void Function) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.expect
index 9fbfb197a57..4ff0977cd68 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.expect
@@ -21,8 +21,8 @@ extension Extension<@#C1 T extends core::Object? = dynamic> on T% {
   tearoff method = self::Extension|get#method;
 }
 static method method<@#C1 T extends core::Object? = dynamic>() → void {}
-static method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.transformed.expect
index 9fbfb197a57..4ff0977cd68 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.strong.transformed.expect
@@ -21,8 +21,8 @@ extension Extension<@#C1 T extends core::Object? = dynamic> on T% {
   tearoff method = self::Extension|get#method;
 }
 static method method<@#C1 T extends core::Object? = dynamic>() → void {}
-static method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.expect
index 9fbfb197a57..4ff0977cd68 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.expect
@@ -21,8 +21,8 @@ extension Extension<@#C1 T extends core::Object? = dynamic> on T% {
   tearoff method = self::Extension|get#method;
 }
 static method method<@#C1 T extends core::Object? = dynamic>() → void {}
-static method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.modular.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.modular.expect
index 9fbfb197a57..4ff0977cd68 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.modular.expect
@@ -21,8 +21,8 @@ extension Extension<@#C1 T extends core::Object? = dynamic> on T% {
   tearoff method = self::Extension|get#method;
 }
 static method method<@#C1 T extends core::Object? = dynamic>() → void {}
-static method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.outline.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.outline.expect
index b193453b66d..8bc67b5fe13 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.outline.expect
@@ -20,9 +20,9 @@ extension Extension<@self::A::•() T extends core::Object? = dynamic> on T% {
 }
 static method method<@self::A::•() T extends core::Object? = dynamic>() → void
   ;
-static method Extension|method<#T extends core::Object? = dynamic, @self::A::•() T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @self::A::•() T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void
   ;
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.transformed.expect
index 9fbfb197a57..4ff0977cd68 100644
--- a/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/type_variable_annotations.dart.weak.transformed.expect
@@ -21,8 +21,8 @@ extension Extension<@#C1 T extends core::Object? = dynamic> on T% {
   tearoff method = self::Extension|get#method;
 }
 static method method<@#C1 T extends core::Object? = dynamic>() → void {}
-static method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
-static method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
+static extension-member method Extension|method<#T extends core::Object? = dynamic, @#C1 T extends core::Object? = dynamic>(lowered final self::Extension|method::#T% #this) → void {}
+static extension-member method Extension|get#method<#T extends core::Object? = dynamic>(lowered final self::Extension|get#method::#T% #this) → <T extends core::Object? = dynamic>() → void
   return <T extends core::Object? = dynamic>() → void => self::Extension|method<self::Extension|get#method::#T%, T%>(#this);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.expect
index 612f7488fd8..a87d42d5aa2 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.expect
@@ -588,7 +588,7 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
   invalid-type local;
   #C4;
   function fun<U extends invalid-type>() → void {}
@@ -596,11 +596,11 @@ static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) 
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
   self::Extension|instanceMethod::T%;
   return t;
 }
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic {}
 static method _#B#new#tearOff<T extends core::num>() → self::Class<self::_#B#new#tearOff::T>
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.transformed.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.transformed.expect
index fe78fde00c2..503c1782a09 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.strong.transformed.expect
@@ -588,7 +588,7 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
   invalid-type local;
   #C4;
   function fun<U extends invalid-type>() → void {}
@@ -596,11 +596,11 @@ static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) 
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
   self::Extension|instanceMethod::T%;
   return t;
 }
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic {}
 static method _#B#new#tearOff<T extends core::num>() → self::Class<self::_#B#new#tearOff::T>
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.expect
index 3f282e2bc4e..40e5c8cee38 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.expect
@@ -588,7 +588,7 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
   invalid-type local;
   #C4;
   function fun<U extends invalid-type>() → void {}
@@ -596,11 +596,11 @@ static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) 
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
   self::Extension|instanceMethod::T%;
   return t;
 }
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic {}
 static method _#B#new#tearOff<T extends core::num>() → self::Class<self::_#B#new#tearOff::T>
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.modular.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.modular.expect
index 3f282e2bc4e..40e5c8cee38 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.modular.expect
@@ -588,7 +588,7 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
   invalid-type local;
   #C4;
   function fun<U extends invalid-type>() → void {}
@@ -596,11 +596,11 @@ static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) 
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
   self::Extension|instanceMethod::T%;
   return t;
 }
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic {}
 static method _#B#new#tearOff<T extends core::num>() → self::Class<self::_#B#new#tearOff::T>
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.outline.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.outline.expect
index 1e15d96afa6..c71ffb396f3 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.outline.expect
@@ -360,14 +360,14 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type
   ;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T%
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T%
   ;
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.transformed.expect b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.transformed.expect
index 5c7afde60f9..673e4230194 100644
--- a/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/type_variable_in_static_context.dart.weak.transformed.expect
@@ -588,7 +588,7 @@ static field invalid-type Extension|field1;
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:115:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
+static extension-member method Extension|staticMethod<S extends invalid-type>(invalid-type arg) → invalid-type {
   invalid-type local;
   #C4;
   function fun<U extends invalid-type>() → void {}
@@ -596,11 +596,11 @@ static method Extension|staticMethod<S extends invalid-type>(invalid-type arg) 
 @invalid-expression "pkg/front_end/testcases/general/type_variable_in_static_context.dart:122:4: Error: Couldn't find constructor 'T'.
   @T()
    ^"
-static method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
+static extension-member method Extension|instanceMethod<T extends core::Object? = dynamic, S extends self::Extension|instanceMethod::T% = dynamic>(lowered final self::Extension|instanceMethod::T% #this, self::Extension|instanceMethod::T% t) → self::Extension|instanceMethod::T% {
   self::Extension|instanceMethod::T%;
   return t;
 }
-static method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
+static extension-member method Extension|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::Extension|get#instanceMethod::T% #this) → <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T%) → self::Extension|get#instanceMethod::T%
   return <S extends self::Extension|get#instanceMethod::T% = dynamic>(self::Extension|get#instanceMethod::T% t) → self::Extension|get#instanceMethod::T% => self::Extension|instanceMethod<self::Extension|get#instanceMethod::T%, S%>(#this, t);
 static method main() → dynamic {}
 static method _#B#new#tearOff<T extends core::num>() → self::Class<self::_#B#new#tearOff::T>
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.expect
index dc0be3c9ad4..0176282c6a6 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.expect
@@ -107,14 +107,14 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   return null;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.transformed.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.transformed.expect
index dc0be3c9ad4..0176282c6a6 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.strong.transformed.expect
@@ -107,14 +107,14 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   return null;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.expect
index 612fe6279fa..98d609dbd53 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.expect
@@ -103,14 +103,14 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   return null;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.modular.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.modular.expect
index 612fe6279fa..98d609dbd53 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.modular.expect
@@ -103,14 +103,14 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   return null;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.outline.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.outline.expect
index 5e98f62388f..6fb32b92c91 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.outline.expect
@@ -101,17 +101,17 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   ;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void
   ;
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void
   ;
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.transformed.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.transformed.expect
index 612fe6279fa..98d609dbd53 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline.dart.weak.transformed.expect
@@ -103,14 +103,14 @@ extension E<X extends self::A<core::num*>*> on self::A<core::int*>* {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num*>* E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
+static extension-member method E|fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → self::A<core::num*>*
   return null;
-static method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
+static extension-member method E|get#fooOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → () →* self::A<core::num*>*
   return () → self::A<core::num*>* => self::E|fooOfE<self::E|get#fooOfE::X*>(#this);
-static method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
-static method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
+static extension-member method E|barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this, self::A<core::num*>* a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → (self::A<core::num*>*) →* void
   return (self::A<core::num*>* a) → void => self::E|barOfE<self::E|get#barOfE::X*>(#this, a);
-static method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
+static extension-member method E|bazOfE<X extends self::A<core::num*>*, Y extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num*>*>(lowered final self::A<core::int*>* #this) → <Y extends self::A<core::num*>*>() →* void
   return <Y extends self::A<core::num*>*>() → void => self::E|bazOfE<self::E|get#bazOfE::X*, Y*>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.expect
index 9bd06ab747e..060554dbe35 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.expect
@@ -83,14 +83,14 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   return null;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.transformed.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.transformed.expect
index 9bd06ab747e..060554dbe35 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.strong.transformed.expect
@@ -83,14 +83,14 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   return null;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.expect
index 9bd06ab747e..060554dbe35 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.expect
@@ -83,14 +83,14 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   return null;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.modular.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.modular.expect
index 9bd06ab747e..060554dbe35 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.modular.expect
@@ -83,14 +83,14 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   return null;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.outline.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.outline.expect
index 2f7894c565d..1bf9afefe38 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.outline.expect
@@ -81,17 +81,17 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   ;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void
   ;
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void
   ;
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.transformed.expect b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.transformed.expect
index 9bd06ab747e..060554dbe35 100644
--- a/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/well_boundness_checks_in_outline2.dart.weak.transformed.expect
@@ -83,14 +83,14 @@ extension E<X extends self::A<core::num>> on self::A<core::int> {
   tearoff bazOfE = self::E|get#bazOfE;
 }
 static field self::A<core::num>? E|fieldOfE;
-static method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
+static extension-member method E|fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → self::A<core::num>?
   return null;
-static method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
+static extension-member method E|get#fooOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → () → self::A<core::num>?
   return () → self::A<core::num>? => self::E|fooOfE<self::E|get#fooOfE::X>(#this);
-static method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
-static method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
+static extension-member method E|barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this, self::A<core::num> a) → void {}
+static extension-member method E|get#barOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → (self::A<core::num>) → void
   return (self::A<core::num> a) → void => self::E|barOfE<self::E|get#barOfE::X>(#this, a);
-static method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
-static method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
+static extension-member method E|bazOfE<X extends self::A<core::num>, Y extends self::A<core::num>>(lowered final self::A<core::int> #this) → void {}
+static extension-member method E|get#bazOfE<X extends self::A<core::num>>(lowered final self::A<core::int> #this) → <Y extends self::A<core::num>>() → void
   return <Y extends self::A<core::num>>() → void => self::E|bazOfE<self::E|get#bazOfE::X, Y>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.expect b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.expect
index 2d7ed13e938..11ea33f3ca3 100644
--- a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.expect
+++ b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.expect
@@ -24,7 +24,7 @@ extension Extension on core::String {
   method foo = ext::Extension|foo;
   tearoff foo = ext::Extension|get#foo;
 }
-static method Extension|foo(lowered final core::String #this) → dynamic
+static extension-member method Extension|foo(lowered final core::String #this) → dynamic
   return 42;
-static method Extension|get#foo(lowered final core::String #this) → () → dynamic
+static extension-member method Extension|get#foo(lowered final core::String #this) → () → dynamic
   return () → dynamic => ext::Extension|foo(#this);
diff --git a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.transformed.expect b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.transformed.expect
index 2d7ed13e938..11ea33f3ca3 100644
--- a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.strong.transformed.expect
@@ -24,7 +24,7 @@ extension Extension on core::String {
   method foo = ext::Extension|foo;
   tearoff foo = ext::Extension|get#foo;
 }
-static method Extension|foo(lowered final core::String #this) → dynamic
+static extension-member method Extension|foo(lowered final core::String #this) → dynamic
   return 42;
-static method Extension|get#foo(lowered final core::String #this) → () → dynamic
+static extension-member method Extension|get#foo(lowered final core::String #this) → () → dynamic
   return () → dynamic => ext::Extension|foo(#this);
diff --git a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.expect b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.expect
index 2d7ed13e938..11ea33f3ca3 100644
--- a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.expect
+++ b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.expect
@@ -24,7 +24,7 @@ extension Extension on core::String {
   method foo = ext::Extension|foo;
   tearoff foo = ext::Extension|get#foo;
 }
-static method Extension|foo(lowered final core::String #this) → dynamic
+static extension-member method Extension|foo(lowered final core::String #this) → dynamic
   return 42;
-static method Extension|get#foo(lowered final core::String #this) → () → dynamic
+static extension-member method Extension|get#foo(lowered final core::String #this) → () → dynamic
   return () → dynamic => ext::Extension|foo(#this);
diff --git a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.outline.expect b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.outline.expect
index 5e25cef7c9b..806bb1111c6 100644
--- a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.outline.expect
@@ -22,7 +22,7 @@ extension Extension on core::String {
   method foo = ext::Extension|foo;
   tearoff foo = ext::Extension|get#foo;
 }
-static method Extension|foo(lowered final core::String #this) → dynamic
+static extension-member method Extension|foo(lowered final core::String #this) → dynamic
   ;
-static method Extension|get#foo(lowered final core::String #this) → () → dynamic
+static extension-member method Extension|get#foo(lowered final core::String #this) → () → dynamic
   return () → dynamic => ext::Extension|foo(#this);
diff --git a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.transformed.expect b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.transformed.expect
index 2d7ed13e938..11ea33f3ca3 100644
--- a/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/with_dependencies/extension_from_dill/extension_from_dill.dart.weak.transformed.expect
@@ -24,7 +24,7 @@ extension Extension on core::String {
   method foo = ext::Extension|foo;
   tearoff foo = ext::Extension|get#foo;
 }
-static method Extension|foo(lowered final core::String #this) → dynamic
+static extension-member method Extension|foo(lowered final core::String #this) → dynamic
   return 42;
-static method Extension|get#foo(lowered final core::String #this) → () → dynamic
+static extension-member method Extension|get#foo(lowered final core::String #this) → () → dynamic
   return () → dynamic => ext::Extension|foo(#this);
diff --git a/pkg/front_end/testcases/incremental/extension_expression_compilation_usage.yaml.world.1.expect b/pkg/front_end/testcases/incremental/extension_expression_compilation_usage.yaml.world.1.expect
index 02d4ea6e076..ff3c2565919 100644
--- a/pkg/front_end/testcases/incremental/extension_expression_compilation_usage.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/extension_expression_compilation_usage.yaml.world.1.expect
@@ -5,9 +5,9 @@ library from "org-dartlang-test:///main.dart" as main {
     method parseInt = main::NumberParsing|parseInt;
     tearoff parseInt = main::NumberParsing|get#parseInt;
   }
-  static method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
+  static extension-member method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
     return dart.core::int::parse(#this);
   }
-  static method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
+  static extension-member method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
     return () → dart.core::int => main::NumberParsing|parseInt(#this);
 }
diff --git a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.1.expect b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.1.expect
index 9dde03dcfcf..e7ff789c603 100644
--- a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.1.expect
@@ -4,7 +4,7 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
   extension OnObject on dart.core::Object {
     get onObject = lib1::OnObject|get#onObject;
   }
-  static method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
+  static extension-member method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
     return "object #1";
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -12,7 +12,7 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
   extension AlsoOnObject on dart.core::Object {
     get onObject = lib2::AlsoOnObject|get#onObject;
   }
-  static method AlsoOnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
+  static extension-member method AlsoOnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
     return "object #2";
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.2.expect b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.2.expect
index 49f8dfb615c..db7230ecbb0 100644
--- a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.2.expect
@@ -4,7 +4,7 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
   extension OnObject on dart.core::Object {
     get onObject = lib1::OnObject|get#onObject;
   }
-  static method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
+  static extension-member method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
     return "object #1";
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.3.expect b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.3.expect
index 9dde03dcfcf..e7ff789c603 100644
--- a/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.3.expect
+++ b/pkg/front_end/testcases/incremental/extension_prefix_double_import_then_conflict.yaml.world.3.expect
@@ -4,7 +4,7 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
   extension OnObject on dart.core::Object {
     get onObject = lib1::OnObject|get#onObject;
   }
-  static method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
+  static extension-member method OnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
     return "object #1";
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -12,7 +12,7 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
   extension AlsoOnObject on dart.core::Object {
     get onObject = lib2::AlsoOnObject|get#onObject;
   }
-  static method AlsoOnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
+  static extension-member method AlsoOnObject|get#onObject(lowered final dart.core::Object #this) → dart.core::String
     return "object #2";
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.1.expect b/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.1.expect
index 0e3563219aa..e6b88d0a4ed 100644
--- a/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.1.expect
@@ -5,10 +5,10 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
     method parseInt = lib1::NumberParsing|parseInt;
     tearoff parseInt = lib1::NumberParsing|get#parseInt;
   }
-  static method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
+  static extension-member method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
     return dart.core::int::parse(#this);
   }
-  static method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
+  static extension-member method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
     return () → dart.core::int => lib1::NumberParsing|parseInt(#this);
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -17,10 +17,10 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method fooMe1 = lib2::DuplicateName|fooMe1;
     tearoff fooMe1 = lib2::DuplicateName|get#fooMe1;
   }
-  static method DuplicateName|fooMe1(lowered final dart.core::String #this) → dart.core::String {
+  static extension-member method DuplicateName|fooMe1(lowered final dart.core::String #this) → dart.core::String {
     return "Foo1";
   }
-  static method DuplicateName|get#fooMe1(lowered final dart.core::String #this) → () → dart.core::String
+  static extension-member method DuplicateName|get#fooMe1(lowered final dart.core::String #this) → () → dart.core::String
     return () → dart.core::String => lib2::DuplicateName|fooMe1(#this);
 }
 library from "org-dartlang-test:///lib3.dart" as lib3 {
@@ -29,10 +29,10 @@ library from "org-dartlang-test:///lib3.dart" as lib3 {
     method fooMe2 = lib3::DuplicateName|fooMe2;
     tearoff fooMe2 = lib3::DuplicateName|get#fooMe2;
   }
-  static method DuplicateName|fooMe2(lowered final dart.core::String #this) → dart.core::String {
+  static extension-member method DuplicateName|fooMe2(lowered final dart.core::String #this) → dart.core::String {
     return "Foo2";
   }
-  static method DuplicateName|get#fooMe2(lowered final dart.core::String #this) → () → dart.core::String
+  static extension-member method DuplicateName|get#fooMe2(lowered final dart.core::String #this) → () → dart.core::String
     return () → dart.core::String => lib3::DuplicateName|fooMe2(#this);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.2.expect b/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.2.expect
index 0e3563219aa..e6b88d0a4ed 100644
--- a/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/extension_usage_from_dill.yaml.world.2.expect
@@ -5,10 +5,10 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
     method parseInt = lib1::NumberParsing|parseInt;
     tearoff parseInt = lib1::NumberParsing|get#parseInt;
   }
-  static method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
+  static extension-member method NumberParsing|parseInt(lowered final dart.core::String #this) → dart.core::int {
     return dart.core::int::parse(#this);
   }
-  static method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
+  static extension-member method NumberParsing|get#parseInt(lowered final dart.core::String #this) → () → dart.core::int
     return () → dart.core::int => lib1::NumberParsing|parseInt(#this);
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -17,10 +17,10 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method fooMe1 = lib2::DuplicateName|fooMe1;
     tearoff fooMe1 = lib2::DuplicateName|get#fooMe1;
   }
-  static method DuplicateName|fooMe1(lowered final dart.core::String #this) → dart.core::String {
+  static extension-member method DuplicateName|fooMe1(lowered final dart.core::String #this) → dart.core::String {
     return "Foo1";
   }
-  static method DuplicateName|get#fooMe1(lowered final dart.core::String #this) → () → dart.core::String
+  static extension-member method DuplicateName|get#fooMe1(lowered final dart.core::String #this) → () → dart.core::String
     return () → dart.core::String => lib2::DuplicateName|fooMe1(#this);
 }
 library from "org-dartlang-test:///lib3.dart" as lib3 {
@@ -29,10 +29,10 @@ library from "org-dartlang-test:///lib3.dart" as lib3 {
     method fooMe2 = lib3::DuplicateName|fooMe2;
     tearoff fooMe2 = lib3::DuplicateName|get#fooMe2;
   }
-  static method DuplicateName|fooMe2(lowered final dart.core::String #this) → dart.core::String {
+  static extension-member method DuplicateName|fooMe2(lowered final dart.core::String #this) → dart.core::String {
     return "Foo2";
   }
-  static method DuplicateName|get#fooMe2(lowered final dart.core::String #this) → () → dart.core::String
+  static extension-member method DuplicateName|get#fooMe2(lowered final dart.core::String #this) → () → dart.core::String
     return () → dart.core::String => lib3::DuplicateName|fooMe2(#this);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.1.expect b/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.1.expect
index 69dd3d42662..8cd2e726a2f 100644
--- a/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.1.expect
@@ -5,8 +5,8 @@ library from "org-dartlang-test:///main.dart" as main {
     get field = main::E|get#field;
     set field = main::E|set#field;
   }
-  external static method E|get#field(lowered dart.core::String #this) → dart.core::int;
-  external static method E|set#field(lowered dart.core::String #this, dart.core::int #externalFieldValue) → void;
+  external static extension-member method E|get#field(lowered dart.core::String #this) → dart.core::int;
+  external static extension-member method E|set#field(lowered dart.core::String #this, dart.core::int #externalFieldValue) → void;
   static method main() → dynamic {
     main::E|set#field("foo", main::E|get#field("bar"));
   }
diff --git a/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.2.expect b/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.2.expect
index 69dd3d42662..8cd2e726a2f 100644
--- a/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/external_extension_field.yaml.world.2.expect
@@ -5,8 +5,8 @@ library from "org-dartlang-test:///main.dart" as main {
     get field = main::E|get#field;
     set field = main::E|set#field;
   }
-  external static method E|get#field(lowered dart.core::String #this) → dart.core::int;
-  external static method E|set#field(lowered dart.core::String #this, dart.core::int #externalFieldValue) → void;
+  external static extension-member method E|get#field(lowered dart.core::String #this) → dart.core::int;
+  external static extension-member method E|set#field(lowered dart.core::String #this, dart.core::int #externalFieldValue) → void;
   static method main() → dynamic {
     main::E|set#field("foo", main::E|get#field("bar"));
   }
diff --git a/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.1.expect b/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.1.expect
index 0f30faab532..8d87880b07c 100644
--- a/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.1.expect
@@ -80,41 +80,41 @@ library from "org-dartlang-test:///foo.dart" as foo {
   static const field wid::_WidgetFactory? nullableAlias = #C1;
   static const field wid::_WidgetFactory nonNullableAlias = #C2;
   @#C2
-  static method FooExtension|foo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|foo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#foo(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#foo(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|foo(#this, $creationLocationd_0dea112b090073317d4: #C17);
   @#C2
-  static method FooExtension|bar(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|bar(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#bar(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#bar(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|bar(#this, $creationLocationd_0dea112b090073317d4: #C20);
   @#C1
-  static method FooExtension|baz(lowered final dart.core::Object? #this) → foo::Foo
+  static extension-member method FooExtension|baz(lowered final dart.core::Object? #this) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C23);
-  static method FooExtension|get#baz(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#baz(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|baz(#this);
   @#C2
-  static method FooExtension|boz(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|boz(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#boz(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#boz(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|boz(#this, $creationLocationd_0dea112b090073317d4: #C26);
   @#C2
-  static method FooExtension|constFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|constFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return #C29;
-  static method FooExtension|get#constFoo(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#constFoo(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|constFoo(#this, $creationLocationd_0dea112b090073317d4: #C31);
   @#C2
-  static method FooExtension|get#getterFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|get#getterFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|set#setterFoo(lowered final dart.core::Object? #this, dynamic _, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → void
+  static extension-member method FooExtension|set#setterFoo(lowered final dart.core::Object? #this, dynamic _, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → void
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|unary-(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|unary-(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|staticFoo() → foo::Foo
+  static extension-member method FooExtension|staticFoo() → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C34);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.2.expect b/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.2.expect
index 77e8b035636..935ff3cc1e1 100644
--- a/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/flutter_widget_factory.yaml.world.2.expect
@@ -80,41 +80,41 @@ library from "org-dartlang-test:///foo.dart" as foo {
   static const field wid::_WidgetFactory? nullableAlias = #C1;
   static const field wid::_WidgetFactory nonNullableAlias = #C2;
   @#C2
-  static method FooExtension|foo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|foo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#foo(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#foo(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|foo(#this, $creationLocationd_0dea112b090073317d4: #C17);
   @#C2
-  static method FooExtension|bar(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|bar(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#bar(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#bar(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|bar(#this, $creationLocationd_0dea112b090073317d4: #C20);
   @#C1
-  static method FooExtension|baz(lowered final dart.core::Object? #this) → foo::Foo
+  static extension-member method FooExtension|baz(lowered final dart.core::Object? #this) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C23);
-  static method FooExtension|get#baz(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#baz(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|baz(#this);
   @#C2
-  static method FooExtension|boz(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|boz(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#boz(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#boz(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|boz(#this, $creationLocationd_0dea112b090073317d4: #C26);
   @#C2
-  static method FooExtension|constFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|constFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return #C29;
-  static method FooExtension|get#constFoo(lowered final dart.core::Object? #this) → () → foo::Foo
+  static extension-member method FooExtension|get#constFoo(lowered final dart.core::Object? #this) → () → foo::Foo
     return () → foo::Foo => foo::FooExtension|constFoo(#this, $creationLocationd_0dea112b090073317d4: #C31);
   @#C2
-  static method FooExtension|get#getterFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|get#getterFoo(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|set#setterFoo(lowered final dart.core::Object? #this, dynamic _, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → void
+  static extension-member method FooExtension|set#setterFoo(lowered final dart.core::Object? #this, dynamic _, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → void
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|unary-(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
+  static extension-member method FooExtension|unary-(lowered final dart.core::Object? #this, {wid::_Location? $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
   @#C2
-  static method FooExtension|staticFoo() → foo::Foo
+  static extension-member method FooExtension|staticFoo() → foo::Foo
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: #C34);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.1.expect b/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.1.expect
index b99d086bc15..cbf3780dbfc 100644
--- a/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.1.expect
@@ -81,29 +81,29 @@ library from "org-dartlang-test:///foo.dart" as foo {
   static const field wid::_WidgetFactory* nullableAlias = #C1;
   static const field wid::_WidgetFactory* nonNullableAlias = #C2;
   @#C2
-  static method FooExtension|foo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|foo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#foo(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#foo(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|foo(#this, $creationLocationd_0dea112b090073317d4: #C15);
   @#C2
-  static method FooExtension|bar(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|bar(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#bar(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#bar(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|bar(#this, $creationLocationd_0dea112b090073317d4: #C18);
   @#C1
-  static method FooExtension|baz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|baz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#baz(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#baz(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|baz(#this, $creationLocationd_0dea112b090073317d4: #C21);
   @#C2
-  static method FooExtension|boz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|boz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#boz(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#boz(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|boz(#this, $creationLocationd_0dea112b090073317d4: #C24);
   @#C2
-  static method FooExtension|constFoo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|constFoo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return #C28;
-  static method FooExtension|get#constFoo(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#constFoo(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|constFoo(#this, $creationLocationd_0dea112b090073317d4: #C30);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.2.expect b/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.2.expect
index b722a36a32b..7c6d3c703a3 100644
--- a/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/flutter_widget_factory_legacy.yaml.world.2.expect
@@ -81,29 +81,29 @@ library from "org-dartlang-test:///foo.dart" as foo {
   static const field wid::_WidgetFactory* nullableAlias = #C1;
   static const field wid::_WidgetFactory* nonNullableAlias = #C2;
   @#C2
-  static method FooExtension|foo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|foo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#foo(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#foo(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|foo(#this, $creationLocationd_0dea112b090073317d4: #C15);
   @#C2
-  static method FooExtension|bar(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|bar(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#bar(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#bar(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|bar(#this, $creationLocationd_0dea112b090073317d4: #C18);
   @#C1
-  static method FooExtension|baz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|baz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#baz(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#baz(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|baz(#this, $creationLocationd_0dea112b090073317d4: #C21);
   @#C2
-  static method FooExtension|boz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|boz(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return new foo::Foo::_($creationLocationd_0dea112b090073317d4: $creationLocationd_0dea112b090073317d4);
-  static method FooExtension|get#boz(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#boz(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|boz(#this, $creationLocationd_0dea112b090073317d4: #C24);
   @#C2
-  static method FooExtension|constFoo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
+  static extension-member method FooExtension|constFoo(lowered final dart.core::Object* #this, {wid::_Location* $creationLocationd_0dea112b090073317d4 = #C1}) → foo::Foo*
     return #C28;
-  static method FooExtension|get#constFoo(lowered final dart.core::Object* #this) → () →* foo::Foo*
+  static extension-member method FooExtension|get#constFoo(lowered final dart.core::Object* #this) → () →* foo::Foo*
     return () → foo::Foo* => foo::FooExtension|constFoo(#this, $creationLocationd_0dea112b090073317d4: #C30);
 }
 library from "org-dartlang-test:///main.dart" as main {
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.1.expect
index d6e61ce1d44..b9b1b743447 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.1.expect
@@ -19,18 +19,18 @@ library from "org-dartlang-test:///main.dart" as main {
   }
   static field dart.core::int A2|staticField = 42;
   static final field dart.core::int A2|staticFinalField = 42;
-  static method A2|method1(lowered final main::A1 #this) → main::A1 {
+  static extension-member method A2|method1(lowered final main::A1 #this) → main::A1 {
     return #this;
   }
-  static method A2|get#method1(lowered final main::A1 #this) → () → main::A1
+  static extension-member method A2|get#method1(lowered final main::A1 #this) → () → main::A1
     return () → main::A1 => main::A2|method1(#this);
-  static method A2|get#getter1(lowered final main::A1 #this) → dart.core::String
+  static extension-member method A2|get#getter1(lowered final main::A1 #this) → dart.core::String
     return "42!";
-  static method A2|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
-  static method A2|method2() → main::A1 {
+  static extension-member method A2|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
+  static extension-member method A2|method2() → main::A1 {
     throw "";
   }
-  static get A2|getter2() → dart.core::String
+  static extension-member get A2|getter2() → dart.core::String
     return "42!";
-  static set A2|setter2(dart.core::String s) → void {}
+  static extension-member set A2|setter2(dart.core::String s) → void {}
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.2.expect
index d6e61ce1d44..b9b1b743447 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_19.yaml.world.2.expect
@@ -19,18 +19,18 @@ library from "org-dartlang-test:///main.dart" as main {
   }
   static field dart.core::int A2|staticField = 42;
   static final field dart.core::int A2|staticFinalField = 42;
-  static method A2|method1(lowered final main::A1 #this) → main::A1 {
+  static extension-member method A2|method1(lowered final main::A1 #this) → main::A1 {
     return #this;
   }
-  static method A2|get#method1(lowered final main::A1 #this) → () → main::A1
+  static extension-member method A2|get#method1(lowered final main::A1 #this) → () → main::A1
     return () → main::A1 => main::A2|method1(#this);
-  static method A2|get#getter1(lowered final main::A1 #this) → dart.core::String
+  static extension-member method A2|get#getter1(lowered final main::A1 #this) → dart.core::String
     return "42!";
-  static method A2|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
-  static method A2|method2() → main::A1 {
+  static extension-member method A2|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
+  static extension-member method A2|method2() → main::A1 {
     throw "";
   }
-  static get A2|getter2() → dart.core::String
+  static extension-member get A2|getter2() → dart.core::String
     return "42!";
-  static set A2|setter2(dart.core::String s) → void {}
+  static extension-member set A2|setter2(dart.core::String s) → void {}
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.1.expect
index cb4f3b163a8..85a43704f30 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.1.expect
@@ -17,18 +17,18 @@ library from "org-dartlang-test:///main.dart" as main {
     static set setter2 = set main::_extension#0|setter2;
   }
   static field dart.core::int _extension#0|field = 42;
-  static method _extension#0|method1(lowered final main::A1 #this) → main::A1 {
+  static extension-member method _extension#0|method1(lowered final main::A1 #this) → main::A1 {
     return #this;
   }
-  static method _extension#0|get#method1(lowered final main::A1 #this) → () → main::A1
+  static extension-member method _extension#0|get#method1(lowered final main::A1 #this) → () → main::A1
     return () → main::A1 => main::_extension#0|method1(#this);
-  static method _extension#0|get#getter1(lowered final main::A1 #this) → dart.core::String
+  static extension-member method _extension#0|get#getter1(lowered final main::A1 #this) → dart.core::String
     return "42!";
-  static method _extension#0|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
-  static method _extension#0|method2() → main::A1 {
+  static extension-member method _extension#0|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
+  static extension-member method _extension#0|method2() → main::A1 {
     throw "";
   }
-  static get _extension#0|getter2() → dart.core::String
+  static extension-member get _extension#0|getter2() → dart.core::String
     return "42!";
-  static set _extension#0|setter2(dart.core::String s) → void {}
+  static extension-member set _extension#0|setter2(dart.core::String s) → void {}
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.2.expect
index cb4f3b163a8..85a43704f30 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_20.yaml.world.2.expect
@@ -17,18 +17,18 @@ library from "org-dartlang-test:///main.dart" as main {
     static set setter2 = set main::_extension#0|setter2;
   }
   static field dart.core::int _extension#0|field = 42;
-  static method _extension#0|method1(lowered final main::A1 #this) → main::A1 {
+  static extension-member method _extension#0|method1(lowered final main::A1 #this) → main::A1 {
     return #this;
   }
-  static method _extension#0|get#method1(lowered final main::A1 #this) → () → main::A1
+  static extension-member method _extension#0|get#method1(lowered final main::A1 #this) → () → main::A1
     return () → main::A1 => main::_extension#0|method1(#this);
-  static method _extension#0|get#getter1(lowered final main::A1 #this) → dart.core::String
+  static extension-member method _extension#0|get#getter1(lowered final main::A1 #this) → dart.core::String
     return "42!";
-  static method _extension#0|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
-  static method _extension#0|method2() → main::A1 {
+  static extension-member method _extension#0|set#setter1(lowered final main::A1 #this, dart.core::String s) → void {}
+  static extension-member method _extension#0|method2() → main::A1 {
     throw "";
   }
-  static get _extension#0|getter2() → dart.core::String
+  static extension-member get _extension#0|getter2() → dart.core::String
     return "42!";
-  static set _extension#0|setter2(dart.core::String s) → void {}
+  static extension-member set _extension#0|setter2(dart.core::String s) → void {}
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.1.expect
index 85a31ea08ec..fba9ea7aea9 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.1.expect
@@ -75,24 +75,24 @@ library from "org-dartlang-test:///main.dart" as main {
       main::_#field4#isSet = true;
       main::_#field4 = field4#param;
     }
-  static get _extension#0|field5() → dart.core::int? {
+  static extension-member get _extension#0|field5() → dart.core::int? {
     if(!main::_#_extension#0|field5#isSet) {
       main::_#_extension#0|field5 = 42;
       main::_#_extension#0|field5#isSet = true;
     }
     return main::_#_extension#0|field5;
   }
-  static set _extension#0|field5(dart.core::int? field5#param) → void {
+  static extension-member set _extension#0|field5(dart.core::int? field5#param) → void {
     main::_#_extension#0|field5#isSet = true;
     main::_#_extension#0|field5 = field5#param;
   }
-  static get _extension#0|field6() → dart.core::int?
+  static extension-member get _extension#0|field6() → dart.core::int?
     return main::_#_extension#0|field6#isSet ?{dart.core::int?} main::_#_extension#0|field6 : throw new dart._internal::LateError::fieldNI("field6");
-  static set _extension#0|field6(dart.core::int? field6#param) → void {
+  static extension-member set _extension#0|field6(dart.core::int? field6#param) → void {
     main::_#_extension#0|field6#isSet = true;
     main::_#_extension#0|field6 = field6#param;
   }
-  static get _extension#0|field7() → dart.core::int? {
+  static extension-member get _extension#0|field7() → dart.core::int? {
     if(!main::_#_extension#0|field7#isSet) {
       final dart.core::int? #t2 = 42;
       if(main::_#_extension#0|field7#isSet)
@@ -102,9 +102,9 @@ library from "org-dartlang-test:///main.dart" as main {
     }
     return main::_#_extension#0|field7;
   }
-  static get _extension#0|field8() → dart.core::int?
+  static extension-member get _extension#0|field8() → dart.core::int?
     return main::_#_extension#0|field8#isSet ?{dart.core::int?} main::_#_extension#0|field8 : throw new dart._internal::LateError::fieldNI("field8");
-  static set _extension#0|field8(dart.core::int? field8#param) → void
+  static extension-member set _extension#0|field8(dart.core::int? field8#param) → void
     if(main::_#_extension#0|field8#isSet)
       throw new dart._internal::LateError::fieldAI("field8");
     else {
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.2.expect
index dd9557c034f..95d2b395bec 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_31.yaml.world.2.expect
@@ -75,24 +75,24 @@ library from "org-dartlang-test:///main.dart" as main {
       main::_#field4#isSet = true;
       main::_#field4 = field4#param;
     }
-  static get _extension#0|field5() → dart.core::int? {
+  static extension-member get _extension#0|field5() → dart.core::int? {
     if(!main::_#_extension#0|field5#isSet) {
       main::_#_extension#0|field5 = 42;
       main::_#_extension#0|field5#isSet = true;
     }
     return main::_#_extension#0|field5;
   }
-  static set _extension#0|field5(dart.core::int? field5#param) → void {
+  static extension-member set _extension#0|field5(dart.core::int? field5#param) → void {
     main::_#_extension#0|field5#isSet = true;
     main::_#_extension#0|field5 = field5#param;
   }
-  static get _extension#0|field6() → dart.core::int?
+  static extension-member get _extension#0|field6() → dart.core::int?
     return main::_#_extension#0|field6#isSet ?{dart.core::int?} main::_#_extension#0|field6 : throw new dart._internal::LateError::fieldNI("field6");
-  static set _extension#0|field6(dart.core::int? field6#param) → void {
+  static extension-member set _extension#0|field6(dart.core::int? field6#param) → void {
     main::_#_extension#0|field6#isSet = true;
     main::_#_extension#0|field6 = field6#param;
   }
-  static get _extension#0|field7() → dart.core::int? {
+  static extension-member get _extension#0|field7() → dart.core::int? {
     if(!main::_#_extension#0|field7#isSet) {
       final dart.core::int? #t2 = 42;
       if(main::_#_extension#0|field7#isSet)
@@ -102,9 +102,9 @@ library from "org-dartlang-test:///main.dart" as main {
     }
     return main::_#_extension#0|field7;
   }
-  static get _extension#0|field8() → dart.core::int?
+  static extension-member get _extension#0|field8() → dart.core::int?
     return main::_#_extension#0|field8#isSet ?{dart.core::int?} main::_#_extension#0|field8 : throw new dart._internal::LateError::fieldNI("field8");
-  static set _extension#0|field8(dart.core::int? field8#param) → void
+  static extension-member set _extension#0|field8(dart.core::int? field8#param) → void
     if(main::_#_extension#0|field8#isSet)
       throw new dart._internal::LateError::fieldAI("field8");
     else {
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.1.expect
index fe03bc94f13..12bdf638101 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.1.expect
@@ -12,8 +12,8 @@ additionalExports = (main::main,
     method method2 = lib1::Extension2|method2;
     tearoff method2 = lib1::Extension2|get#method2;
   }
-  static method Extension2|method2(lowered final main::Class #this) → void {}
-  static method Extension2|get#method2(lowered final main::Class #this) → () → void
+  static extension-member method Extension2|method2(lowered final main::Class #this) → void {}
+  static extension-member method Extension2|get#method2(lowered final main::Class #this) → () → void
     return () → void => lib1::Extension2|method2(#this);
   static method lib1() → dynamic {
     main::Class a = new main::Class::•();
@@ -30,8 +30,8 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method method3 = lib2::Extension3|method3;
     tearoff method3 = lib2::Extension3|get#method3;
   }
-  static method Extension3|method3(lowered final main::Class #this) → void {}
-  static method Extension3|get#method3(lowered final main::Class #this) → () → void
+  static extension-member method Extension3|method3(lowered final main::Class #this) → void {}
+  static extension-member method Extension3|get#method3(lowered final main::Class #this) → () → void
     return () → void => lib2::Extension3|method3(#this);
   static method lib2() → dynamic {
     main::Class a = new main::Class::•();
@@ -55,8 +55,8 @@ library from "org-dartlang-test:///main.dart" as main {
     method method = main::Extension|method;
     tearoff method = main::Extension|get#method;
   }
-  static method Extension|method(lowered final main::Class #this) → void {}
-  static method Extension|get#method(lowered final main::Class #this) → () → void
+  static extension-member method Extension|method(lowered final main::Class #this) → void {}
+  static extension-member method Extension|get#method(lowered final main::Class #this) → () → void
     return () → void => main::Extension|method(#this);
   static method main() → dynamic {
     main::Class a = new main::Class::•();
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.2.expect
index 530efd6057e..a39ee9c841c 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.2.expect
@@ -12,8 +12,8 @@ additionalExports = (main::main,
     method method2 = lib1::Extension2|method2;
     tearoff method2 = lib1::Extension2|get#method2;
   }
-  static method Extension2|method2(lowered final main::Class #this) → void {}
-  static method Extension2|get#method2(lowered final main::Class #this) → () → void
+  static extension-member method Extension2|method2(lowered final main::Class #this) → void {}
+  static extension-member method Extension2|get#method2(lowered final main::Class #this) → () → void
     return () → void => lib1::Extension2|method2(#this);
   static method lib1() → dynamic {
     main::Class a = new main::Class::•();
@@ -30,8 +30,8 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method method3 = lib2::Extension3|method3;
     tearoff method3 = lib2::Extension3|get#method3;
   }
-  static method Extension3|method3(lowered final main::Class #this) → void {}
-  static method Extension3|get#method3(lowered final main::Class #this) → () → void
+  static extension-member method Extension3|method3(lowered final main::Class #this) → void {}
+  static extension-member method Extension3|get#method3(lowered final main::Class #this) → () → void
     return () → void => lib2::Extension3|method3(#this);
   static method lib2() → dynamic {
     main::Class a = new main::Class::•();
@@ -55,8 +55,8 @@ library from "org-dartlang-test:///main.dart" as main {
     method method = main::Extension|method;
     tearoff method = main::Extension|get#method;
   }
-  static method Extension|method(lowered final main::Class #this) → void {}
-  static method Extension|get#method(lowered final main::Class #this) → () → void
+  static extension-member method Extension|method(lowered final main::Class #this) → void {}
+  static extension-member method Extension|get#method(lowered final main::Class #this) → () → void
     return () → void => main::Extension|method(#this);
   static method main() → dynamic {
     main::Class a = new main::Class::•();
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.3.expect b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.3.expect
index ad214103b2a..9304aae2119 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.3.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.3.expect
@@ -12,8 +12,8 @@ additionalExports = (main::main,
     method method2 = lib1::Extension2|method2;
     tearoff method2 = lib1::Extension2|get#method2;
   }
-  static method Extension2|method2(lowered final main::Class #this) → void {}
-  static method Extension2|get#method2(lowered final main::Class #this) → () → void
+  static extension-member method Extension2|method2(lowered final main::Class #this) → void {}
+  static extension-member method Extension2|get#method2(lowered final main::Class #this) → () → void
     return () → void => lib1::Extension2|method2(#this);
   static method lib1() → dynamic {
     main::Class a = new main::Class::•();
@@ -30,8 +30,8 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method method3 = lib2::Extension3|method3;
     tearoff method3 = lib2::Extension3|get#method3;
   }
-  static method Extension3|method3(lowered final main::Class #this) → void {}
-  static method Extension3|get#method3(lowered final main::Class #this) → () → void
+  static extension-member method Extension3|method3(lowered final main::Class #this) → void {}
+  static extension-member method Extension3|get#method3(lowered final main::Class #this) → () → void
     return () → void => lib2::Extension3|method3(#this);
   static method lib2() → dynamic {
     main::Class a = new main::Class::•();
@@ -56,8 +56,8 @@ library from "org-dartlang-test:///main.dart" as main {
     method method = main::Extension|method;
     tearoff method = main::Extension|get#method;
   }
-  static method Extension|method(lowered final main::Class #this) → void {}
-  static method Extension|get#method(lowered final main::Class #this) → () → void
+  static extension-member method Extension|method(lowered final main::Class #this) → void {}
+  static extension-member method Extension|get#method(lowered final main::Class #this) → () → void
     return () → void => main::Extension|method(#this);
   static method main() → dynamic {
     main::Class a = new main::Class::•();
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.4.expect b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.4.expect
index 908cbff4001..a24b1ea37b3 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.4.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_34.yaml.world.4.expect
@@ -12,8 +12,8 @@ additionalExports = (main::main,
     method method2 = lib1::Extension2|method2;
     tearoff method2 = lib1::Extension2|get#method2;
   }
-  static method Extension2|method2(lowered final main::Class #this) → void {}
-  static method Extension2|get#method2(lowered final main::Class #this) → () → void
+  static extension-member method Extension2|method2(lowered final main::Class #this) → void {}
+  static extension-member method Extension2|get#method2(lowered final main::Class #this) → () → void
     return () → void => lib1::Extension2|method2(#this);
   static method lib1() → dynamic {
     main::Class a = new main::Class::•();
@@ -31,8 +31,8 @@ library from "org-dartlang-test:///lib2.dart" as lib2 {
     method method3 = lib2::Extension3|method3;
     tearoff method3 = lib2::Extension3|get#method3;
   }
-  static method Extension3|method3(lowered final main::Class #this) → void {}
-  static method Extension3|get#method3(lowered final main::Class #this) → () → void
+  static extension-member method Extension3|method3(lowered final main::Class #this) → void {}
+  static extension-member method Extension3|get#method3(lowered final main::Class #this) → () → void
     return () → void => lib2::Extension3|method3(#this);
   static method lib2() → dynamic {
     main::Class a = new main::Class::•();
@@ -57,8 +57,8 @@ library from "org-dartlang-test:///main.dart" as main {
     method method = main::Extension|method;
     tearoff method = main::Extension|get#method;
   }
-  static method Extension|method(lowered final main::Class #this) → void {}
-  static method Extension|get#method(lowered final main::Class #this) → () → void
+  static extension-member method Extension|method(lowered final main::Class #this) → void {}
+  static extension-member method Extension|get#method(lowered final main::Class #this) → () → void
     return () → void => main::Extension|method(#this);
   static method main() → dynamic {
     main::Class a = new main::Class::•();
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.1.expect
index 5b3c74f870d..0ecd2f2df94 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.1.expect
@@ -7,9 +7,9 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
     method baz = lib1::Extension1|baz;
     tearoff baz = lib1::Extension1|get#baz;
   }
-  static method Extension1|baz(lowered final main::A #this) → dynamic
+  static extension-member method Extension1|baz(lowered final main::A #this) → dynamic
     return 42;
-  static method Extension1|get#baz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension1|get#baz(lowered final main::A #this) → () → dynamic
     return () → dynamic => lib1::Extension1|baz(#this);
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -46,9 +46,9 @@ library from "org-dartlang-test:///main.dart" as main {
   static method main() → dynamic {
     lib2::method(new main::A::•());
   }
-  static method Extension2|boz(lowered final main::A #this) → dynamic {
+  static extension-member method Extension2|boz(lowered final main::A #this) → dynamic {
     return 87;
   }
-  static method Extension2|get#boz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension2|get#boz(lowered final main::A #this) → () → dynamic
     return () → dynamic => main::Extension2|boz(#this);
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.2.expect
index ce2d9af7a86..d982a50673b 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.2.expect
@@ -7,9 +7,9 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
     method baz = lib1::Extension1|baz;
     tearoff baz = lib1::Extension1|get#baz;
   }
-  static method Extension1|baz(lowered final main::A #this) → dynamic
+  static extension-member method Extension1|baz(lowered final main::A #this) → dynamic
     return 42;
-  static method Extension1|get#baz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension1|get#baz(lowered final main::A #this) → () → dynamic
     return () → dynamic => lib1::Extension1|baz(#this);
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -47,9 +47,9 @@ library from "org-dartlang-test:///main.dart" as main {
   static method main() → dynamic {
     lib2::method(new main::A::•());
   }
-  static method Extension2|boz(lowered final main::A #this) → dynamic {
+  static extension-member method Extension2|boz(lowered final main::A #this) → dynamic {
     return 87;
   }
-  static method Extension2|get#boz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension2|get#boz(lowered final main::A #this) → () → dynamic
     return () → dynamic => main::Extension2|boz(#this);
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.3.expect b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.3.expect
index e66dc79569e..4be26762964 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.3.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_40.yaml.world.3.expect
@@ -7,9 +7,9 @@ library from "org-dartlang-test:///lib1.dart" as lib1 {
     method baz = lib1::Extension1|baz;
     tearoff baz = lib1::Extension1|get#baz;
   }
-  static method Extension1|baz(lowered final main::A #this) → dynamic
+  static extension-member method Extension1|baz(lowered final main::A #this) → dynamic
     return 42;
-  static method Extension1|get#baz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension1|get#baz(lowered final main::A #this) → () → dynamic
     return () → dynamic => lib1::Extension1|baz(#this);
 }
 library from "org-dartlang-test:///lib2.dart" as lib2 {
@@ -47,9 +47,9 @@ library from "org-dartlang-test:///main.dart" as main {
   static method main() → dynamic {
     lib2::method(new main::A::•());
   }
-  static method Extension2|boz(lowered final main::A #this) → dynamic {
+  static extension-member method Extension2|boz(lowered final main::A #this) → dynamic {
     return 123;
   }
-  static method Extension2|get#boz(lowered final main::A #this) → () → dynamic
+  static extension-member method Extension2|get#boz(lowered final main::A #this) → () → dynamic
     return () → dynamic => main::Extension2|boz(#this);
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.1.expect b/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.1.expect
index 931579ab59e..35f58483999 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.1.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.1.expect
@@ -6,7 +6,7 @@ library from "org-dartlang-test:///main.dart" as main {
     tearoff x = main::Foo|get#x;
   }
   late static final field dart.core::int x = 42;
-  static method Foo|x(lowered final dart.core::int #this) → void {}
-  static method Foo|get#x(lowered final dart.core::int #this) → () → void
+  static extension-member method Foo|x(lowered final dart.core::int #this) → void {}
+  static extension-member method Foo|get#x(lowered final dart.core::int #this) → () → void
     return () → void => main::Foo|x(#this);
 }
diff --git a/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.2.expect b/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.2.expect
index 931579ab59e..35f58483999 100644
--- a/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.2.expect
+++ b/pkg/front_end/testcases/incremental/no_outline_change_47.yaml.world.2.expect
@@ -6,7 +6,7 @@ library from "org-dartlang-test:///main.dart" as main {
     tearoff x = main::Foo|get#x;
   }
   late static final field dart.core::int x = 42;
-  static method Foo|x(lowered final dart.core::int #this) → void {}
-  static method Foo|get#x(lowered final dart.core::int #this) → () → void
+  static extension-member method Foo|x(lowered final dart.core::int #this) → void {}
+  static extension-member method Foo|get#x(lowered final dart.core::int #this) → () → void
     return () → void => main::Foo|x(#this);
 }
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.expect
index dae5b374724..8b30c3c0b69 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.expect
@@ -141,89 +141,89 @@ static method testParenthesizedTwiceNamed(core::int i) → dynamic {
     x;
   });
 }
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   return throw "";
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   return throw "";
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a = #C1, T% b = #C1}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
   return throw "";
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a = #C1}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   return throw "";
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   return throw "";
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   return throw "";
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   return throw "";
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   return throw "";
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   return throw "";
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   return throw "";
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.transformed.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.transformed.expect
index 1928a9c9f8e..cac240d6f9c 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.strong.transformed.expect
@@ -141,89 +141,89 @@ static method testParenthesizedTwiceNamed(core::int i) → dynamic {
     x;
   });
 }
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   return throw "";
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   return throw "";
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a = #C1, T% b = #C1}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
   return throw "";
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a = #C1}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   return throw "";
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   return throw "";
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   return throw "";
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   return throw "";
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   return throw "";
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   return throw "";
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   return throw "";
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.expect
index dae5b374724..8b30c3c0b69 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.expect
@@ -141,89 +141,89 @@ static method testParenthesizedTwiceNamed(core::int i) → dynamic {
     x;
   });
 }
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   return throw "";
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   return throw "";
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a = #C1, T% b = #C1}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
   return throw "";
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a = #C1}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   return throw "";
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   return throw "";
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   return throw "";
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   return throw "";
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   return throw "";
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   return throw "";
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   return throw "";
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.modular.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.modular.expect
index dae5b374724..8b30c3c0b69 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.modular.expect
@@ -141,89 +141,89 @@ static method testParenthesizedTwiceNamed(core::int i) → dynamic {
     x;
   });
 }
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   return throw "";
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   return throw "";
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a = #C1, T% b = #C1}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
   return throw "";
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a = #C1}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   return throw "";
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   return throw "";
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   return throw "";
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   return throw "";
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   return throw "";
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   return throw "";
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   return throw "";
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.outline.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.outline.expect
index d6b8ef8f7cb..fe49df9c52c 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.outline.expect
@@ -88,89 +88,89 @@ static method testParenthesizedTwice(core::int i) → dynamic
   ;
 static method testParenthesizedTwiceNamed(core::int i) → dynamic
   ;
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   ;
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a}) → void
   ;
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   ;
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a, (T%) → void b}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a, required (self::_extension#0|_laterNamedParameter::T%) → void b}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a, required (self::_extension#0|_laterNamedParameter::T%) → void b}) → void
   ;
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a, T% b}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a, required self::_extension#0|_earlierNamedParameter::T% b}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a, required self::_extension#0|_earlierNamedParameter::T% b}) → void
   ;
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a}) → void
   ;
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   ;
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   ;
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   ;
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   ;
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   ;
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   ;
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   ;
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   ;
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   ;
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   ;
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   ;
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   ;
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a, required (self::_extension#0|_parenthesizedNamed::T%) → void b}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a, required (self::_extension#0|_parenthesizedNamed::T%) → void b}) → void
   ;
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a, (T%) → void b}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   ;
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b}) → void
   ;
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a, (T%) → void b}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.transformed.expect b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.transformed.expect
index 1928a9c9f8e..cac240d6f9c 100644
--- a/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_1/horizontal_inference_extension_method.dart.weak.transformed.expect
@@ -141,89 +141,89 @@ static method testParenthesizedTwiceNamed(core::int i) → dynamic {
     x;
   });
 }
-static method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
+static extension-member method _extension#0|_laterUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_laterUnnamedParameter::T% x, (self::_extension#0|_laterUnnamedParameter::T%) → void y) → self::_extension#0|_laterUnnamedParameter::T%
   return throw "";
-static method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
+static extension-member method _extension#0|get#_laterUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → T%
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → T% => self::_extension#0|_laterUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
+static extension-member method _extension#0|_laterUnnamedParameterDependsOnNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T%) → void x, {required self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter::T% a = #C1}) → void
   return throw "";
-static method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
+static extension-member method _extension#0|get#_laterUnnamedParameterDependsOnNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, {a: T%}) → void
   return <T extends core::Object? = dynamic>((T%) → void x, {T% a = #C1}) → void => self::_extension#0|_laterUnnamedParameterDependsOnNamedParameter<T%>(#this, x, a: a);
-static method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
+static extension-member method _extension#0|_earlierUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_earlierUnnamedParameter::T%) → void x, self::_extension#0|_earlierUnnamedParameter::T% y) → void
   return throw "";
-static method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
+static extension-member method _extension#0|get#_earlierUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>((T%) → void, T%) → void
   return <T extends core::Object? = dynamic>((T%) → void x, T% y) → void => self::_extension#0|_earlierUnnamedParameter<T%>(#this, x, y);
-static method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_laterNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_laterNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_laterNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_laterNamedParameter::T% a = #C1, required (self::_extension#0|_laterNamedParameter::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
+static extension-member method _extension#0|get#_earlierNamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: (T%) → void, b: T%}) → void
   return <T extends core::Object? = dynamic>({(T%) → void a = #C1, T% b = #C1}) → void => self::_extension#0|_earlierNamedParameter<T%>(#this, a: a, b: b);
-static method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, {required (self::_extension#0|_earlierNamedParameter::T%) → void a = #C1, required self::_extension#0|_earlierNamedParameter::T% b = #C1}) → void
   return throw "";
-static method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
+static extension-member method _extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T% b, {required (self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter::T%) → void a = #C1}) → void
   return throw "";
-static method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
+static extension-member method _extension#0|get#_earlierNamedParameterDependsOnUnnamedParameter(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, {a: (T%) → void}) → void
   return <T extends core::Object? = dynamic>(T% b, {(T%) → void a = #C1}) → void => self::_extension#0|_earlierNamedParameterDependsOnUnnamedParameter<T%>(#this, b, a: a);
-static method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
+static extension-member method _extension#0|_propagateToReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_propagateToReturnType::T% x, (self::_extension#0|_propagateToReturnType::T%) → self::_extension#0|_propagateToReturnType::U% y) → self::_extension#0|_propagateToReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
+static extension-member method _extension#0|_closureAsParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_closureAsParameterType::T% x, (self::_extension#0|_closureAsParameterType::T%) → self::_extension#0|_closureAsParameterType::U% y) → self::_extension#0|_closureAsParameterType::U%
   return throw "";
-static method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_closureAsParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(T% x, (T%) → U% y) → U% => self::_extension#0|_closureAsParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
+static extension-member method _extension#0|_propagateToEarlierClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_propagateToEarlierClosure::T%) → self::_extension#0|_propagateToEarlierClosure::U% x, () → self::_extension#0|_propagateToEarlierClosure::T% y) → self::_extension#0|_propagateToEarlierClosure::U%
   return throw "";
-static method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
+static extension-member method _extension#0|get#_propagateToEarlierClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U%, () → T%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((T%) → U% x, () → T% y) → U% => self::_extension#0|_propagateToEarlierClosure<T%, U%>(#this, x, y);
-static method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateToLaterClosure(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, (T%) → U% y) → U% => self::_extension#0|_propagateToLaterClosure<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
+static extension-member method _extension#0|_propagateToLaterClosure<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToLaterClosure::T% x, (self::_extension#0|_propagateToLaterClosure::T%) → self::_extension#0|_propagateToLaterClosure::U% y) → self::_extension#0|_propagateToLaterClosure::U%
   return throw "";
-static method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
+static extension-member method _extension#0|_longDependencyChain<T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_longDependencyChain::T% x, (self::_extension#0|_longDependencyChain::T%) → self::_extension#0|_longDependencyChain::U% y, (self::_extension#0|_longDependencyChain::U%) → self::_extension#0|_longDependencyChain::V% z) → self::_extension#0|_longDependencyChain::V%
   return throw "";
-static method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
+static extension-member method _extension#0|get#_longDependencyChain(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T%, (T%) → U%, (U%) → V%) → V%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic, V extends core::Object? = dynamic>(() → T% x, (T%) → U% y, (U%) → V% z) → V% => self::_extension#0|_longDependencyChain<T%, U%, V%>(#this, x, y, z);
-static method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
+static extension-member method _extension#0|_dependencyCycle<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, (self::_extension#0|_dependencyCycle::U%) → self::_extension#0|_dependencyCycle::T% x, (self::_extension#0|_dependencyCycle::T%) → self::_extension#0|_dependencyCycle::U% y) → core::Map<self::_extension#0|_dependencyCycle::T%, self::_extension#0|_dependencyCycle::U%>
   return throw "";
-static method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
+static extension-member method _extension#0|get#_dependencyCycle(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T%, (T%) → U%) → core::Map<T%, U%>
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>((U%) → T% x, (T%) → U% y) → core::Map<T%, U%> => self::_extension#0|_dependencyCycle<T%, U%>(#this, x, y);
-static method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
+static extension-member method _extension#0|_propagateFromContravariantReturnType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → (self::_extension#0|_propagateFromContravariantReturnType::T%) → void x, (self::_extension#0|_propagateFromContravariantReturnType::T%) → self::_extension#0|_propagateFromContravariantReturnType::U% y) → self::_extension#0|_propagateFromContravariantReturnType::U%
   return throw "";
-static method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
+static extension-member method _extension#0|get#_propagateFromContravariantReturnType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void, (T%) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → (T%) → void x, (T%) → U% y) → U% => self::_extension#0|_propagateFromContravariantReturnType<T%, U%>(#this, x, y);
-static method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
+static extension-member method _extension#0|_propagateToContravariantParameterType<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_propagateToContravariantParameterType::T% x, ((self::_extension#0|_propagateToContravariantParameterType::T%) → void) → self::_extension#0|_propagateToContravariantParameterType::U% y) → self::_extension#0|_propagateToContravariantParameterType::U%
   return throw "";
-static method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
+static extension-member method _extension#0|get#_propagateToContravariantParameterType(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T%, ((T%) → void) → U%) → U%
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → T% x, ((T%) → void) → U% y) → U% => self::_extension#0|_propagateToContravariantParameterType<T%, U%>(#this, x, y);
-static method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
+static extension-member method _extension#0|_returnTypeRefersToMultipleTypeVars<T extends core::Object? = dynamic, U extends core::Object? = dynamic>(lowered final core::int #this, () → core::Map<self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%, self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%> x, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::T%) → void y, (self::_extension#0|_returnTypeRefersToMultipleTypeVars::U%) → void z) → void
   return throw "";
-static method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
+static extension-member method _extension#0|get#_returnTypeRefersToMultipleTypeVars(lowered final core::int #this) → <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%>, (T%) → void, (U%) → void) → void
   return <T extends core::Object? = dynamic, U extends core::Object? = dynamic>(() → core::Map<T%, U%> x, (T%) → void y, (U%) → void z) → void => self::_extension#0|_returnTypeRefersToMultipleTypeVars<T%, U%>(#this, x, y, z);
-static method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
+static extension-member method _extension#0|_unnecessaryDueToNoDependency<T extends core::Object? = dynamic>(lowered final core::int #this, () → self::_extension#0|_unnecessaryDueToNoDependency::T% x, self::_extension#0|_unnecessaryDueToNoDependency::T% y) → self::_extension#0|_unnecessaryDueToNoDependency::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToNoDependency(lowered final core::int #this) → <T extends core::Object? = dynamic>(() → T%, T%) → T%
   return <T extends core::Object? = dynamic>(() → T% x, T% y) → T% => self::_extension#0|_unnecessaryDueToNoDependency<T%>(#this, x, y);
-static method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
+static extension-member method _extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% x, ({required x: self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%, required y: core::int}) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T% y) → self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed::T%
   return throw "";
-static method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
+static extension-member method _extension#0|get#_unnecessaryDueToExplicitParameterTypeNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, ({required x: T%, required y: core::int}) → T%) → T%
   return <T extends core::Object? = dynamic>(T% x, ({required x: T%, required y: core::int}) → T% y) → T% => self::_extension#0|_unnecessaryDueToExplicitParameterTypeNamed<T%>(#this, x, y);
-static method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
+static extension-member method _extension#0|_parenthesized<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesized::T% x, (self::_extension#0|_parenthesized::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesized(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesized<T%>(#this, x, y);
-static method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedNamed::T% a = #C1, required (self::_extension#0|_parenthesizedNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedNamed<T%>(#this, a: a, b: b);
-static method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
+static extension-member method _extension#0|_parenthesizedTwice<T extends core::Object? = dynamic>(lowered final core::int #this, self::_extension#0|_parenthesizedTwice::T% x, (self::_extension#0|_parenthesizedTwice::T%) → void y) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
+static extension-member method _extension#0|get#_parenthesizedTwice(lowered final core::int #this) → <T extends core::Object? = dynamic>(T%, (T%) → void) → void
   return <T extends core::Object? = dynamic>(T% x, (T%) → void y) → void => self::_extension#0|_parenthesizedTwice<T%>(#this, x, y);
-static method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
+static extension-member method _extension#0|_parenthesizedTwiceNamed<T extends core::Object? = dynamic>(lowered final core::int #this, {required self::_extension#0|_parenthesizedTwiceNamed::T% a = #C1, required (self::_extension#0|_parenthesizedTwiceNamed::T%) → void b = #C1}) → void
   return throw "";
-static method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
+static extension-member method _extension#0|get#_parenthesizedTwiceNamed(lowered final core::int #this) → <T extends core::Object? = dynamic>({a: T%, b: (T%) → void}) → void
   return <T extends core::Object? = dynamic>({T% a = #C1, (T%) → void b = #C1}) → void => self::_extension#0|_parenthesizedTwiceNamed<T%>(#this, a: a, b: b);
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.expect
index 1b20e91fb72..e455e382913 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.expect
@@ -11,7 +11,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void {
   if(!(c.{self::C::_f1}{core::int?} == null)) {
     core::int? x = c.{self::C::_f1}{core::int?};
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.transformed.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.transformed.expect
index 1b20e91fb72..e455e382913 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.strong.transformed.expect
@@ -11,7 +11,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void {
   if(!(c.{self::C::_f1}{core::int?} == null)) {
     core::int? x = c.{self::C::_f1}{core::int?};
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.expect
index 1b20e91fb72..e455e382913 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.expect
@@ -11,7 +11,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void {
   if(!(c.{self::C::_f1}{core::int?} == null)) {
     core::int? x = c.{self::C::_f1}{core::int?};
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.modular.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.modular.expect
index 1b20e91fb72..e455e382913 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.modular.expect
@@ -11,7 +11,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void {
   if(!(c.{self::C::_f1}{core::int?} == null)) {
     core::int? x = c.{self::C::_f1}{core::int?};
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.outline.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.outline.expect
index 45a2a1a8c2b..2da049c2703 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.outline.expect
@@ -10,7 +10,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void
   ;
 static method testExternalFieldInExtension(self::C c) → void
diff --git a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.transformed.expect b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.transformed.expect
index 1b20e91fb72..e455e382913 100644
--- a/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_2/external_field.dart.weak.transformed.expect
@@ -11,7 +11,7 @@ abstract class C extends core::Object {
 extension /* unnamed */ _extension#0 on self::C {
   get _f2 = self::_extension#0|get#_f2;
 }
-external static method _extension#0|get#_f2(lowered self::C #this) → core::int?;
+external static extension-member method _extension#0|get#_f2(lowered self::C #this) → core::int?;
 static method testExternalFieldInClass(self::C c) → void {
   if(!(c.{self::C::_f1}{core::int?} == null)) {
     core::int? x = c.{self::C::_f1}{core::int?};
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.expect
index c2ddb8e0edc..78d4bdb37b0 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.expect
@@ -53,7 +53,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   return 0;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   return 0;
 static method acceptsInt(core::int x) → void {}
 static method testFinalField(self::C c) → void {
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.transformed.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.transformed.expect
index c2ddb8e0edc..78d4bdb37b0 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.strong.transformed.expect
@@ -53,7 +53,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   return 0;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   return 0;
 static method acceptsInt(core::int x) → void {}
 static method testFinalField(self::C c) → void {
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.expect
index c2ddb8e0edc..78d4bdb37b0 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.expect
@@ -53,7 +53,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   return 0;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   return 0;
 static method acceptsInt(core::int x) → void {}
 static method testFinalField(self::C c) → void {
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.modular.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.modular.expect
index c2ddb8e0edc..78d4bdb37b0 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.modular.expect
@@ -53,7 +53,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   return 0;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   return 0;
 static method acceptsInt(core::int x) → void {}
 static method testFinalField(self::C c) → void {
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.outline.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.outline.expect
index b877f254eb4..efa2c162d3c 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.outline.expect
@@ -51,7 +51,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   ;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   ;
 static method acceptsInt(core::int x) → void
   ;
diff --git a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.transformed.expect b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.transformed.expect
index c2ddb8e0edc..78d4bdb37b0 100644
--- a/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inference_update_2/field_promotion_name_conflicts.dart.weak.transformed.expect
@@ -53,7 +53,7 @@ extension /* unnamed */ _extension#0 on core::String {
 static field core::int? _f8;
 static get _f9() → core::int?
   return 0;
-static method _extension#0|get#_f10(lowered final core::String #this) → core::int?
+static extension-member method _extension#0|get#_f10(lowered final core::String #this) → core::int?
   return 0;
 static method acceptsInt(core::int x) → void {}
 static method testFinalField(self::C c) → void {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect b/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
index ac0d90768b3..8df8afdacb6 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.strong.expect
@@ -10,15 +10,15 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static method A|(core::int i) → self::A {
+static inline-class-member method A|(core::int i) → self::A {
   lowered final self::A #this = i;
   return #this;
 }
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @#C2
-static method A|m(lowered final self::A #this) → void {}
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
index ac0d90768b3..8df8afdacb6 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.strong.transformed.expect
@@ -10,15 +10,15 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static method A|(core::int i) → self::A {
+static inline-class-member method A|(core::int i) → self::A {
   lowered final self::A #this = i;
   return #this;
 }
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @#C2
-static method A|m(lowered final self::A #this) → void {}
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
index ac0d90768b3..8df8afdacb6 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.expect
@@ -10,15 +10,15 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static method A|(core::int i) → self::A {
+static inline-class-member method A|(core::int i) → self::A {
   lowered final self::A #this = i;
   return #this;
 }
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @#C2
-static method A|m(lowered final self::A #this) → void {}
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
index ac0d90768b3..8df8afdacb6 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.modular.expect
@@ -10,15 +10,15 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static method A|(core::int i) → self::A {
+static inline-class-member method A|(core::int i) → self::A {
   lowered final self::A #this = i;
   return #this;
 }
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @#C2
-static method A|m(lowered final self::A #this) → void {}
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
index 97ffb2831b2..f00b1bd2e4c 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.outline.expect
@@ -10,14 +10,14 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @core::Deprecated::•("")
-static method A|(core::int i) → self::A
+static inline-class-member method A|(core::int i) → self::A
   ;
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @core::Deprecated::•("")
-static method A|m(lowered final self::A #this) → void
+static inline-class-member method A|m(lowered final self::A #this) → void
   ;
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 
diff --git a/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
index ac0d90768b3..8df8afdacb6 100644
--- a/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/annotations.dart.weak.transformed.expect
@@ -10,15 +10,15 @@ inline class A /* declaredRepresentationType = core::int */ {
   tearoff • = self::A|_#new#tearOff;
 }
 @#C2
-static method A|(core::int i) → self::A {
+static inline-class-member method A|(core::int i) → self::A {
   lowered final self::A #this = i;
   return #this;
 }
-static method A|_#new#tearOff(core::int i) → self::A
+static inline-class-member method A|_#new#tearOff(core::int i) → self::A
   return self::A|(i);
 @#C2
-static method A|m(lowered final self::A #this) → void {}
-static method A|get#m(lowered final self::A #this) → () → void
+static inline-class-member method A|m(lowered final self::A #this) → void {}
+static inline-class-member method A|get#m(lowered final self::A #this) → () → void
   return () → void => self::A|m(#this);
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
index aa5dfce49a6..69ad55c41e9 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.expect
@@ -12,23 +12,23 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class {
+static inline-class-member method Class|(core::int it) → self::Class {
   lowered final self::Class #this = it;
   return #this;
 }
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class {
+static inline-class-member method Class|named(core::int it) → self::Class {
   lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
   lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
   return #this;
 }
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
   self::Class a = self::Class|(3);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
index aa5dfce49a6..69ad55c41e9 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.strong.transformed.expect
@@ -12,23 +12,23 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class {
+static inline-class-member method Class|(core::int it) → self::Class {
   lowered final self::Class #this = it;
   return #this;
 }
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class {
+static inline-class-member method Class|named(core::int it) → self::Class {
   lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
   lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
   return #this;
 }
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
   self::Class a = self::Class|(3);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
index 2847ef5500a..17c9cb57074 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.expect
@@ -12,23 +12,23 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class {
+static inline-class-member method Class|(core::int it) → self::Class {
   lowered final self::Class #this = it;
   return #this;
 }
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class {
+static inline-class-member method Class|named(core::int it) → self::Class {
   lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
   lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
   return #this;
 }
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
   self::Class a = self::Class|(3);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
index 2847ef5500a..17c9cb57074 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.modular.expect
@@ -12,23 +12,23 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class {
+static inline-class-member method Class|(core::int it) → self::Class {
   lowered final self::Class #this = it;
   return #this;
 }
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class {
+static inline-class-member method Class|named(core::int it) → self::Class {
   lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
   lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
   return #this;
 }
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
   self::Class a = self::Class|(3);
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
index 440150b4312..b7bc31389ed 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.outline.expect
@@ -12,17 +12,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class
+static inline-class-member method Class|(core::int it) → self::Class
   ;
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class
+static inline-class-member method Class|named(core::int it) → self::Class
   ;
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%>
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%>
   ;
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
index 2847ef5500a..17c9cb57074 100644
--- a/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_access.dart.weak.transformed.expect
@@ -12,23 +12,23 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   constructor • = self::GenericClass|;
   tearoff • = self::GenericClass|_#new#tearOff;
 }
-static method Class|(core::int it) → self::Class {
+static inline-class-member method Class|(core::int it) → self::Class {
   lowered final self::Class #this = it;
   return #this;
 }
-static method Class|_#new#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#new#tearOff(core::int it) → self::Class
   return self::Class|(it);
-static method Class|named(core::int it) → self::Class {
+static inline-class-member method Class|named(core::int it) → self::Class {
   lowered final self::Class #this = it.{core::num::+}(1){(core::num) → core::int};
   return #this;
 }
-static method Class|_#named#tearOff(core::int it) → self::Class
+static inline-class-member method Class|_#named#tearOff(core::int it) → self::Class
   return self::Class|named(it);
-static method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
+static inline-class-member method GenericClass|<T extends core::Object? = dynamic>(self::GenericClass|::T% it) → self::GenericClass<self::GenericClass|::T%> {
   lowered final self::GenericClass<self::GenericClass|::T%> #this = it;
   return #this;
 }
-static method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
+static inline-class-member method GenericClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericClass|_#new#tearOff::T% it) → self::GenericClass<self::GenericClass|_#new#tearOff::T%>
   return self::GenericClass|<self::GenericClass|_#new#tearOff::T%>(it);
 static method main() → dynamic {
   self::Class a = self::Class|(3);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
index bd89ac4d9a6..9ba8e61ac20 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.expect
@@ -34,99 +34,99 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1 {
+static inline-class-member method Class1|named3(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1 {
+static inline-class-member method Class1|named6(core::String text) → self::Class1 {
   lowered final self::Class1 #this = text.{core::String::length}{core::int};
   return #this;
 }
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
   lowered final self::Class2<self::Class2|::T%> #this = it;
   return #this;
 }
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
   lowered final self::Class2<self::Class2|named1::T%> #this = it;
   return #this;
 }
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
   lowered final self::Class2<self::Class2|named2::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
   lowered final self::Class2<self::Class2|named3::T%> #this = it;
   return #this;
 }
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
   lowered final self::Class2<self::Class2|named4::T%> #this = it;
   return #this;
 }
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
   lowered final self::Class2<self::Class2|named5::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
   lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
index bd89ac4d9a6..9ba8e61ac20 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.strong.transformed.expect
@@ -34,99 +34,99 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1 {
+static inline-class-member method Class1|named3(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1 {
+static inline-class-member method Class1|named6(core::String text) → self::Class1 {
   lowered final self::Class1 #this = text.{core::String::length}{core::int};
   return #this;
 }
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
   lowered final self::Class2<self::Class2|::T%> #this = it;
   return #this;
 }
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
   lowered final self::Class2<self::Class2|named1::T%> #this = it;
   return #this;
 }
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
   lowered final self::Class2<self::Class2|named2::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
   lowered final self::Class2<self::Class2|named3::T%> #this = it;
   return #this;
 }
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
   lowered final self::Class2<self::Class2|named4::T%> #this = it;
   return #this;
 }
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
   lowered final self::Class2<self::Class2|named5::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
   lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
index bd89ac4d9a6..9ba8e61ac20 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.expect
@@ -34,99 +34,99 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1 {
+static inline-class-member method Class1|named3(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1 {
+static inline-class-member method Class1|named6(core::String text) → self::Class1 {
   lowered final self::Class1 #this = text.{core::String::length}{core::int};
   return #this;
 }
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
   lowered final self::Class2<self::Class2|::T%> #this = it;
   return #this;
 }
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
   lowered final self::Class2<self::Class2|named1::T%> #this = it;
   return #this;
 }
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
   lowered final self::Class2<self::Class2|named2::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
   lowered final self::Class2<self::Class2|named3::T%> #this = it;
   return #this;
 }
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
   lowered final self::Class2<self::Class2|named4::T%> #this = it;
   return #this;
 }
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
   lowered final self::Class2<self::Class2|named5::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
   lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
index bd89ac4d9a6..9ba8e61ac20 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.modular.expect
@@ -34,99 +34,99 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1 {
+static inline-class-member method Class1|named3(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1 {
+static inline-class-member method Class1|named6(core::String text) → self::Class1 {
   lowered final self::Class1 #this = text.{core::String::length}{core::int};
   return #this;
 }
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
   lowered final self::Class2<self::Class2|::T%> #this = it;
   return #this;
 }
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
   lowered final self::Class2<self::Class2|named1::T%> #this = it;
   return #this;
 }
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
   lowered final self::Class2<self::Class2|named2::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
   lowered final self::Class2<self::Class2|named3::T%> #this = it;
   return #this;
 }
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
   lowered final self::Class2<self::Class2|named4::T%> #this = it;
   return #this;
 }
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
   lowered final self::Class2<self::Class2|named5::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
   lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
index 262d6b12f85..4ef0135ec30 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.outline.expect
@@ -34,59 +34,59 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1
+static inline-class-member method Class1|(core::int it) → self::Class1
   ;
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1
   ;
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1
   ;
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1
+static inline-class-member method Class1|named3(core::int it) → self::Class1
   ;
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1
   ;
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1
   ;
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1
+static inline-class-member method Class1|named6(core::String text) → self::Class1
   ;
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%>
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%>
   ;
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%>
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%>
   ;
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%>
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%>
   ;
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%>
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%>
   ;
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%>
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%>
   ;
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%>
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%>
   ;
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%>
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%>
   ;
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
index bd89ac4d9a6..9ba8e61ac20 100644
--- a/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_bodies.dart.weak.transformed.expect
@@ -34,99 +34,99 @@ inline class Class2<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor named6 = self::Class2|named6;
   tearoff named6 = self::Class2|_#named6#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class1|named1(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named1(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named1#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named1(it, additional);
-static method Class1|named2(core::int it, core::int additional) → self::Class1 {
+static inline-class-member method Class1|named2(core::int it, core::int additional) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
+static inline-class-member method Class1|_#named2#tearOff(core::int it, core::int additional) → self::Class1
   return self::Class1|named2(it, additional);
-static method Class1|named3(core::int it) → self::Class1 {
+static inline-class-member method Class1|named3(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named3#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#named3#tearOff(core::int it) → self::Class1
   return self::Class1|named3(it);
-static method Class1|named4(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named4(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named4#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named4(additional, it);
-static method Class1|named5(core::int additional, core::int it) → self::Class1 {
+static inline-class-member method Class1|named5(core::int additional, core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
+static inline-class-member method Class1|_#named5#tearOff(core::int additional, core::int it) → self::Class1
   return self::Class1|named5(additional, it);
-static method Class1|named6(core::String text) → self::Class1 {
+static inline-class-member method Class1|named6(core::String text) → self::Class1 {
   lowered final self::Class1 #this = text.{core::String::length}{core::int};
   return #this;
 }
-static method Class1|_#named6#tearOff(core::String text) → self::Class1
+static inline-class-member method Class1|_#named6#tearOff(core::String text) → self::Class1
   return self::Class1|named6(text);
-static method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
+static inline-class-member method Class2|<T extends core::Object? = dynamic>(self::Class2|::T% it) → self::Class2<self::Class2|::T%> {
   lowered final self::Class2<self::Class2|::T%> #this = it;
   return #this;
 }
-static method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
+static inline-class-member method Class2|_#new#tearOff<T extends core::Object? = dynamic>(self::Class2|_#new#tearOff::T% it) → self::Class2<self::Class2|_#new#tearOff::T%>
   return self::Class2|<self::Class2|_#new#tearOff::T%>(it);
-static method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
+static inline-class-member method Class2|named1<T extends core::Object? = dynamic>(self::Class2|named1::T% it, core::int additional) → self::Class2<self::Class2|named1::T%> {
   lowered final self::Class2<self::Class2|named1::T%> #this = it;
   return #this;
 }
-static method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
+static inline-class-member method Class2|_#named1#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named1#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named1#tearOff::T%>
   return self::Class2|named1<self::Class2|_#named1#tearOff::T%>(it, additional);
-static method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
+static inline-class-member method Class2|named2<T extends core::Object? = dynamic>(self::Class2|named2::T% it, core::int additional) → self::Class2<self::Class2|named2::T%> {
   lowered final self::Class2<self::Class2|named2::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
+static inline-class-member method Class2|_#named2#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named2#tearOff::T% it, core::int additional) → self::Class2<self::Class2|_#named2#tearOff::T%>
   return self::Class2|named2<self::Class2|_#named2#tearOff::T%>(it, additional);
-static method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
+static inline-class-member method Class2|named3<T extends core::Object? = dynamic>(self::Class2|named3::T% it) → self::Class2<self::Class2|named3::T%> {
   lowered final self::Class2<self::Class2|named3::T%> #this = it;
   return #this;
 }
-static method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
+static inline-class-member method Class2|_#named3#tearOff<T extends core::Object? = dynamic>(self::Class2|_#named3#tearOff::T% it) → self::Class2<self::Class2|_#named3#tearOff::T%>
   return self::Class2|named3<self::Class2|_#named3#tearOff::T%>(it);
-static method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
+static inline-class-member method Class2|named4<T extends core::Object? = dynamic>(core::int additional, self::Class2|named4::T% it) → self::Class2<self::Class2|named4::T%> {
   lowered final self::Class2<self::Class2|named4::T%> #this = it;
   return #this;
 }
-static method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
+static inline-class-member method Class2|_#named4#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named4#tearOff::T% it) → self::Class2<self::Class2|_#named4#tearOff::T%>
   return self::Class2|named4<self::Class2|_#named4#tearOff::T%>(additional, it);
-static method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
+static inline-class-member method Class2|named5<T extends core::Object? = dynamic>(core::int additional, self::Class2|named5::T% it) → self::Class2<self::Class2|named5::T%> {
   lowered final self::Class2<self::Class2|named5::T%> #this = it;
   {
     core::print(additional);
   }
   return #this;
 }
-static method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
+static inline-class-member method Class2|_#named5#tearOff<T extends core::Object? = dynamic>(core::int additional, self::Class2|_#named5#tearOff::T% it) → self::Class2<self::Class2|_#named5#tearOff::T%>
   return self::Class2|named5<self::Class2|_#named5#tearOff::T%>(additional, it);
-static method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
+static inline-class-member method Class2|named6<T extends core::Object? = dynamic>(core::List<self::Class2|named6::T%> list) → self::Class2<self::Class2|named6::T%> {
   lowered final self::Class2<self::Class2|named6::T%> #this = list.{core::Iterable::first}{self::Class2|named6::T%};
   return #this;
 }
-static method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
+static inline-class-member method Class2|_#named6#tearOff<T extends core::Object? = dynamic>(core::List<self::Class2|_#named6#tearOff::T%> list) → self::Class2<self::Class2|_#named6#tearOff::T%>
   return self::Class2|named6<self::Class2|_#named6#tearOff::T%>(list);
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
index 503932ac461..264796f5ff7 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.expect
@@ -14,23 +14,23 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = #C1]) → self::I {
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
   lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
   lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
index 503932ac461..264796f5ff7 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.strong.transformed.expect
@@ -14,23 +14,23 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = #C1]) → self::I {
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
   lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
   lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
index 503932ac461..264796f5ff7 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.expect
@@ -14,23 +14,23 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = #C1]) → self::I {
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
   lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
   lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
index 503932ac461..264796f5ff7 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.modular.expect
@@ -14,23 +14,23 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = #C1]) → self::I {
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
   lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
   lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
index b49fd7e412a..3e6c18b8a4d 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.outline.expect
@@ -14,21 +14,21 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = null]) → self::I
+static inline-class-member method I|(core::int x, [core::int? y = null]) → self::I
   ;
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = null}) → self::I2
+static inline-class-member method I2|(core::int x, {core::int? y = null}) → self::I2
   ;
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
index 503932ac461..264796f5ff7 100644
--- a/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructor_formal_parameters.dart.weak.transformed.expect
@@ -14,23 +14,23 @@ inline class I2 /* declaredRepresentationType = core::int */ {
   constructor • = self::I2|;
   tearoff • = self::I2|_#new#tearOff;
 }
-static method I|(core::int x, [core::int? y = #C1]) → self::I {
+static inline-class-member method I|(core::int x, [core::int? y = #C1]) → self::I {
   lowered final self::I #this = x.{core::num::+}(let final core::int? #t1 = y in #t1 == null ?{core::int} 42 : #t1{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
+static inline-class-member method I|_#new#tearOff(core::int x, [core::int? y]) → self::I
   return self::I|(x, y);
-static method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
-static method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
+static inline-class-member method I|m(lowered final self::I #this, core::String s, [core::int i = #C2]) → void {}
+static inline-class-member method I|get#m(lowered final self::I #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C2]) → void => self::I|m(#this, s, i);
-static method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
+static inline-class-member method I2|(core::int x, {core::int? y = #C1}) → self::I2 {
   lowered final self::I2 #this = x.{core::num::+}(let final core::int? #t2 = y in #t2 == null ?{core::int} 87 : #t2{core::int}){(core::num) → core::int};
   return #this;
 }
-static method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
+static inline-class-member method I2|_#new#tearOff(core::int x, {core::int? y}) → self::I2
   return self::I2|(x, y: y);
-static method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
-static method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
+static inline-class-member method I2|m(lowered final self::I2 #this, core::String s, {core::int i = #C2}) → void {}
+static inline-class-member method I2|get#m(lowered final self::I2 #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C2}) → void => self::I2|m(#this, s, i: i);
 static method main() → dynamic {
   self::expect(42, self::I|(0));
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect b/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
index 3c6c5202b5d..c362463bed0 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.strong.expect
@@ -10,15 +10,15 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
index 3c6c5202b5d..c362463bed0 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.strong.transformed.expect
@@ -10,15 +10,15 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
index 3c6c5202b5d..c362463bed0 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.expect
@@ -10,15 +10,15 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
index 3c6c5202b5d..c362463bed0 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.modular.expect
@@ -10,15 +10,15 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
index c62ae261f9f..2a9c52ec6f6 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.outline.expect
@@ -10,11 +10,11 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1
+static inline-class-member method Class1|(core::int field) → self::Class1
   ;
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2
+static inline-class-member method Class2|(core::int field) → self::Class2
   ;
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
index 3c6c5202b5d..c362463bed0 100644
--- a/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/constructors.dart.weak.transformed.expect
@@ -10,15 +10,15 @@ inline class Class2 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class2|;
   tearoff • = self::Class2|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.strong.expect b/pkg/front_end/testcases/inline_class/external.dart.strong.expect
index 1a1c9fbc33c..e343170f7be 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.strong.expect
@@ -27,28 +27,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
index 1a1c9fbc33c..e343170f7be 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.strong.transformed.expect
@@ -27,28 +27,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.expect
index 4a83c163e31..44d77e923a6 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.expect
@@ -27,28 +27,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
index 4a83c163e31..44d77e923a6 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.modular.expect
@@ -27,28 +27,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
index 12fa8ec3a09..d13b8451395 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.outline.expect
@@ -26,27 +26,27 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
index 4a83c163e31..44d77e923a6 100644
--- a/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/external.dart.weak.transformed.expect
@@ -27,28 +27,28 @@ inline class B /* declaredRepresentationType = self::A */ {
   constructor named = self::B|named;
   tearoff named = self::B|_#named#tearOff;
 }
-external static method B|(self::A a) → self::B;
-static method B|_#new#tearOff(self::A a) → self::B
+external static inline-class-member method B|(self::A a) → self::B;
+static inline-class-member method B|_#new#tearOff(self::A a) → self::B
   return self::B|(a);
-external static method B|named(core::int i) → self::B;
-static method B|_#named#tearOff(core::int i) → self::B
+external static inline-class-member method B|named(core::int i) → self::B;
+static inline-class-member method B|_#named#tearOff(core::int i) → self::B
   return self::B|named(i);
-external static method B|get#field(lowered self::A #this) → self::A;
-external static method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
-external static method B|method(lowered final self::B #this) → self::A;
-static method B|get#method(lowered final self::B #this) → () → self::A
+external static inline-class-member method B|get#field(lowered self::A #this) → self::A;
+external static inline-class-member method B|set#field(lowered self::A #this, self::A #externalFieldValue) → void;
+external static inline-class-member method B|method(lowered final self::B #this) → self::A;
+static inline-class-member method B|get#method(lowered final self::B #this) → () → self::A
   return () → self::A => self::B|method(#this);
-external static method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
-static method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
+external static inline-class-member method B|genericMethod<T extends core::Object? = dynamic>(lowered final self::B #this, self::B|genericMethod::T% t) → self::B|genericMethod::T%;
+static inline-class-member method B|get#genericMethod(lowered final self::B #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::B|genericMethod<T%>(#this, t);
-external static method B|get#getter(lowered final self::B #this) → self::B;
-external static method B|set#setter(lowered final self::B #this, self::B b) → void;
-external static get B|staticField() → self::A;
-external static set B|staticField(self::A #externalFieldValue) → void;
-external static method B|staticMethod() → self::A;
-external static method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
-external static get B|staticGetter() → self::B;
-external static set B|staticSetter(self::B b) → void;
+external static inline-class-member method B|get#getter(lowered final self::B #this) → self::B;
+external static inline-class-member method B|set#setter(lowered final self::B #this, self::B b) → void;
+external static inline-class-member get B|staticField() → self::A;
+external static inline-class-member set B|staticField(self::A #externalFieldValue) → void;
+external static inline-class-member method B|staticMethod() → self::A;
+external static inline-class-member method B|staticGenericMethod<T extends core::Object? = dynamic>(self::B|staticGenericMethod::T% t) → self::B|staticGenericMethod::T%;
+external static inline-class-member get B|staticGetter() → self::B;
+external static inline-class-member set B|staticSetter(self::B b) → void;
 static method method(self::A a) → void {
   self::B b1 = self::B|(a);
   self::B b2 = self::B|named(0);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
index 408f3626ebe..8e5e60cc871 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.strong.expect
@@ -336,14 +336,14 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
   lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
   return #this;
 }
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
   lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
   return #this;
 }
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
   lowered final self::GenericFunctionInlineClass #this = it;
   return #this;
 }
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
   lowered final self::DynamicInlineClass #this = it;
   return #this;
 }
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
   lowered final self::ErroneousInlineClass #this = b;
   return #this;
 }
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,7 +575,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
@@ -694,13 +694,13 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
   lowered final self2::PrivateInlineClass #this = _it;
   return #this;
 }
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
index 408f3626ebe..8e5e60cc871 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.strong.transformed.expect
@@ -336,14 +336,14 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
   lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
   return #this;
 }
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
   lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
   return #this;
 }
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
   lowered final self::GenericFunctionInlineClass #this = it;
   return #this;
 }
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
   lowered final self::DynamicInlineClass #this = it;
   return #this;
 }
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
   lowered final self::ErroneousInlineClass #this = b;
   return #this;
 }
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,7 +575,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
@@ -694,13 +694,13 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
   lowered final self2::PrivateInlineClass #this = _it;
   return #this;
 }
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
index 408f3626ebe..8e5e60cc871 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.expect
@@ -336,14 +336,14 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
   lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
   return #this;
 }
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
   lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
   return #this;
 }
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
   lowered final self::GenericFunctionInlineClass #this = it;
   return #this;
 }
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
   lowered final self::DynamicInlineClass #this = it;
   return #this;
 }
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
   lowered final self::ErroneousInlineClass #this = b;
   return #this;
 }
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,7 +575,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
@@ -694,13 +694,13 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
   lowered final self2::PrivateInlineClass #this = _it;
   return #this;
 }
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
index 408f3626ebe..8e5e60cc871 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.modular.expect
@@ -336,14 +336,14 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
   lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
   return #this;
 }
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
   lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
   return #this;
 }
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
   lowered final self::GenericFunctionInlineClass #this = it;
   return #this;
 }
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
   lowered final self::DynamicInlineClass #this = it;
   return #this;
 }
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
   lowered final self::ErroneousInlineClass #this = b;
   return #this;
 }
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,7 +575,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
@@ -694,13 +694,13 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
   lowered final self2::PrivateInlineClass #this = _it;
   return #this;
 }
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
index 3b4a3c84f49..1f82d667693 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.outline.expect
@@ -43,55 +43,55 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void
   ;
-static method InlineClass|(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass
   ;
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void
   ;
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%>
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%>
   ;
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void
   ;
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%>
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%>
   ;
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void
   ;
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   ;
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void
   ;
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass
   ;
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void
   ;
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass
   ;
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void
   ;
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void
   ;
@@ -106,11 +106,11 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass
   ;
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void
   ;
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
index 408f3626ebe..8e5e60cc871 100644
--- a/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/field_access.dart.weak.transformed.expect
@@ -336,14 +336,14 @@ inline class ErroneousInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::ErroneousInlineClass|;
   tearoff • = self::ErroneousInlineClass|_#new#tearOff;
 }
-static method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#it(lowered final dynamic #this, dynamic value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → void {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:19:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -363,15 +363,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = 42; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = 42;
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → void
   return () → void => self::InlineClass|test(#this);
-static method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
+static inline-class-member method GenericInlineClass|<T extends core::Object? = dynamic>(self::GenericInlineClass|::T% it) → self::GenericInlineClass<self::GenericInlineClass|::T%> {
   lowered final self::GenericInlineClass<self::GenericInlineClass|::T%> #this = it;
   return #this;
 }
-static method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
+static inline-class-member method GenericInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(self::GenericInlineClass|_#new#tearOff::T% it) → self::GenericInlineClass<self::GenericInlineClass|_#new#tearOff::T%>
   return self::GenericInlineClass|<self::GenericInlineClass|_#new#tearOff::T%>(it);
-static method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
+static inline-class-member method GenericInlineClass|test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|test::T%> #this, self::GenericInlineClass|test::T% t) → void {
   self::GenericInlineClass|test::T% a1 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   self::GenericInlineClass|test::T% a2 = #this as{Unchecked} self::GenericInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:34:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T'.
@@ -391,15 +391,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = it = t; // Error, should not resolve to extension method.
              ^^" in #this{<unresolved>}.it = t;
 }
-static method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
+static inline-class-member method GenericInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::GenericInlineClass<self::GenericInlineClass|get#test::T%> #this) → (self::GenericInlineClass|get#test::T%) → void
   return (self::GenericInlineClass|get#test::T% t) → void => self::GenericInlineClass|test<self::GenericInlineClass|get#test::T%>(#this, t);
-static method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
+static inline-class-member method FunctionInlineClass|<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|::T%> {
   lowered final self::FunctionInlineClass<self::FunctionInlineClass|::T%> #this = it;
   return #this;
 }
-static method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
+static inline-class-member method FunctionInlineClass|_#new#tearOff<T extends core::Object? = dynamic>(() → self::FunctionInlineClass|_#new#tearOff::T% it) → self::FunctionInlineClass<self::FunctionInlineClass|_#new#tearOff::T%>
   return self::FunctionInlineClass|<self::FunctionInlineClass|_#new#tearOff::T%>(it);
-static method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
+static inline-class-member method FunctionInlineClass|test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|test::T%> #this, () → self::FunctionInlineClass|test::T% t) → void {
   () → self::FunctionInlineClass|test::T% a1 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   () → self::FunctionInlineClass|test::T% a2 = #this as{Unchecked} () → self::FunctionInlineClass|test::T%;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:49:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'T Function()'.
@@ -423,15 +423,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   self::FunctionInlineClass|test::T% d3 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
   self::FunctionInlineClass|test::T% d4 = (#this as{Unchecked} () → self::FunctionInlineClass|test::T%)(){() → self::FunctionInlineClass|test::T%};
 }
-static method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
+static inline-class-member method FunctionInlineClass|get#test<T extends core::Object? = dynamic>(lowered final self::FunctionInlineClass<self::FunctionInlineClass|get#test::T%> #this) → (() → self::FunctionInlineClass|get#test::T%) → void
   return (() → self::FunctionInlineClass|get#test::T% t) → void => self::FunctionInlineClass|test<self::FunctionInlineClass|get#test::T%>(#this, t);
-static method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
+static inline-class-member method GenericFunctionInlineClass|(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass {
   lowered final self::GenericFunctionInlineClass #this = it;
   return #this;
 }
-static method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
+static inline-class-member method GenericFunctionInlineClass|_#new#tearOff(<T extends core::Object? = dynamic>() → T% it) → self::GenericFunctionInlineClass
   return self::GenericFunctionInlineClass|(it);
-static method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
+static inline-class-member method GenericFunctionInlineClass|test(lowered final self::GenericFunctionInlineClass #this) → void {
   <T extends core::Object? = dynamic>() → T% a1 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   <T extends core::Object? = dynamic>() → T% a2 = #this as{Unchecked} <T extends core::Object? = dynamic>() → T%;
   () → core::int a3 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>;
@@ -459,15 +459,15 @@ Try correcting the name to the name of an existing getter, or defining a getter
   core::int e1 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
   core::int e2 = (#this as{Unchecked} <T extends core::Object? = dynamic>() → T%)<core::int>(){() → core::int};
 }
-static method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
+static inline-class-member method GenericFunctionInlineClass|get#test(lowered final self::GenericFunctionInlineClass #this) → () → void
   return () → void => self::GenericFunctionInlineClass|test(#this);
-static method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
+static inline-class-member method DynamicInlineClass|(dynamic it) → self::DynamicInlineClass {
   lowered final self::DynamicInlineClass #this = it;
   return #this;
 }
-static method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
+static inline-class-member method DynamicInlineClass|_#new#tearOff(dynamic it) → self::DynamicInlineClass
   return self::DynamicInlineClass|(it);
-static method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
+static inline-class-member method DynamicInlineClass|test(lowered final self::DynamicInlineClass #this) → void {
   dynamic a1 = #this as{Unchecked} dynamic;
   dynamic a2 = #this as{Unchecked} dynamic;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:92:21: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
@@ -491,15 +491,15 @@ Try correcting the name to the name of an existing setter, or defining a setter
   dynamic d3 = (#this as{Unchecked} dynamic){dynamic}.call();
   dynamic d4 = (#this as{Unchecked} dynamic){dynamic}.call();
 }
-static method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
+static inline-class-member method DynamicInlineClass|get#test(lowered final self::DynamicInlineClass #this) → () → void
   return () → void => self::DynamicInlineClass|test(#this);
-static method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
+static inline-class-member method ErroneousInlineClass|(core::int a, core::String b) → self::ErroneousInlineClass {
   lowered final self::ErroneousInlineClass #this = b;
   return #this;
 }
-static method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
+static inline-class-member method ErroneousInlineClass|_#new#tearOff(core::int a, core::String b) → self::ErroneousInlineClass
   return self::ErroneousInlineClass|(a, b);
-static method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
+static inline-class-member method ErroneousInlineClass|test(lowered final self::ErroneousInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   dynamic a3 = invalid-expression "pkg/front_end/testcases/inline_class/field_access.dart:112:19: Error: The getter 'b' isn't defined for the class 'ErroneousInlineClass'.
@@ -575,7 +575,7 @@ Try correcting the name to the name of an existing getter, or defining a getter
     var e4 = b.call(); // Error
              ^" in #this{<unresolved>}.b{dynamic}.call();
 }
-static method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
+static inline-class-member method ErroneousInlineClass|get#test(lowered final self::ErroneousInlineClass #this) → () → void
   return () → void => self::ErroneousInlineClass|test(#this);
 static method test(self::InlineClass inlineClass, self::GenericInlineClass<core::String> genericInlineClass, self::FunctionInlineClass<core::String> functionInlineClass, self::GenericFunctionInlineClass genericFunctionInlineClass, self::DynamicInlineClass dynamicInlineClass, self::ErroneousInlineClass erroneousInlineClass, #lib1::PrivateInlineClass privateInlineClass) → void {
   core::int a1 = inlineClass as{Unchecked} core::int;
@@ -694,13 +694,13 @@ inline class PrivateInlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self2::PrivateInlineClass|;
   tearoff • = self2::PrivateInlineClass|_#new#tearOff;
 }
-static method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
+static inline-class-member method PrivateInlineClass|(core::int _it) → self2::PrivateInlineClass {
   lowered final self2::PrivateInlineClass #this = _it;
   return #this;
 }
-static method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
+static inline-class-member method PrivateInlineClass|_#new#tearOff(core::int _it) → self2::PrivateInlineClass
   return self2::PrivateInlineClass|(_it);
-static method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
+static inline-class-member method PrivateInlineClass|test(lowered final self2::PrivateInlineClass #this) → void {
   core::int a1 = #this as{Unchecked} core::int;
   core::int a2 = #this as{Unchecked} core::int;
   invalid-type b1 = invalid-expression "pkg/front_end/testcases/inline_class/field_access_lib.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'int'.
@@ -720,5 +720,5 @@ Try correcting the name to the name of an existing setter, or defining a setter
     var c2 = _it = 42; // Error, should not resolve to extension method.
              ^^^" in #this{<unresolved>}._it = 42;
 }
-static method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
+static inline-class-member method PrivateInlineClass|get#test(lowered final self2::PrivateInlineClass #this) → () → void
   return () → void => self2::PrivateInlineClass|test(#this);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect b/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
index a2fb0949d0c..9a07787235a 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.strong.expect
@@ -16,9 +16,9 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
   lowered final has::C #this = i;
   return #this;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
index a2fb0949d0c..9a07787235a 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.strong.transformed.expect
@@ -16,9 +16,9 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
   lowered final has::C #this = i;
   return #this;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
index a2fb0949d0c..9a07787235a 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.expect
@@ -16,9 +16,9 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
   lowered final has::C #this = i;
   return #this;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
index a2fb0949d0c..9a07787235a 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.modular.expect
@@ -16,9 +16,9 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
   lowered final has::C #this = i;
   return #this;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
index b0cc62ce40a..fc1249537a5 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.outline.expect
@@ -17,7 +17,7 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C
   ;
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
index a2fb0949d0c..9a07787235a 100644
--- a/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/has_export.dart.weak.transformed.expect
@@ -16,9 +16,9 @@ inline class C /* declaredRepresentationType = core::int */ { // from org-dartla
   constructor • = has::C|;
   tearoff • = has::_#new#tearOff;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ C|(core::int i) → has::C {
   lowered final has::C #this = i;
   return #this;
 }
-static method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
+static inline-class-member method /* from org-dartlang-testcase:///has_part_of_lib.dart */ _#new#tearOff(core::int i) → has::C
   return has::C|(i);
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.strong.expect b/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
index 1acb38b5e70..08bb617a1cc 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.strong.expect
@@ -230,55 +230,55 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A {
+static inline-class-member method A|(core::int it) → self::A {
   lowered final self::A #this = it;
   return #this;
 }
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
   lowered final self::B<self::B|::T%> #this = it;
   return #this;
 }
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1 {
+static inline-class-member method C1|(core::int it) → self::C1 {
   lowered final self::C1 #this = it;
   return #this;
 }
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2 {
+static inline-class-member method C2|(core::int it) → self::C2 {
   lowered final self::C2 #this = it;
   return #this;
 }
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1 {
+static inline-class-member method D1|(core::int it) → self::D1 {
   lowered final self::D1 #this = it;
   return #this;
 }
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
index 8b2a64f304b..c9786c06203 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.strong.transformed.expect
@@ -230,55 +230,55 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A {
+static inline-class-member method A|(core::int it) → self::A {
   lowered final self::A #this = it;
   return #this;
 }
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
   lowered final self::B<self::B|::T%> #this = it;
   return #this;
 }
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1 {
+static inline-class-member method C1|(core::int it) → self::C1 {
   lowered final self::C1 #this = it;
   return #this;
 }
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2 {
+static inline-class-member method C2|(core::int it) → self::C2 {
   lowered final self::C2 #this = it;
   return #this;
 }
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1 {
+static inline-class-member method D1|(core::int it) → self::D1 {
   lowered final self::D1 #this = it;
   return #this;
 }
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
index 1acb38b5e70..08bb617a1cc 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.expect
@@ -230,55 +230,55 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A {
+static inline-class-member method A|(core::int it) → self::A {
   lowered final self::A #this = it;
   return #this;
 }
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
   lowered final self::B<self::B|::T%> #this = it;
   return #this;
 }
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1 {
+static inline-class-member method C1|(core::int it) → self::C1 {
   lowered final self::C1 #this = it;
   return #this;
 }
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2 {
+static inline-class-member method C2|(core::int it) → self::C2 {
   lowered final self::C2 #this = it;
   return #this;
 }
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1 {
+static inline-class-member method D1|(core::int it) → self::D1 {
   lowered final self::D1 #this = it;
   return #this;
 }
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
index 1acb38b5e70..08bb617a1cc 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.modular.expect
@@ -230,55 +230,55 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A {
+static inline-class-member method A|(core::int it) → self::A {
   lowered final self::A #this = it;
   return #this;
 }
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
   lowered final self::B<self::B|::T%> #this = it;
   return #this;
 }
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1 {
+static inline-class-member method C1|(core::int it) → self::C1 {
   lowered final self::C1 #this = it;
   return #this;
 }
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2 {
+static inline-class-member method C2|(core::int it) → self::C2 {
   lowered final self::C2 #this = it;
   return #this;
 }
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1 {
+static inline-class-member method D1|(core::int it) → self::D1 {
   lowered final self::D1 #this = it;
   return #this;
 }
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
index ee28441acae..85fcc6a8461 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.outline.expect
@@ -32,45 +32,45 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A
+static inline-class-member method A|(core::int it) → self::A
   ;
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   ;
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%>
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%>
   ;
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   ;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1
+static inline-class-member method C1|(core::int it) → self::C1
   ;
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   ;
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2
+static inline-class-member method C2|(core::int it) → self::C2
   ;
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   ;
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1
+static inline-class-member method D1|(core::int it) → self::D1
   ;
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   ;
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
index 8b2a64f304b..c9786c06203 100644
--- a/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/implements.dart.weak.transformed.expect
@@ -230,55 +230,55 @@ inline class D1 /* declaredRepresentationType = core::int */ implements self::C1
   constructor • = self::D1|;
   tearoff • = self::D1|_#new#tearOff;
 }
-static method A|(core::int it) → self::A {
+static inline-class-member method A|(core::int it) → self::A {
   lowered final self::A #this = it;
   return #this;
 }
-static method A|_#new#tearOff(core::int it) → self::A
+static inline-class-member method A|_#new#tearOff(core::int it) → self::A
   return self::A|(it);
-static method A|methodA(lowered final self::A #this) → core::int
+static inline-class-member method A|methodA(lowered final self::A #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(5){(core::num) → core::int};
-static method A|get#methodA(lowered final self::A #this) → () → core::int
+static inline-class-member method A|get#methodA(lowered final self::A #this) → () → core::int
   return () → core::int => self::A|methodA(#this);
-static method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
+static inline-class-member method B|<T extends core::Object? = dynamic>(self::B|::T% it) → self::B<self::B|::T%> {
   lowered final self::B<self::B|::T%> #this = it;
   return #this;
 }
-static method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
+static inline-class-member method B|_#new#tearOff<T extends core::Object? = dynamic>(self::B|_#new#tearOff::T% it) → self::B<self::B|_#new#tearOff::T%>
   return self::B|<self::B|_#new#tearOff::T%>(it);
-static method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
+static inline-class-member method B|methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|methodB::T%> #this) → self::B|methodB::T%
   return #this as{Unchecked} self::B|methodB::T%;
-static method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
+static inline-class-member method B|get#methodB<T extends core::Object? = dynamic>(lowered final self::B<self::B|get#methodB::T%> #this) → () → self::B|get#methodB::T%
   return () → self::B|get#methodB::T% => self::B|methodB<self::B|get#methodB::T%>(#this);
-static method C1|(core::int it) → self::C1 {
+static inline-class-member method C1|(core::int it) → self::C1 {
   lowered final self::C1 #this = it;
   return #this;
 }
-static method C1|_#new#tearOff(core::int it) → self::C1
+static inline-class-member method C1|_#new#tearOff(core::int it) → self::C1
   return self::C1|(it);
-static method C1|methodC1(lowered final self::C1 #this) → core::int
+static inline-class-member method C1|methodC1(lowered final self::C1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(42){(core::num) → core::int};
-static method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
+static inline-class-member method C1|get#methodC1(lowered final self::C1 #this) → () → core::int
   return () → core::int => self::C1|methodC1(#this);
-static method C2|(core::int it) → self::C2 {
+static inline-class-member method C2|(core::int it) → self::C2 {
   lowered final self::C2 #this = it;
   return #this;
 }
-static method C2|_#new#tearOff(core::int it) → self::C2
+static inline-class-member method C2|_#new#tearOff(core::int it) → self::C2
   return self::C2|(it);
-static method C2|methodC2(lowered final self::C2 #this) → core::int
+static inline-class-member method C2|methodC2(lowered final self::C2 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(87){(core::num) → core::int};
-static method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
+static inline-class-member method C2|get#methodC2(lowered final self::C2 #this) → () → core::int
   return () → core::int => self::C2|methodC2(#this);
-static method D1|(core::int it) → self::D1 {
+static inline-class-member method D1|(core::int it) → self::D1 {
   lowered final self::D1 #this = it;
   return #this;
 }
-static method D1|_#new#tearOff(core::int it) → self::D1
+static inline-class-member method D1|_#new#tearOff(core::int it) → self::D1
   return self::D1|(it);
-static method D1|methodD1(lowered final self::D1 #this) → core::int
+static inline-class-member method D1|methodD1(lowered final self::D1 #this) → core::int
   return (#this as{Unchecked} core::int).{core::num::+}(123){(core::num) → core::int};
-static method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
+static inline-class-member method D1|get#methodD1(lowered final self::D1 #this) → () → core::int
   return () → core::int => self::D1|methodD1(#this);
 static method errors(self::A a, self::B<core::String> b1, self::B<core::num> b2, self::C1 c1, self::C2 c2, self::D1 d1) → dynamic {
   invalid-expression "pkg/front_end/testcases/inline_class/implements.dart:46:5: Error: The method 'methodB' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect b/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
index f6fe522b60b..a2b8407da33 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.strong.expect
@@ -44,42 +44,42 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
   lowered final self::Class4 #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5 {
+static inline-class-member method Class5|(core::int field) → self::Class5 {
   lowered final self::Class5 #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6 {
+static inline-class-member method Class6|(core::int field) → self::Class6 {
   lowered final self::Class6 #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
index f6fe522b60b..a2b8407da33 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.strong.transformed.expect
@@ -44,42 +44,42 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
   lowered final self::Class4 #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5 {
+static inline-class-member method Class5|(core::int field) → self::Class5 {
   lowered final self::Class5 #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6 {
+static inline-class-member method Class6|(core::int field) → self::Class6 {
   lowered final self::Class6 #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
index f6fe522b60b..a2b8407da33 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.expect
@@ -44,42 +44,42 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
   lowered final self::Class4 #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5 {
+static inline-class-member method Class5|(core::int field) → self::Class5 {
   lowered final self::Class5 #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6 {
+static inline-class-member method Class6|(core::int field) → self::Class6 {
   lowered final self::Class6 #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
index f6fe522b60b..a2b8407da33 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.modular.expect
@@ -44,42 +44,42 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
   lowered final self::Class4 #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5 {
+static inline-class-member method Class5|(core::int field) → self::Class5 {
   lowered final self::Class5 #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6 {
+static inline-class-member method Class6|(core::int field) → self::Class6 {
   lowered final self::Class6 #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
index 71fc2c3a003..84ce001978a 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.outline.expect
@@ -24,23 +24,23 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1
+static inline-class-member method Class1|(core::int field) → self::Class1
   ;
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2
+static inline-class-member method Class2|(core::int field) → self::Class2
   ;
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4
   ;
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5
+static inline-class-member method Class5|(core::int field) → self::Class5
   ;
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6
+static inline-class-member method Class6|(core::int field) → self::Class6
   ;
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
index f6fe522b60b..a2b8407da33 100644
--- a/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/initializers.dart.weak.transformed.expect
@@ -44,42 +44,42 @@ inline class Class6 /* declaredRepresentationType = core::int */ {
   constructor • = self::Class6|;
   tearoff • = self::Class6|_#new#tearOff;
 }
-static method Class1|(core::int field) → self::Class1 {
+static inline-class-member method Class1|(core::int field) → self::Class1 {
   lowered final self::Class1 #this = field;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int field) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int field) → self::Class1
   return self::Class1|(field);
-static method Class2|(core::int field) → self::Class2 {
+static inline-class-member method Class2|(core::int field) → self::Class2 {
   lowered final self::Class2 #this = field;
   return #this;
 }
-static method Class2|_#new#tearOff(core::int field) → self::Class2
+static inline-class-member method Class2|_#new#tearOff(core::int field) → self::Class2
   return self::Class2|(field);
-static method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
+static inline-class-member method Class4|(core::int field, dynamic nonexisting) → self::Class4 {
   lowered final self::Class4 #this = field;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:24:27: Error: 'nonexisting' isn't an instance field of this class.
   Class4(this.field, this.nonexisting);
                           ^^^^^^^^^^^";
   return #this;
 }
-static method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
+static inline-class-member method Class4|_#new#tearOff(core::int field, dynamic nonexisting) → self::Class4
   return self::Class4|(field, nonexisting);
-static method Class5|(core::int field) → self::Class5 {
+static inline-class-member method Class5|(core::int field) → self::Class5 {
   lowered final self::Class5 #this = field;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:30:35: Error: 'field' was already initialized by this constructor.
   Class5(this.field) : this.field = 42;
                                   ^";
   return #this;
 }
-static method Class5|_#new#tearOff(core::int field) → self::Class5
+static inline-class-member method Class5|_#new#tearOff(core::int field) → self::Class5
   return self::Class5|(field);
-static method Class6|(core::int field) → self::Class6 {
+static inline-class-member method Class6|(core::int field) → self::Class6 {
   lowered final self::Class6 #this = field;
   final dynamic #t3 = invalid-expression "pkg/front_end/testcases/inline_class/initializers.dart:36:29: Error: 'nonexisting' isn't an instance field of this class.
   Class6(this.field) : this.nonexisting = 42;
                             ^^^^^^^^^^^";
   return #this;
 }
-static method Class6|_#new#tearOff(core::int field) → self::Class6
+static inline-class-member method Class6|_#new#tearOff(core::int field) → self::Class6
   return self::Class6|(field);
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
index 3b9a4d4882e..b758388348b 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.expect
@@ -17,16 +17,16 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
   lowered final self::Class3<self::Class3|::T%> #this = it;
   return #this;
 }
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
index 4da3400b944..3767f34ddf8 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.strong.transformed.expect
@@ -17,16 +17,16 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
   lowered final self::Class3<self::Class3|::T%> #this = it;
   return #this;
 }
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
index 3b9a4d4882e..b758388348b 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.expect
@@ -17,16 +17,16 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
   lowered final self::Class3<self::Class3|::T%> #this = it;
   return #this;
 }
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
index 3b9a4d4882e..b758388348b 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.modular.expect
@@ -17,16 +17,16 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
   lowered final self::Class3<self::Class3|::T%> #this = it;
   return #this;
 }
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
index 858d68e683f..73fc751b845 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.outline.expect
@@ -17,13 +17,13 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1
+static inline-class-member method Class1|(core::int it) → self::Class1
   ;
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%>
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%>
   ;
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
index 4da3400b944..3767f34ddf8 100644
--- a/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/inline_class_declaration.dart.weak.transformed.expect
@@ -17,16 +17,16 @@ inline class Class3<T extends core::Object? = dynamic> /* declaredRepresentation
   constructor • = self::Class3|;
   tearoff • = self::Class3|_#new#tearOff;
 }
-static method Class1|(core::int it) → self::Class1 {
+static inline-class-member method Class1|(core::int it) → self::Class1 {
   lowered final self::Class1 #this = it;
   return #this;
 }
-static method Class1|_#new#tearOff(core::int it) → self::Class1
+static inline-class-member method Class1|_#new#tearOff(core::int it) → self::Class1
   return self::Class1|(it);
-static method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
+static inline-class-member method Class3|<T extends core::Object? = dynamic>(core::List<self::Class3|::T%> it) → self::Class3<self::Class3|::T%> {
   lowered final self::Class3<self::Class3|::T%> #this = it;
   return #this;
 }
-static method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
+static inline-class-member method Class3|_#new#tearOff<T extends core::Object? = dynamic>(core::List<self::Class3|_#new#tearOff::T%> it) → self::Class3<self::Class3|_#new#tearOff::T%>
   return self::Class3|<self::Class3|_#new#tearOff::T%>(it);
 static method method(self::Class1 c1, self::Class3<core::int> c3) → dynamic {}
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
index 19ccfb4ac2e..ec08a7dcacd 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.expect
@@ -6,11 +6,11 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
   lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
   return #this;
 }
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void {}
 static method main() → void {
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
index 19ccfb4ac2e..ec08a7dcacd 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.strong.transformed.expect
@@ -6,11 +6,11 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
   lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
   return #this;
 }
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void {}
 static method main() → void {
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
index 19ccfb4ac2e..ec08a7dcacd 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.expect
@@ -6,11 +6,11 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
   lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
   return #this;
 }
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void {}
 static method main() → void {
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
index 19ccfb4ac2e..ec08a7dcacd 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.modular.expect
@@ -6,11 +6,11 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
   lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
   return #this;
 }
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void {}
 static method main() → void {
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
index 9c47f77a548..c0b2536f076 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.outline.expect
@@ -6,9 +6,9 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%>
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%>
   ;
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
index 19ccfb4ac2e..ec08a7dcacd 100644
--- a/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51146.dart.weak.transformed.expect
@@ -6,11 +6,11 @@ inline class I<X extends core::Object? = dynamic, Y extends core::Object? = dyna
   constructor • = self::I|;
   tearoff • = self::I|_#new#tearOff;
 }
-static method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
+static inline-class-member method I|<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|::X% value) → self::I<self::I|::X%, self::I|::Y%> {
   lowered final self::I<self::I|::X%, self::I|::Y%> #this = value;
   return #this;
 }
-static method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
+static inline-class-member method I|_#new#tearOff<X extends core::Object? = dynamic, Y extends core::Object? = dynamic>(self::I|_#new#tearOff::X% value) → self::I<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>
   return self::I|<self::I|_#new#tearOff::X%, self::I|_#new#tearOff::Y%>(value);
 static method f(self::I<core::int, core::String> i) → void {}
 static method main() → void {
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
index 238854ba32d..02d1bf6673e 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.strong.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.modular.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
index 0c29b66e6a1..a2c96492968 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.outline.expect
@@ -18,25 +18,25 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   ;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   ;
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J
+static inline-class-member method J|_(core::int i) → self::J
   ;
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   ;
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%>
   ;
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
index 2bc41afa9e5..3408c21c314 100644
--- a/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51285.dart.weak.transformed.expect
@@ -18,29 +18,29 @@ inline class K<T extends core::Object? = dynamic> /* declaredRepresentationType
   constructor _ = self::K|_;
   tearoff _ = self::K|_#_#tearOff;
 }
-static method I|() → self::I
+static inline-class-member method I|() → self::I
   return 0 as self::I;
-static method I|_#new#tearOff() → self::I
+static inline-class-member method I|_#new#tearOff() → self::I
   return self::I|();
-static method J|(core::int i) → self::J
+static inline-class-member method J|(core::int i) → self::J
   return self::J|_(i);
-static method J|_#new#tearOff(core::int i) → self::J
+static inline-class-member method J|_#new#tearOff(core::int i) → self::J
   return self::J|(i);
-static method J|_(core::int i) → self::J {
+static inline-class-member method J|_(core::int i) → self::J {
   lowered final self::J #this = i;
   return #this;
 }
-static method J|_#_#tearOff(core::int i) → self::J
+static inline-class-member method J|_#_#tearOff(core::int i) → self::J
   return self::J|_(i);
-static method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
+static inline-class-member method K|<T extends core::Object? = dynamic>(self::K|::T% i) → self::K<self::K|::T%>
   return self::K|_<self::K|::T%>(i);
-static method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
+static inline-class-member method K|_#new#tearOff<T extends core::Object? = dynamic>(self::K|_#new#tearOff::T% i) → self::K<self::K|_#new#tearOff::T%>
   return self::K|<self::K|_#new#tearOff::T%>(i);
-static method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
+static inline-class-member method K|_<T extends core::Object? = dynamic>(self::K|_::T% i) → self::K<self::K|_::T%> {
   lowered final self::K<self::K|_::T%> #this = i;
   return #this;
 }
-static method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
+static inline-class-member method K|_#_#tearOff<T extends core::Object? = dynamic>(self::K|_#_#tearOff::T% i) → self::K<self::K|_#_#tearOff::T%>
   return self::K|_<self::K|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(0, self::I|());
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
index f50e4e5280c..ad7b51feb12 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.expect
@@ -6,6 +6,6 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   return 0;
-static method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
index f50e4e5280c..ad7b51feb12 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.strong.transformed.expect
@@ -6,6 +6,6 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   return 0;
-static method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
index f50e4e5280c..ad7b51feb12 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.expect
@@ -6,6 +6,6 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   return 0;
-static method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
index f50e4e5280c..ad7b51feb12 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.modular.expect
@@ -6,6 +6,6 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   return 0;
-static method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
index a0e6f76aae9..01fc6b0f683 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.outline.expect
@@ -6,7 +6,7 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   ;
-static method I|set#i(lowered final self::I #this, core::int val) → void
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
index f50e4e5280c..ad7b51feb12 100644
--- a/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51299.dart.weak.transformed.expect
@@ -6,6 +6,6 @@ inline class I /* declaredRepresentationType = invalid-type */ {
   get i = self::I|get#i;
   set i = self::I|set#i;
 }
-static method I|get#i(lowered final self::I #this) → core::int
+static inline-class-member method I|get#i(lowered final self::I #this) → core::int
   return 0;
-static method I|set#i(lowered final self::I #this, core::int val) → void {}
+static inline-class-member method I|set#i(lowered final self::I #this, core::int val) → void {}
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
index 2b7d7309139..ab3c6810dde 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.expect
@@ -31,41 +31,41 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny {
+static inline-class-member method JSAny|(core::Object value) → self::JSAny {
   lowered final self::JSAny #this = value;
   return #this;
 }
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject {
+static inline-class-member method JSObject|(core::Object value) → self::JSObject {
   lowered final self::JSObject #this = value;
   return #this;
 }
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
   lowered final self::JSArray #this = value;
   return #this;
 }
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
   lowered final self::JSExportedDartObject #this = value;
   return #this;
 }
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber {
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
   lowered final self::JSNumber #this = value;
   return #this;
 }
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   return self::JSExportedDartObject|(#this);
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   return self::JSArray|(#this);
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   return self::JSNumber|(#this);
 static method main() → void {
   self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
index 626950cb96e..97af8dda62b 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.strong.transformed.expect
@@ -31,41 +31,41 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny {
+static inline-class-member method JSAny|(core::Object value) → self::JSAny {
   lowered final self::JSAny #this = value;
   return #this;
 }
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject {
+static inline-class-member method JSObject|(core::Object value) → self::JSObject {
   lowered final self::JSObject #this = value;
   return #this;
 }
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
   lowered final self::JSArray #this = value;
   return #this;
 }
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
   lowered final self::JSExportedDartObject #this = value;
   return #this;
 }
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber {
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
   lowered final self::JSNumber #this = value;
   return #this;
 }
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   return self::JSExportedDartObject|(#this);
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   return self::JSArray|(#this);
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   return self::JSNumber|(#this);
 static method main() → void {
   self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
index 2b7d7309139..ab3c6810dde 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.expect
@@ -31,41 +31,41 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny {
+static inline-class-member method JSAny|(core::Object value) → self::JSAny {
   lowered final self::JSAny #this = value;
   return #this;
 }
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject {
+static inline-class-member method JSObject|(core::Object value) → self::JSObject {
   lowered final self::JSObject #this = value;
   return #this;
 }
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
   lowered final self::JSArray #this = value;
   return #this;
 }
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
   lowered final self::JSExportedDartObject #this = value;
   return #this;
 }
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber {
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
   lowered final self::JSNumber #this = value;
   return #this;
 }
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   return self::JSExportedDartObject|(#this);
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   return self::JSArray|(#this);
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   return self::JSNumber|(#this);
 static method main() → void {
   self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
index 2b7d7309139..ab3c6810dde 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.modular.expect
@@ -31,41 +31,41 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny {
+static inline-class-member method JSAny|(core::Object value) → self::JSAny {
   lowered final self::JSAny #this = value;
   return #this;
 }
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject {
+static inline-class-member method JSObject|(core::Object value) → self::JSObject {
   lowered final self::JSObject #this = value;
   return #this;
 }
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
   lowered final self::JSArray #this = value;
   return #this;
 }
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
   lowered final self::JSExportedDartObject #this = value;
   return #this;
 }
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber {
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
   lowered final self::JSNumber #this = value;
   return #this;
 }
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   return self::JSExportedDartObject|(#this);
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   return self::JSArray|(#this);
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   return self::JSNumber|(#this);
 static method main() → void {
   self::JSArray arr = self::ListToJSArray|get#toJS(<self::JSAny>[self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")]);
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
index 90717449f05..53515c56558 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.outline.expect
@@ -31,31 +31,31 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny
+static inline-class-member method JSAny|(core::Object value) → self::JSAny
   ;
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject
+static inline-class-member method JSObject|(core::Object value) → self::JSObject
   ;
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray
   ;
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject
   ;
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber
   ;
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   ;
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   ;
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
index 626950cb96e..97af8dda62b 100644
--- a/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue51556.dart.weak.transformed.expect
@@ -31,41 +31,41 @@ inline class JSNumber /* declaredRepresentationType = core::double */ implements
   constructor • = self::JSNumber|;
   tearoff • = self::JSNumber|_#new#tearOff;
 }
-static method JSAny|(core::Object value) → self::JSAny {
+static inline-class-member method JSAny|(core::Object value) → self::JSAny {
   lowered final self::JSAny #this = value;
   return #this;
 }
-static method JSAny|_#new#tearOff(core::Object value) → self::JSAny
+static inline-class-member method JSAny|_#new#tearOff(core::Object value) → self::JSAny
   return self::JSAny|(value);
-static method JSObject|(core::Object value) → self::JSObject {
+static inline-class-member method JSObject|(core::Object value) → self::JSObject {
   lowered final self::JSObject #this = value;
   return #this;
 }
-static method JSObject|_#new#tearOff(core::Object value) → self::JSObject
+static inline-class-member method JSObject|_#new#tearOff(core::Object value) → self::JSObject
   return self::JSObject|(value);
-static method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
+static inline-class-member method JSArray|(core::List<self::JSAny?> value) → self::JSArray {
   lowered final self::JSArray #this = value;
   return #this;
 }
-static method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
+static inline-class-member method JSArray|_#new#tearOff(core::List<self::JSAny?> value) → self::JSArray
   return self::JSArray|(value);
-static method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
+static inline-class-member method JSExportedDartObject|(core::Object value) → self::JSExportedDartObject {
   lowered final self::JSExportedDartObject #this = value;
   return #this;
 }
-static method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
+static inline-class-member method JSExportedDartObject|_#new#tearOff(core::Object value) → self::JSExportedDartObject
   return self::JSExportedDartObject|(value);
-static method JSNumber|(core::double value) → self::JSNumber {
+static inline-class-member method JSNumber|(core::double value) → self::JSNumber {
   lowered final self::JSNumber #this = value;
   return #this;
 }
-static method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
+static inline-class-member method JSNumber|_#new#tearOff(core::double value) → self::JSNumber
   return self::JSNumber|(value);
-static method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
+static extension-member method ObjectToJSExportedDartObject|get#toJS(lowered final core::Object #this) → self::JSExportedDartObject
   return self::JSExportedDartObject|(#this);
-static method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
+static extension-member method ListToJSArray|get#toJS(lowered final core::List<self::JSAny?> #this) → self::JSArray
   return self::JSArray|(#this);
-static method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
+static extension-member method DoubleToJSNumber|get#toJS(lowered final core::double #this) → self::JSNumber
   return self::JSNumber|(#this);
 static method main() → void {
   self::JSArray arr = self::ListToJSArray|get#toJS(core::_GrowableList::_literal2<self::JSAny>(self::DoubleToJSNumber|get#toJS(1.0), self::ObjectToJSExportedDartObject|get#toJS("foo")));
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
index 1034bcfa48c..570ffe51564 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.expect
@@ -37,61 +37,61 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo {
+static inline-class-member method Foo|(core::int i) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo {
+static inline-class-member method Foo|_(core::int i) → self::Foo {
   lowered final self::Foo #this = i;
   return #this;
 }
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
   lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo {
+static inline-class-member method Foo|erroneous() → self::Foo {
   lowered final self::Foo #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
   lowered final self::Bar<self::Bar|::T%> #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
   lowered final self::Bar<self::Bar|_::T%> #this = i;
   return #this;
 }
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
index 1034bcfa48c..570ffe51564 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.strong.transformed.expect
@@ -37,61 +37,61 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo {
+static inline-class-member method Foo|(core::int i) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo {
+static inline-class-member method Foo|_(core::int i) → self::Foo {
   lowered final self::Foo #this = i;
   return #this;
 }
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
   lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo {
+static inline-class-member method Foo|erroneous() → self::Foo {
   lowered final self::Foo #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
   lowered final self::Bar<self::Bar|::T%> #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
   lowered final self::Bar<self::Bar|_::T%> #this = i;
   return #this;
 }
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
index 1034bcfa48c..570ffe51564 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.expect
@@ -37,61 +37,61 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo {
+static inline-class-member method Foo|(core::int i) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo {
+static inline-class-member method Foo|_(core::int i) → self::Foo {
   lowered final self::Foo #this = i;
   return #this;
 }
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
   lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo {
+static inline-class-member method Foo|erroneous() → self::Foo {
   lowered final self::Foo #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
   lowered final self::Bar<self::Bar|::T%> #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
   lowered final self::Bar<self::Bar|_::T%> #this = i;
   return #this;
 }
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
index 1034bcfa48c..570ffe51564 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.modular.expect
@@ -37,61 +37,61 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo {
+static inline-class-member method Foo|(core::int i) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo {
+static inline-class-member method Foo|_(core::int i) → self::Foo {
   lowered final self::Foo #this = i;
   return #this;
 }
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
   lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo {
+static inline-class-member method Foo|erroneous() → self::Foo {
   lowered final self::Foo #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
   lowered final self::Bar<self::Bar|::T%> #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
   lowered final self::Bar<self::Bar|_::T%> #this = i;
   return #this;
 }
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
index b6436498201..f4961fcf465 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.outline.expect
@@ -22,37 +22,37 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo
+static inline-class-member method Foo|(core::int i) → self::Foo
   ;
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo
+static inline-class-member method Foo|_(core::int i) → self::Foo
   ;
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo
   ;
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo
   ;
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = null}) → self::Foo
   ;
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo
+static inline-class-member method Foo|erroneous() → self::Foo
   ;
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%>
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%>
   ;
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%>
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%>
   ;
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
index 1034bcfa48c..570ffe51564 100644
--- a/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52119.dart.weak.transformed.expect
@@ -37,61 +37,61 @@ inline class Bar<T extends core::Object? = dynamic> /* declaredRepresentationTyp
   constructor _ = self::Bar|_;
   tearoff _ = self::Bar|_#_#tearOff;
 }
-static method Foo|(core::int i) → self::Foo {
+static inline-class-member method Foo|(core::int i) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|_(i.{core::num::+}(2){(core::num) → core::int});
   return #this;
 }
-static method Foo|_#new#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#new#tearOff(core::int i) → self::Foo
   return self::Foo|(i);
-static method Foo|_(core::int i) → self::Foo {
+static inline-class-member method Foo|_(core::int i) → self::Foo {
   lowered final self::Foo #this = i;
   return #this;
 }
-static method Foo|_#_#tearOff(core::int i) → self::Foo
+static inline-class-member method Foo|_#_#tearOff(core::int i) → self::Foo
   return self::Foo|_(i);
-static method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed1(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   #this = self::Foo|named(a, subtract: b);
   return #this;
 }
-static method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed1#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed1(a, b);
-static method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
+static inline-class-member method Foo|redirectNamed2(core::int a, core::int b) → self::Foo {
   lowered final self::Foo #this;
   final core::int #t1 = b;
   #this = self::Foo|named(a, subtract: #t1);
   return #this;
 }
-static method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
+static inline-class-member method Foo|_#redirectNamed2#tearOff(core::int a, core::int b) → self::Foo
   return self::Foo|redirectNamed2(a, b);
-static method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
+static inline-class-member method Foo|named(core::int value, {required core::int subtract = #C1}) → self::Foo {
   lowered final self::Foo #this = value.{core::num::-}(subtract){(core::num) → core::int};
   return #this;
 }
-static method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
+static inline-class-member method Foo|_#named#tearOff(core::int value, {required core::int subtract}) → self::Foo
   return self::Foo|named(value, subtract: subtract);
-static method Foo|erroneous() → self::Foo {
+static inline-class-member method Foo|erroneous() → self::Foo {
   lowered final self::Foo #this;
   final dynamic #t2 = invalid-expression "pkg/front_end/testcases/inline_class/issue52119.dart:15:26: Error: Couldn't find constructor 'Foo.unresolved'.
   Foo.erroneous() : this.unresolved();
                          ^^^^^^^^^^";
   return #this;
 }
-static method Foo|_#erroneous#tearOff() → self::Foo
+static inline-class-member method Foo|_#erroneous#tearOff() → self::Foo
   return self::Foo|erroneous();
-static method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
+static inline-class-member method Bar|<T extends core::Object? = dynamic>(self::Bar|::T% i) → self::Bar<self::Bar|::T%> {
   lowered final self::Bar<self::Bar|::T%> #this;
   #this = self::Bar|_<self::Bar|::T%>(i);
   return #this;
 }
-static method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
+static inline-class-member method Bar|_#new#tearOff<T extends core::Object? = dynamic>(self::Bar|_#new#tearOff::T% i) → self::Bar<self::Bar|_#new#tearOff::T%>
   return self::Bar|<self::Bar|_#new#tearOff::T%>(i);
-static method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
+static inline-class-member method Bar|_<T extends core::Object? = dynamic>(self::Bar|_::T% i) → self::Bar<self::Bar|_::T%> {
   lowered final self::Bar<self::Bar|_::T%> #this = i;
   return #this;
 }
-static method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
+static inline-class-member method Bar|_#_#tearOff<T extends core::Object? = dynamic>(self::Bar|_#_#tearOff::T% i) → self::Bar<self::Bar|_#_#tearOff::T%>
   return self::Bar|_<self::Bar|_#_#tearOff::T%>(i);
 static method main() → dynamic {
   self::expect(44, self::Foo|(42) as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
index 0c348f3f626..7ca22252dca 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.expect
@@ -8,17 +8,17 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X {
+static inline-class-member method X|() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X {
+static inline-class-member method X|named() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void {
   core::print(#C1(){() → self::X} as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
index 0c348f3f626..7ca22252dca 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.strong.transformed.expect
@@ -8,17 +8,17 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X {
+static inline-class-member method X|() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X {
+static inline-class-member method X|named() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void {
   core::print(#C1(){() → self::X} as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
index 0c348f3f626..7ca22252dca 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.expect
@@ -8,17 +8,17 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X {
+static inline-class-member method X|() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X {
+static inline-class-member method X|named() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void {
   core::print(#C1(){() → self::X} as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
index 0c348f3f626..7ca22252dca 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.modular.expect
@@ -8,17 +8,17 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X {
+static inline-class-member method X|() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X {
+static inline-class-member method X|named() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void {
   core::print(#C1(){() → self::X} as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
index 79778c12fee..cac9085552d 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.outline.expect
@@ -8,13 +8,13 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X
+static inline-class-member method X|() → self::X
   ;
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X
+static inline-class-member method X|named() → self::X
   ;
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
index 0c348f3f626..7ca22252dca 100644
--- a/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52240.dart.weak.transformed.expect
@@ -8,17 +8,17 @@ inline class X /* declaredRepresentationType = core::int */ {
   constructor named = self::X|named;
   tearoff named = self::X|_#named#tearOff;
 }
-static method X|() → self::X {
+static inline-class-member method X|() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#new#tearOff() → self::X
+static inline-class-member method X|_#new#tearOff() → self::X
   return self::X|();
-static method X|named() → self::X {
+static inline-class-member method X|named() → self::X {
   lowered final self::X #this = 0;
   return #this;
 }
-static method X|_#named#tearOff() → self::X
+static inline-class-member method X|_#named#tearOff() → self::X
   return self::X|named();
 static method main() → void {
   core::print(#C1(){() → self::X} as{Unchecked} core::int);
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
index 34eba3157e3..71d9de55bec 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.expect
@@ -14,11 +14,11 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id {
+static inline-class-member method Id|(core::int id) → self::Id {
   lowered final self::Id #this = id;
   return #this;
 }
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic {
   self::Id c = self::Id|(2);
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
index 34eba3157e3..71d9de55bec 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.strong.transformed.expect
@@ -14,11 +14,11 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id {
+static inline-class-member method Id|(core::int id) → self::Id {
   lowered final self::Id #this = id;
   return #this;
 }
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic {
   self::Id c = self::Id|(2);
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
index 1e9691ddb61..15823d53fa1 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.expect
@@ -14,11 +14,11 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id {
+static inline-class-member method Id|(core::int id) → self::Id {
   lowered final self::Id #this = id;
   return #this;
 }
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic {
   self::Id c = self::Id|(2);
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
index 1e9691ddb61..15823d53fa1 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.modular.expect
@@ -14,11 +14,11 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id {
+static inline-class-member method Id|(core::int id) → self::Id {
   lowered final self::Id #this = id;
   return #this;
 }
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic {
   self::Id c = self::Id|(2);
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
index 3a515bfd0ae..0da6245ec2e 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.outline.expect
@@ -6,9 +6,9 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id
+static inline-class-member method Id|(core::int id) → self::Id
   ;
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
index 1e9691ddb61..15823d53fa1 100644
--- a/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/issue52284.dart.weak.transformed.expect
@@ -14,11 +14,11 @@ inline class Id /* declaredRepresentationType = core::int */ {
   constructor • = self::Id|;
   tearoff • = self::Id|_#new#tearOff;
 }
-static method Id|(core::int id) → self::Id {
+static inline-class-member method Id|(core::int id) → self::Id {
   lowered final self::Id #this = id;
   return #this;
 }
-static method Id|_#new#tearOff(core::int id) → self::Id
+static inline-class-member method Id|_#new#tearOff(core::int id) → self::Id
   return self::Id|(id);
 static method test() → dynamic {
   self::Id c = self::Id|(2);
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
index 86150225d15..6b2ac0c2478 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.expect
@@ -13,11 +13,11 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A {
+static inline-class-member method A|name1(core::int value) → self::A {
   lowered final self::A #this = value;
   return #this;
 }
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
index 86150225d15..6b2ac0c2478 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.strong.transformed.expect
@@ -13,11 +13,11 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A {
+static inline-class-member method A|name1(core::int value) → self::A {
   lowered final self::A #this = value;
   return #this;
 }
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
index 86150225d15..6b2ac0c2478 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.expect
@@ -13,11 +13,11 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A {
+static inline-class-member method A|name1(core::int value) → self::A {
   lowered final self::A #this = value;
   return #this;
 }
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
index 86150225d15..6b2ac0c2478 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.modular.expect
@@ -13,11 +13,11 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A {
+static inline-class-member method A|name1(core::int value) → self::A {
   lowered final self::A #this = value;
   return #this;
 }
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
index 89e57c3d104..32c6c1c62f9 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.outline.expect
@@ -6,9 +6,9 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A
+static inline-class-member method A|name1(core::int value) → self::A
   ;
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   ;
diff --git a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
index 86150225d15..6b2ac0c2478 100644
--- a/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/member_not_found.dart.weak.transformed.expect
@@ -13,11 +13,11 @@ inline class A /* declaredRepresentationType = core::int */ {
   constructor name1 = self::A|name1;
   tearoff name1 = self::A|_#name1#tearOff;
 }
-static method A|name1(core::int value) → self::A {
+static inline-class-member method A|name1(core::int value) → self::A {
   lowered final self::A #this = value;
   return #this;
 }
-static method A|_#name1#tearOff(core::int value) → self::A
+static inline-class-member method A|_#name1#tearOff(core::int value) → self::A
   return self::A|name1(value);
 static method method() → void
   return invalid-expression "pkg/front_end/testcases/inline_class/member_not_found.dart:11:20: Error: Member not found: 'A.name2'.
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect b/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
index 893740e2e3e..0902ae563a3 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.strong.expect
@@ -57,16 +57,16 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,29 +109,29 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   return 42;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   return 87;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   return 123;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   return 321;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
index ae9b6f1d2b8..df01bef39f1 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.strong.transformed.expect
@@ -57,16 +57,16 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,29 +109,29 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   return 42;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   return 87;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   return 123;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   return 321;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
index 893740e2e3e..0902ae563a3 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.expect
@@ -57,16 +57,16 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,29 +109,29 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   return 42;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   return 87;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   return 123;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   return 321;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
index 893740e2e3e..0902ae563a3 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.modular.expect
@@ -57,16 +57,16 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,29 +109,29 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   return 42;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   return 87;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   return 123;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   return 321;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
index 0befa5861dd..76da6b276de 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.outline.expect
@@ -24,41 +24,41 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   ;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void
   ;
-static method InlineClass|(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass
   ;
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic
   ;
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   ;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   ;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   ;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void
   ;
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   ;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   ;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void
   ;
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   ;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   ;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic
   ;
diff --git a/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
index ae9b6f1d2b8..df01bef39f1 100644
--- a/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/method_access.dart.weak.transformed.expect
@@ -57,16 +57,16 @@ inline class InlineClass /* declaredRepresentationType = core::int */ {
   constructor • = self::InlineClass|;
   tearoff • = self::InlineClass|_#new#tearOff;
 }
-static method _extension#0|get#setter(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#setter(lowered final core::Object #this) → core::int
   return 42;
-static method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
-static method InlineClass|(core::int it) → self::InlineClass {
+static extension-member method _extension#0|set#getter(lowered final core::Object #this, core::int value) → void {}
+static inline-class-member method InlineClass|(core::int it) → self::InlineClass {
   lowered final self::InlineClass #this = it;
   return #this;
 }
-static method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
+static inline-class-member method InlineClass|_#new#tearOff(core::int it) → self::InlineClass
   return self::InlineClass|(it);
-static method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
+static inline-class-member method InlineClass|test(lowered final self::InlineClass #this) → dynamic {
   core::int a = self::InlineClass|+(#this, 2);
   core::int b = self::InlineClass|unary-(#this);
   core::int c = self::InlineClass|[](#this, 2);
@@ -109,29 +109,29 @@ Try correcting the name to the name of an existing setter, or defining a setter
   core::int n1 = self::InlineClass|call(#this);
   core::int n2 = self::InlineClass|call(#this);
 }
-static method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
+static inline-class-member method InlineClass|get#test(lowered final self::InlineClass #this) → () → dynamic
   return () → dynamic => self::InlineClass|test(#this);
-static method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
+static inline-class-member method InlineClass|+(lowered final self::InlineClass #this, core::int other) → core::int
   return 42;
-static method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|unary-(lowered final self::InlineClass #this) → core::int
   return 87;
-static method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
+static inline-class-member method InlineClass|[](lowered final self::InlineClass #this, core::int index) → core::int
   return 123;
-static method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
-static method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|[]=(lowered final self::InlineClass #this, core::int index, core::int value) → void {}
+static inline-class-member method InlineClass|get#getter(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|method(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|method(lowered final self::InlineClass #this) → core::int
   return 42;
-static method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#method(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|method(#this);
-static method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
-static method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
+static inline-class-member method InlineClass|set#setter(lowered final self::InlineClass #this, core::int value) → void {}
+static inline-class-member method InlineClass|genericMethod<T extends core::Object? = dynamic>(lowered final self::InlineClass #this, self::InlineClass|genericMethod::T% t) → self::InlineClass|genericMethod::T%
   return t;
-static method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
+static inline-class-member method InlineClass|get#genericMethod(lowered final self::InlineClass #this) → <T extends core::Object? = dynamic>(T%) → T%
   return <T extends core::Object? = dynamic>(T% t) → T% => self::InlineClass|genericMethod<T%>(#this, t);
-static method InlineClass|call(lowered final self::InlineClass #this) → core::int
+static inline-class-member method InlineClass|call(lowered final self::InlineClass #this) → core::int
   return 321;
-static method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
+static inline-class-member method InlineClass|get#call(lowered final self::InlineClass #this) → () → core::int
   return () → core::int => self::InlineClass|call(#this);
 static method test(self::InlineClass ic) → dynamic {
   core::int a = self::InlineClass|+(ic, 2);
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect b/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
index 87ae4ac2fe4..b95a1072d15 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.strong.expect
@@ -37,17 +37,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void {
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
   self::Class local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   return 42;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
   self::Class local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -55,31 +55,31 @@ static method Class|instanceMethod2(lowered final self::Class #this, core::Strin
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void {
+static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
   core::int localG1 = self::Class|genericStaticMethod<core::int>(0);
   core::String localG2 = self::Class|genericStaticMethod<core::String>("");
   core::num localG3 = self::Class|genericStaticMethod<core::num>(0);
 }
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
   self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
   self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -87,19 +87,19 @@ static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lo
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void {
+static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
   core::int localG1 = self::GenericClass|genericStaticMethod<core::int>(0);
   core::String localG2 = self::GenericClass|genericStaticMethod<core::String>("");
   core::num localG3 = self::GenericClass|genericStaticMethod<core::num>(0);
 }
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   return s;
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
index 87ae4ac2fe4..b95a1072d15 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.strong.transformed.expect
@@ -37,17 +37,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void {
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
   self::Class local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   return 42;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
   self::Class local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -55,31 +55,31 @@ static method Class|instanceMethod2(lowered final self::Class #this, core::Strin
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void {
+static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
   core::int localG1 = self::Class|genericStaticMethod<core::int>(0);
   core::String localG2 = self::Class|genericStaticMethod<core::String>("");
   core::num localG3 = self::Class|genericStaticMethod<core::num>(0);
 }
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
   self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
   self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -87,19 +87,19 @@ static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lo
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void {
+static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
   core::int localG1 = self::GenericClass|genericStaticMethod<core::int>(0);
   core::String localG2 = self::GenericClass|genericStaticMethod<core::String>("");
   core::num localG3 = self::GenericClass|genericStaticMethod<core::num>(0);
 }
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   return s;
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
index 87ae4ac2fe4..b95a1072d15 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.expect
@@ -37,17 +37,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void {
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
   self::Class local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   return 42;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
   self::Class local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -55,31 +55,31 @@ static method Class|instanceMethod2(lowered final self::Class #this, core::Strin
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void {
+static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
   core::int localG1 = self::Class|genericStaticMethod<core::int>(0);
   core::String localG2 = self::Class|genericStaticMethod<core::String>("");
   core::num localG3 = self::Class|genericStaticMethod<core::num>(0);
 }
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
   self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
   self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -87,19 +87,19 @@ static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lo
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void {
+static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
   core::int localG1 = self::GenericClass|genericStaticMethod<core::int>(0);
   core::String localG2 = self::GenericClass|genericStaticMethod<core::String>("");
   core::num localG3 = self::GenericClass|genericStaticMethod<core::num>(0);
 }
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   return s;
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
index 87ae4ac2fe4..b95a1072d15 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.modular.expect
@@ -37,17 +37,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void {
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
   self::Class local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   return 42;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
   self::Class local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -55,31 +55,31 @@ static method Class|instanceMethod2(lowered final self::Class #this, core::Strin
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void {
+static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
   core::int localG1 = self::Class|genericStaticMethod<core::int>(0);
   core::String localG2 = self::Class|genericStaticMethod<core::String>("");
   core::num localG3 = self::Class|genericStaticMethod<core::num>(0);
 }
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
   self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
   self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -87,19 +87,19 @@ static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lo
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void {
+static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
   core::int localG1 = self::GenericClass|genericStaticMethod<core::int>(0);
   core::String localG2 = self::GenericClass|genericStaticMethod<core::String>("");
   core::num localG3 = self::GenericClass|genericStaticMethod<core::num>(0);
 }
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   return s;
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
index 42ad4a5509c..8b51f6abe02 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.outline.expect
@@ -24,39 +24,39 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void
   ;
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   ;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [has-declared-initializer core::int i]) → void
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [has-declared-initializer core::int i]) → void
   ;
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   ;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void
+static inline-class-member method Class|staticMethod() → void
   ;
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   ;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void
   ;
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   ;
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {has-declared-initializer core::int i}) → void
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {has-declared-initializer core::int i}) → void
   ;
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   ;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void
+static inline-class-member method GenericClass|staticMethod() → void
   ;
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   ;
diff --git a/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
index 87ae4ac2fe4..b95a1072d15 100644
--- a/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/procedures.dart.weak.transformed.expect
@@ -37,17 +37,17 @@ inline class GenericClass<T extends core::Object? = dynamic> /* declaredRepresen
   static method staticMethod = self::GenericClass|staticMethod;
   static method genericStaticMethod = self::GenericClass|genericStaticMethod;
 }
-static method Class|instanceMethod(lowered final self::Class #this) → void {
+static inline-class-member method Class|instanceMethod(lowered final self::Class #this) → void {
   self::Class local = #this;
   void localM = self::Class|instanceMethod(#this);
   () → void localT = self::Class|get#instanceMethod(#this);
   core::int localG = self::Class|get#instanceGetter(#this);
 }
-static method Class|get#instanceMethod(lowered final self::Class #this) → () → void
+static inline-class-member method Class|get#instanceMethod(lowered final self::Class #this) → () → void
   return () → void => self::Class|instanceMethod(#this);
-static method Class|get#instanceGetter(lowered final self::Class #this) → core::int
+static inline-class-member method Class|get#instanceGetter(lowered final self::Class #this) → core::int
   return 42;
-static method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
+static inline-class-member method Class|instanceMethod2(lowered final self::Class #this, core::String s, [core::int i = #C1]) → void {
   self::Class local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -55,31 +55,31 @@ static method Class|instanceMethod2(lowered final self::Class #this, core::Strin
   core::int localG2 = self::Class|genericInstanceMethod<core::int>(#this, i);
   core::num localG3 = self::Class|genericInstanceMethod<core::num>(#this, i);
 }
-static method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
+static inline-class-member method Class|get#instanceMethod2(lowered final self::Class #this) → (core::String, [core::int]) → void
   return (core::String s, [core::int i = #C1]) → void => self::Class|instanceMethod2(#this, s, i);
-static method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
+static inline-class-member method Class|genericInstanceMethod<S extends core::Object? = dynamic>(lowered final self::Class #this, self::Class|genericInstanceMethod::S% s) → self::Class|genericInstanceMethod::S%
   return s;
-static method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method Class|get#genericInstanceMethod(lowered final self::Class #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::Class|genericInstanceMethod<S%>(#this, s);
-static method Class|staticMethod() → void {
+static inline-class-member method Class|staticMethod() → void {
   self::Class|staticMethod();
   core::int localG1 = self::Class|genericStaticMethod<core::int>(0);
   core::String localG2 = self::Class|genericStaticMethod<core::String>("");
   core::num localG3 = self::Class|genericStaticMethod<core::num>(0);
 }
-static method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
+static inline-class-member method Class|genericStaticMethod<S extends core::Object? = dynamic>(self::Class|genericStaticMethod::S% s) → self::Class|genericStaticMethod::S%
   return s;
-static method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
+static inline-class-member method GenericClass|instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod::T%> #this) → void {
   self::GenericClass<self::GenericClass|instanceMethod::T%> local = #this;
   void localM = self::GenericClass|instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   () → void localT = self::GenericClass|get#instanceMethod<self::GenericClass|instanceMethod::T%>(#this);
   self::GenericClass|instanceMethod::T% localG = self::GenericClass|get#instanceGetter<self::GenericClass|instanceMethod::T%>(#this);
 }
-static method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
+static inline-class-member method GenericClass|get#instanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod::T%> #this) → () → void
   return () → void => self::GenericClass|instanceMethod<self::GenericClass|get#instanceMethod::T%>(#this);
-static method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
+static inline-class-member method GenericClass|get#instanceGetter<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceGetter::T%> #this) → self::GenericClass|get#instanceGetter::T%
   return throw "";
-static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
+static inline-class-member method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|instanceMethod2::T%> #this, core::String s, {core::int i = #C1}) → void {
   self::GenericClass<self::GenericClass|instanceMethod2::T%> local = #this;
   core::String localS = s;
   core::int localI = i;
@@ -87,19 +87,19 @@ static method GenericClass|instanceMethod2<T extends core::Object? = dynamic>(lo
   core::int localG2 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::int>(#this, i);
   core::num localG3 = self::GenericClass|genericInstanceMethod<self::GenericClass|instanceMethod2::T%, core::num>(#this, i);
 }
-static method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
+static inline-class-member method GenericClass|get#instanceMethod2<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#instanceMethod2::T%> #this) → (core::String, {i: core::int}) → void
   return (core::String s, {core::int i = #C1}) → void => self::GenericClass|instanceMethod2<self::GenericClass|get#instanceMethod2::T%>(#this, s, i: i);
-static method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
+static inline-class-member method GenericClass|genericInstanceMethod<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|genericInstanceMethod::T%> #this, self::GenericClass|genericInstanceMethod::S% s) → self::GenericClass|genericInstanceMethod::S%
   return s;
-static method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
+static inline-class-member method GenericClass|get#genericInstanceMethod<T extends core::Object? = dynamic>(lowered final self::GenericClass<self::GenericClass|get#genericInstanceMethod::T%> #this) → <S extends core::Object? = dynamic>(S%) → S%
   return <S extends core::Object? = dynamic>(S% s) → S% => self::GenericClass|genericInstanceMethod<self::GenericClass|get#genericInstanceMethod::T%, S%>(#this, s);
-static method GenericClass|staticMethod() → void {
+static inline-class-member method GenericClass|staticMethod() → void {
   self::GenericClass|staticMethod();
   core::int localG1 = self::GenericClass|genericStaticMethod<core::int>(0);
   core::String localG2 = self::GenericClass|genericStaticMethod<core::String>("");
   core::num localG3 = self::GenericClass|genericStaticMethod<core::num>(0);
 }
-static method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
+static inline-class-member method GenericClass|genericStaticMethod<S extends core::Object? = dynamic>(self::GenericClass|genericStaticMethod::S% s) → self::GenericClass|genericStaticMethod::S%
   return s;
 
 constants  {
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.strong.expect b/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
index e07e2cda7cf..1beffafa792 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.strong.expect
@@ -42,24 +42,24 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static method Static|(core::bool instanceField) → self::Static {
+static inline-class-member method Static|(core::bool instanceField) → self::Static {
   lowered final self::Static #this = instanceField;
   return #this;
 }
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple {
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
   lowered final self::Multiple #this = instanceField1;
   return #this;
 }
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate {
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
   lowered final self::Duplicate #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect b/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
index e07e2cda7cf..1beffafa792 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.strong.transformed.expect
@@ -42,24 +42,24 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static method Static|(core::bool instanceField) → self::Static {
+static inline-class-member method Static|(core::bool instanceField) → self::Static {
   lowered final self::Static #this = instanceField;
   return #this;
 }
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple {
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
   lowered final self::Multiple #this = instanceField1;
   return #this;
 }
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate {
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
   lowered final self::Duplicate #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
index e07e2cda7cf..1beffafa792 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.expect
@@ -42,24 +42,24 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static method Static|(core::bool instanceField) → self::Static {
+static inline-class-member method Static|(core::bool instanceField) → self::Static {
   lowered final self::Static #this = instanceField;
   return #this;
 }
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple {
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
   lowered final self::Multiple #this = instanceField1;
   return #this;
 }
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate {
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
   lowered final self::Duplicate #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
index e07e2cda7cf..1beffafa792 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.modular.expect
@@ -42,24 +42,24 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static method Static|(core::bool instanceField) → self::Static {
+static inline-class-member method Static|(core::bool instanceField) → self::Static {
   lowered final self::Static #this = instanceField;
   return #this;
 }
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple {
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
   lowered final self::Multiple #this = instanceField1;
   return #this;
 }
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate {
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
   lowered final self::Duplicate #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
index e3091ece75b..be7d7fc5bf4 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.outline.expect
@@ -28,15 +28,15 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField;
-static method Static|(core::bool instanceField) → self::Static
+static inline-class-member method Static|(core::bool instanceField) → self::Static
   ;
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple
   ;
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate
   ;
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect b/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
index e07e2cda7cf..1beffafa792 100644
--- a/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/inline_class/representation.dart.weak.transformed.expect
@@ -42,24 +42,24 @@ inline class Duplicate /* declaredRepresentationType = core::bool */ {
   tearoff • = self::Duplicate|_#new#tearOff;
 }
 static field core::int Static|staticField = 42;
-static method Static|(core::bool instanceField) → self::Static {
+static inline-class-member method Static|(core::bool instanceField) → self::Static {
   lowered final self::Static #this = instanceField;
   return #this;
 }
-static method Static|_#new#tearOff(core::bool instanceField) → self::Static
+static inline-class-member method Static|_#new#tearOff(core::bool instanceField) → self::Static
   return self::Static|(instanceField);
-static method Multiple|(core::bool instanceField1) → self::Multiple {
+static inline-class-member method Multiple|(core::bool instanceField1) → self::Multiple {
   lowered final self::Multiple #this = instanceField1;
   return #this;
 }
-static method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
+static inline-class-member method Multiple|_#new#tearOff(core::bool instanceField1) → self::Multiple
   return self::Multiple|(instanceField1);
-static method Duplicate|(core::int instanceField) → self::Duplicate {
+static inline-class-member method Duplicate|(core::int instanceField) → self::Duplicate {
   lowered final self::Duplicate #this;
   final dynamic #t1 = invalid-expression "pkg/front_end/testcases/inline_class/representation.dart:25:18: Error: Can't use 'instanceField' because it is declared more than once.
   Duplicate(this.instanceField);
                  ^^^^^^^^^^^^^";
   return #this;
 }
-static method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
+static inline-class-member method Duplicate|_#new#tearOff(core::int instanceField) → self::Duplicate
   return self::Duplicate|(instanceField);
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.expect
index be2183e6fd8..6f85278b64f 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.expect
@@ -148,22 +148,22 @@ static set finalTopLevelField(core::int finalTopLevelField#param) → void
 static get finalTopLevelFieldWithInitializer() → core::int
   return let final core::int? #t21 = self::_#finalTopLevelFieldWithInitializer in #t21 == null ?{core::int} let final core::int #t22 = 0 in self::_#finalTopLevelFieldWithInitializer == null ?{core::int} self::_#finalTopLevelFieldWithInitializer = #t22 : throw new _in::LateError::fieldADI("finalTopLevelFieldWithInitializer") : #t21{core::int};
 @#C1
-static get Extension|extensionStaticField() → core::int
+static extension-member get Extension|extensionStaticField() → core::int
   return let final core::int? #t23 = self::_#Extension|extensionStaticField in #t23 == null ?{core::int} throw new _in::LateError::fieldNI("extensionStaticField") : #t23{core::int};
 @#C1
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void
   self::_#Extension|extensionStaticField = extensionStaticField#param;
 @#C1
-static get Extension|finalExtensionStaticField() → core::int
+static extension-member get Extension|finalExtensionStaticField() → core::int
   return let final core::int? #t24 = self::_#Extension|finalExtensionStaticField in #t24 == null ?{core::int} throw new _in::LateError::fieldNI("finalExtensionStaticField") : #t24{core::int};
 @#C1
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
   if(self::_#Extension|finalExtensionStaticField == null)
     self::_#Extension|finalExtensionStaticField = finalExtensionStaticField#param;
   else
     throw new _in::LateError::fieldAI("finalExtensionStaticField");
 @#C1
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int
   return let final core::int? #t25 = self::_#Extension|finalExtensionStaticFieldWithInitializer in #t25 == null ?{core::int} let final core::int #t26 = 0 in self::_#Extension|finalExtensionStaticFieldWithInitializer == null ?{core::int} self::_#Extension|finalExtensionStaticFieldWithInitializer = #t26 : throw new _in::LateError::fieldADI("finalExtensionStaticFieldWithInitializer") : #t25{core::int};
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.transformed.expect
index fb2230445dd..4d63d4ac33e 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.strong.transformed.expect
@@ -148,22 +148,22 @@ static set finalTopLevelField(core::int finalTopLevelField#param) → void
 static get finalTopLevelFieldWithInitializer() → core::int
   return let final core::int? #t21 = self::_#finalTopLevelFieldWithInitializer in #t21 == null ?{core::int} let final core::int #t22 = 0 in self::_#finalTopLevelFieldWithInitializer == null ?{core::int} self::_#finalTopLevelFieldWithInitializer = #t22 : throw new _in::LateError::fieldADI("finalTopLevelFieldWithInitializer") : #t21{core::int};
 @#C1
-static get Extension|extensionStaticField() → core::int
+static extension-member get Extension|extensionStaticField() → core::int
   return let final core::int? #t23 = self::_#Extension|extensionStaticField in #t23 == null ?{core::int} throw new _in::LateError::fieldNI("extensionStaticField") : #t23{core::int};
 @#C1
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void
   self::_#Extension|extensionStaticField = extensionStaticField#param;
 @#C1
-static get Extension|finalExtensionStaticField() → core::int
+static extension-member get Extension|finalExtensionStaticField() → core::int
   return let final core::int? #t24 = self::_#Extension|finalExtensionStaticField in #t24 == null ?{core::int} throw new _in::LateError::fieldNI("finalExtensionStaticField") : #t24{core::int};
 @#C1
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
   if(self::_#Extension|finalExtensionStaticField == null)
     self::_#Extension|finalExtensionStaticField = finalExtensionStaticField#param;
   else
     throw new _in::LateError::fieldAI("finalExtensionStaticField");
 @#C1
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int
   return let final core::int? #t25 = self::_#Extension|finalExtensionStaticFieldWithInitializer in #t25 == null ?{core::int} let final core::int #t26 = 0 in self::_#Extension|finalExtensionStaticFieldWithInitializer == null ?{core::int} self::_#Extension|finalExtensionStaticFieldWithInitializer = #t26 : throw new _in::LateError::fieldADI("finalExtensionStaticFieldWithInitializer") : #t25{core::int};
 static method main() → dynamic {}
 
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.expect
index 44c09cf6766..bff979fdb4a 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.expect
@@ -235,18 +235,18 @@ static get finalTopLevelFieldWithInitializer() → core::int {
   return let final core::int? #t22 = self::_#finalTopLevelFieldWithInitializer in #t22{core::int};
 }
 @#C1
-static get Extension|extensionStaticField() → core::int
+static extension-member get Extension|extensionStaticField() → core::int
   return self::_#Extension|extensionStaticField#isSet ?{core::int} let final core::int? #t23 = self::_#Extension|extensionStaticField in #t23{core::int} : throw new _in::LateError::fieldNI("extensionStaticField");
 @#C1
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
   self::_#Extension|extensionStaticField#isSet = true;
   self::_#Extension|extensionStaticField = extensionStaticField#param;
 }
 @#C1
-static get Extension|finalExtensionStaticField() → core::int
+static extension-member get Extension|finalExtensionStaticField() → core::int
   return self::_#Extension|finalExtensionStaticField#isSet ?{core::int} let final core::int? #t24 = self::_#Extension|finalExtensionStaticField in #t24{core::int} : throw new _in::LateError::fieldNI("finalExtensionStaticField");
 @#C1
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
   if(self::_#Extension|finalExtensionStaticField#isSet)
     throw new _in::LateError::fieldAI("finalExtensionStaticField");
   else {
@@ -254,7 +254,7 @@ static set Extension|finalExtensionStaticField(core::int finalExtensionStaticFie
     self::_#Extension|finalExtensionStaticField = finalExtensionStaticField#param;
   }
 @#C1
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
   if(!self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet) {
     final core::int #t25 = 0;
     if(self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet)
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.modular.expect
index 44c09cf6766..bff979fdb4a 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.modular.expect
@@ -235,18 +235,18 @@ static get finalTopLevelFieldWithInitializer() → core::int {
   return let final core::int? #t22 = self::_#finalTopLevelFieldWithInitializer in #t22{core::int};
 }
 @#C1
-static get Extension|extensionStaticField() → core::int
+static extension-member get Extension|extensionStaticField() → core::int
   return self::_#Extension|extensionStaticField#isSet ?{core::int} let final core::int? #t23 = self::_#Extension|extensionStaticField in #t23{core::int} : throw new _in::LateError::fieldNI("extensionStaticField");
 @#C1
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
   self::_#Extension|extensionStaticField#isSet = true;
   self::_#Extension|extensionStaticField = extensionStaticField#param;
 }
 @#C1
-static get Extension|finalExtensionStaticField() → core::int
+static extension-member get Extension|finalExtensionStaticField() → core::int
   return self::_#Extension|finalExtensionStaticField#isSet ?{core::int} let final core::int? #t24 = self::_#Extension|finalExtensionStaticField in #t24{core::int} : throw new _in::LateError::fieldNI("finalExtensionStaticField");
 @#C1
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
   if(self::_#Extension|finalExtensionStaticField#isSet)
     throw new _in::LateError::fieldAI("finalExtensionStaticField");
   else {
@@ -254,7 +254,7 @@ static set Extension|finalExtensionStaticField(core::int finalExtensionStaticFie
     self::_#Extension|finalExtensionStaticField = finalExtensionStaticField#param;
   }
 @#C1
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
   if(!self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet) {
     final core::int #t25 = 0;
     if(self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet)
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.outline.expect
index 4a11593a615..298cf6f2f72 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.outline.expect
@@ -125,15 +125,15 @@ static set finalTopLevelField(core::int finalTopLevelField#param) → void;
 @self::Annotation::•()
 static get finalTopLevelFieldWithInitializer() → core::int;
 @self::Annotation::•()
-static get Extension|extensionStaticField() → core::int;
+static extension-member get Extension|extensionStaticField() → core::int;
 @self::Annotation::•()
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void;
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void;
 @self::Annotation::•()
-static get Extension|finalExtensionStaticField() → core::int;
+static extension-member get Extension|finalExtensionStaticField() → core::int;
 @self::Annotation::•()
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void;
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void;
 @self::Annotation::•()
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int;
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int;
 static method main() → dynamic
   ;
 
diff --git a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.transformed.expect
index 44c09cf6766..bff979fdb4a 100644
--- a/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_annotations.dart.weak.transformed.expect
@@ -235,18 +235,18 @@ static get finalTopLevelFieldWithInitializer() → core::int {
   return let final core::int? #t22 = self::_#finalTopLevelFieldWithInitializer in #t22{core::int};
 }
 @#C1
-static get Extension|extensionStaticField() → core::int
+static extension-member get Extension|extensionStaticField() → core::int
   return self::_#Extension|extensionStaticField#isSet ?{core::int} let final core::int? #t23 = self::_#Extension|extensionStaticField in #t23{core::int} : throw new _in::LateError::fieldNI("extensionStaticField");
 @#C1
-static set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
+static extension-member set Extension|extensionStaticField(core::int extensionStaticField#param) → void {
   self::_#Extension|extensionStaticField#isSet = true;
   self::_#Extension|extensionStaticField = extensionStaticField#param;
 }
 @#C1
-static get Extension|finalExtensionStaticField() → core::int
+static extension-member get Extension|finalExtensionStaticField() → core::int
   return self::_#Extension|finalExtensionStaticField#isSet ?{core::int} let final core::int? #t24 = self::_#Extension|finalExtensionStaticField in #t24{core::int} : throw new _in::LateError::fieldNI("finalExtensionStaticField");
 @#C1
-static set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
+static extension-member set Extension|finalExtensionStaticField(core::int finalExtensionStaticField#param) → void
   if(self::_#Extension|finalExtensionStaticField#isSet)
     throw new _in::LateError::fieldAI("finalExtensionStaticField");
   else {
@@ -254,7 +254,7 @@ static set Extension|finalExtensionStaticField(core::int finalExtensionStaticFie
     self::_#Extension|finalExtensionStaticField = finalExtensionStaticField#param;
   }
 @#C1
-static get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
+static extension-member get Extension|finalExtensionStaticFieldWithInitializer() → core::int {
   if(!self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet) {
     final core::int #t25 = 0;
     if(self::_#Extension|finalExtensionStaticFieldWithInitializer#isSet)
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.expect
index fd640fa7bb5..273dc539a1e 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.expect
@@ -80,15 +80,15 @@ static get lateTopLevelField1() → core::int
   return let final core::int? #t6 = self::_#lateTopLevelField1 in #t6 == null ?{core::int} self::_#lateTopLevelField1 = 123 : #t6{core::int};
 static set lateTopLevelField1(core::int lateTopLevelField1#param) → void
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t7 = self::_#Extension|lateExtensionField1 in #t7 == null ?{core::int} self::_#Extension|lateExtensionField1 = 87 : #t7{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t8 = self::_#Extension|lateExtensionField2 in #t8 == null ?{core::int} self::_#Extension|lateExtensionField2 = 42 : #t8{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.transformed.expect
index fd640fa7bb5..273dc539a1e 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.strong.transformed.expect
@@ -80,15 +80,15 @@ static get lateTopLevelField1() → core::int
   return let final core::int? #t6 = self::_#lateTopLevelField1 in #t6 == null ?{core::int} self::_#lateTopLevelField1 = 123 : #t6{core::int};
 static set lateTopLevelField1(core::int lateTopLevelField1#param) → void
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t7 = self::_#Extension|lateExtensionField1 in #t7 == null ?{core::int} self::_#Extension|lateExtensionField1 = 87 : #t7{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t8 = self::_#Extension|lateExtensionField2 in #t8 == null ?{core::int} self::_#Extension|lateExtensionField2 = 42 : #t8{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.expect
index ddb78d56e25..d2c35b626f2 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.expect
@@ -116,29 +116,29 @@ static set lateTopLevelField1(core::int lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = 87;
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return let final core::int? #t7 = self::_#Extension|lateExtensionField1 in #t7{core::int};
 }
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = 42;
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return let final core::int? #t8 = self::_#Extension|lateExtensionField2 in #t8{core::int};
 }
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.modular.expect
index ddb78d56e25..d2c35b626f2 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.modular.expect
@@ -116,29 +116,29 @@ static set lateTopLevelField1(core::int lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = 87;
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return let final core::int? #t7 = self::_#Extension|lateExtensionField1 in #t7{core::int};
 }
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = 42;
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return let final core::int? #t8 = self::_#Extension|lateExtensionField2 in #t8{core::int};
 }
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.outline.expect
index 226e1029b38..accd0085a50 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.outline.expect
@@ -50,11 +50,11 @@ static field core::int? _#Extension|lateExtensionField2;
 static field core::bool _#Extension|lateExtensionField2#isSet;
 static get lateTopLevelField1() → core::int;
 static set lateTopLevelField1(core::int lateTopLevelField1#param) → void;
-static get Extension|lateExtensionField1() → core::int;
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
-static get Extension|lateExtensionField2() → core::int;
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField1() → core::int;
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
+static extension-member get Extension|lateExtensionField2() → core::int;
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.transformed.expect
index ddb78d56e25..d2c35b626f2 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_with_initializer.dart.weak.transformed.expect
@@ -116,29 +116,29 @@ static set lateTopLevelField1(core::int lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = 87;
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return let final core::int? #t7 = self::_#Extension|lateExtensionField1 in #t7{core::int};
 }
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = 42;
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return let final core::int? #t8 = self::_#Extension|lateExtensionField2 in #t8{core::int};
 }
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.expect
index 08a2270fa91..4c4649abee6 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.expect
@@ -60,15 +60,15 @@ static get lateTopLevelField() → core::int
   return let final core::int? #t5 = self::_#lateTopLevelField in #t5 == null ?{core::int} throw new _in::LateError::fieldNI("lateTopLevelField") : #t5{core::int};
 static set lateTopLevelField(core::int lateTopLevelField#param) → void
   self::_#lateTopLevelField = lateTopLevelField#param;
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t6 = self::_#Extension|lateExtensionField1 in #t6 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField1") : #t6{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t7 = self::_#Extension|lateExtensionField2 in #t7 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField2") : #t7{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.transformed.expect
index 08a2270fa91..4c4649abee6 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.strong.transformed.expect
@@ -60,15 +60,15 @@ static get lateTopLevelField() → core::int
   return let final core::int? #t5 = self::_#lateTopLevelField in #t5 == null ?{core::int} throw new _in::LateError::fieldNI("lateTopLevelField") : #t5{core::int};
 static set lateTopLevelField(core::int lateTopLevelField#param) → void
   self::_#lateTopLevelField = lateTopLevelField#param;
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t6 = self::_#Extension|lateExtensionField1 in #t6 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField1") : #t6{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t7 = self::_#Extension|lateExtensionField2 in #t7 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField2") : #t7{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.expect
index 8c5d984d440..d9c1d9e01c1 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField1 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t7 = self::_#Extension|lateExtensionField2 in #t7{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.modular.expect
index 8c5d984d440..d9c1d9e01c1 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.modular.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField1 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t7 = self::_#Extension|lateExtensionField2 in #t7{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.outline.expect
index b338f246f13..154ad276a01 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.outline.expect
@@ -45,11 +45,11 @@ static field core::int? _#Extension|lateExtensionField2;
 static field core::bool _#Extension|lateExtensionField2#isSet;
 static get lateTopLevelField() → core::int;
 static set lateTopLevelField(core::int lateTopLevelField#param) → void;
-static get Extension|lateExtensionField1() → core::int;
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
-static get Extension|lateExtensionField2() → core::int;
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField1() → core::int;
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
+static extension-member get Extension|lateExtensionField2() → core::int;
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.transformed.expect
index 8c5d984d440..d9c1d9e01c1 100644
--- a/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_field_without_initializer.dart.weak.transformed.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField1 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t7 = self::_#Extension|lateExtensionField2 in #t7{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
index 33f59de1fb2..1bf00b5078b 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.expect
@@ -98,17 +98,17 @@ static method initLateTopLevelField1(core::int value) → core::int {
 }
 static get lateTopLevelField1() → core::int
   return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11 == null ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1 == null ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateError::fieldADI("lateTopLevelField1") : #t11{core::int};
-static method Extension|initLateExtensionField1(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13 == null ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1 == null ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateError::fieldADI("lateExtensionField1") : #t13{core::int};
-static method Extension|initLateExtensionField2(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15 == null ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2 == null ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateError::fieldADI("lateExtensionField2") : #t15{core::int};
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
index 33f59de1fb2..1bf00b5078b 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.strong.transformed.expect
@@ -98,17 +98,17 @@ static method initLateTopLevelField1(core::int value) → core::int {
 }
 static get lateTopLevelField1() → core::int
   return let final core::int? #t11 = self::_#lateTopLevelField1 in #t11 == null ?{core::int} let final core::int #t12 = self::initLateTopLevelField1(123) in self::_#lateTopLevelField1 == null ?{core::int} self::_#lateTopLevelField1 = #t12 : throw new _in::LateError::fieldADI("lateTopLevelField1") : #t11{core::int};
-static method Extension|initLateExtensionField1(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t13 = self::_#Extension|lateExtensionField1 in #t13 == null ?{core::int} let final core::int #t14 = self::Extension|initLateExtensionField1(87) in self::_#Extension|lateExtensionField1 == null ?{core::int} self::_#Extension|lateExtensionField1 = #t14 : throw new _in::LateError::fieldADI("lateExtensionField1") : #t13{core::int};
-static method Extension|initLateExtensionField2(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t15 = self::_#Extension|lateExtensionField2 in #t15 == null ?{core::int} let final core::int #t16 = self::Extension|initLateExtensionField2(42) in self::_#Extension|lateExtensionField2 == null ?{core::int} self::_#Extension|lateExtensionField2 = #t16 : throw new _in::LateError::fieldADI("lateExtensionField2") : #t15{core::int};
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
index e2d3413507c..9c94bdee9e5 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.expect
@@ -146,10 +146,10 @@ static get lateTopLevelField1() → core::int {
   }
   return let final core::int? #t12 = self::_#lateTopLevelField1 in #t12{core::int};
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int #t13 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -159,10 +159,10 @@ static get Extension|lateExtensionField1() → core::int {
   }
   return let final core::int? #t14 = self::_#Extension|lateExtensionField1 in #t14{core::int};
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int #t15 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -172,7 +172,7 @@ static get Extension|lateExtensionField2() → core::int {
   }
   return let final core::int? #t16 = self::_#Extension|lateExtensionField2 in #t16{core::int};
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.modular.expect
index e2d3413507c..9c94bdee9e5 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.modular.expect
@@ -146,10 +146,10 @@ static get lateTopLevelField1() → core::int {
   }
   return let final core::int? #t12 = self::_#lateTopLevelField1 in #t12{core::int};
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int #t13 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -159,10 +159,10 @@ static get Extension|lateExtensionField1() → core::int {
   }
   return let final core::int? #t14 = self::_#Extension|lateExtensionField1 in #t14{core::int};
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int #t15 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -172,7 +172,7 @@ static get Extension|lateExtensionField2() → core::int {
   }
   return let final core::int? #t16 = self::_#Extension|lateExtensionField2 in #t16{core::int};
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.outline.expect
index fcef73799f7..3532ea1949c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.outline.expect
@@ -74,13 +74,13 @@ static field core::bool _#Extension|lateExtensionField2#isSet;
 static method initLateTopLevelField1(core::int value) → core::int
   ;
 static get lateTopLevelField1() → core::int;
-static method Extension|initLateExtensionField1(core::int value) → core::int
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int
   ;
-static get Extension|lateExtensionField1() → core::int;
-static method Extension|initLateExtensionField2(core::int value) → core::int
+static extension-member get Extension|lateExtensionField1() → core::int;
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int
   ;
-static get Extension|lateExtensionField2() → core::int;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField2() → core::int;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
index e2d3413507c..9c94bdee9e5 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_with_initializer.dart.weak.transformed.expect
@@ -146,10 +146,10 @@ static get lateTopLevelField1() → core::int {
   }
   return let final core::int? #t12 = self::_#lateTopLevelField1 in #t12{core::int};
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int {
+static extension-member get Extension|lateExtensionField1() → core::int {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int #t13 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -159,10 +159,10 @@ static get Extension|lateExtensionField1() → core::int {
   }
   return let final core::int? #t14 = self::_#Extension|lateExtensionField1 in #t14{core::int};
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int {
+static extension-member get Extension|lateExtensionField2() → core::int {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int #t15 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -172,7 +172,7 @@ static get Extension|lateExtensionField2() → core::int {
   }
   return let final core::int? #t16 = self::_#Extension|lateExtensionField2 in #t16{core::int};
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.expect
index 3bd4eedcc22..5305608662e 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.expect
@@ -63,21 +63,21 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void
     self::_#lateTopLevelField = lateTopLevelField#param;
   else
     throw new _in::LateError::fieldAI("lateTopLevelField");
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t5 = self::_#Extension|lateExtensionField1 in #t5 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField1") : #t5{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1 == null)
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   else
     throw new _in::LateError::fieldAI("lateExtensionField1");
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t6 = self::_#Extension|lateExtensionField2 in #t6 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField2") : #t6{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2 == null)
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   else
     throw new _in::LateError::fieldAI("lateExtensionField2");
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.transformed.expect
index 3bd4eedcc22..5305608662e 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.strong.transformed.expect
@@ -63,21 +63,21 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void
     self::_#lateTopLevelField = lateTopLevelField#param;
   else
     throw new _in::LateError::fieldAI("lateTopLevelField");
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return let final core::int? #t5 = self::_#Extension|lateExtensionField1 in #t5 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField1") : #t5{core::int};
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1 == null)
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   else
     throw new _in::LateError::fieldAI("lateExtensionField1");
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return let final core::int? #t6 = self::_#Extension|lateExtensionField2 in #t6 == null ?{core::int} throw new _in::LateError::fieldNI("lateExtensionField2") : #t6{core::int};
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2 == null)
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   else
     throw new _in::LateError::fieldAI("lateExtensionField2");
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.expect
index 461731df8c2..44b39d702c8 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.expect
@@ -79,25 +79,25 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t5 = self::_#Extension|lateExtensionField1 in #t5{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField2 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.modular.expect
index 461731df8c2..44b39d702c8 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.modular.expect
@@ -79,25 +79,25 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t5 = self::_#Extension|lateExtensionField1 in #t5{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField2 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.outline.expect
index 2c3d5d0aa71..91ea042e051 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.outline.expect
@@ -41,11 +41,11 @@ static field core::int? _#Extension|lateExtensionField2;
 static field core::bool _#Extension|lateExtensionField2#isSet;
 static get lateTopLevelField() → core::int;
 static set lateTopLevelField(core::int lateTopLevelField#param) → void;
-static get Extension|lateExtensionField1() → core::int;
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
-static get Extension|lateExtensionField2() → core::int;
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField1() → core::int;
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void;
+static extension-member get Extension|lateExtensionField2() → core::int;
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.transformed.expect
index 461731df8c2..44b39d702c8 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_field_without_initializer.dart.weak.transformed.expect
@@ -79,25 +79,25 @@ static set lateTopLevelField(core::int lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int
+static extension-member get Extension|lateExtensionField1() → core::int
   return self::_#Extension|lateExtensionField1#isSet ?{core::int} let final core::int? #t5 = self::_#Extension|lateExtensionField1 in #t5{core::int} : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int
+static extension-member get Extension|lateExtensionField2() → core::int
   return self::_#Extension|lateExtensionField2#isSet ?{core::int} let final core::int? #t6 = self::_#Extension|lateExtensionField2 in #t6{core::int} : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.expect
index bc4d686572d..6a60d677afd 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.expect
@@ -121,10 +121,10 @@ static get lateTopLevelField1() → core::int? {
   }
   return self::_#lateTopLevelField1;
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int? {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int? #t6 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -134,10 +134,10 @@ static get Extension|lateExtensionField1() → core::int? {
   }
   return self::_#Extension|lateExtensionField1;
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int? {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int? #t7 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -147,7 +147,7 @@ static get Extension|lateExtensionField2() → core::int? {
   }
   return self::_#Extension|lateExtensionField2;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.transformed.expect
index bc4d686572d..6a60d677afd 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.strong.transformed.expect
@@ -121,10 +121,10 @@ static get lateTopLevelField1() → core::int? {
   }
   return self::_#lateTopLevelField1;
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int? {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int? #t6 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -134,10 +134,10 @@ static get Extension|lateExtensionField1() → core::int? {
   }
   return self::_#Extension|lateExtensionField1;
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int? {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int? #t7 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -147,7 +147,7 @@ static get Extension|lateExtensionField2() → core::int? {
   }
   return self::_#Extension|lateExtensionField2;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.expect
index bc4d686572d..6a60d677afd 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.expect
@@ -121,10 +121,10 @@ static get lateTopLevelField1() → core::int? {
   }
   return self::_#lateTopLevelField1;
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int? {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int? #t6 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -134,10 +134,10 @@ static get Extension|lateExtensionField1() → core::int? {
   }
   return self::_#Extension|lateExtensionField1;
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int? {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int? #t7 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -147,7 +147,7 @@ static get Extension|lateExtensionField2() → core::int? {
   }
   return self::_#Extension|lateExtensionField2;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.modular.expect
index bc4d686572d..6a60d677afd 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.modular.expect
@@ -121,10 +121,10 @@ static get lateTopLevelField1() → core::int? {
   }
   return self::_#lateTopLevelField1;
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int? {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int? #t6 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -134,10 +134,10 @@ static get Extension|lateExtensionField1() → core::int? {
   }
   return self::_#Extension|lateExtensionField1;
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int? {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int? #t7 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -147,7 +147,7 @@ static get Extension|lateExtensionField2() → core::int? {
   }
   return self::_#Extension|lateExtensionField2;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.outline.expect
index 2a365eeac1a..a60dd5c511f 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.outline.expect
@@ -60,13 +60,13 @@ static field core::bool _#Extension|lateExtensionField2#isSet;
 static method initLateTopLevelField1(core::int value) → core::int?
   ;
 static get lateTopLevelField1() → core::int?;
-static method Extension|initLateExtensionField1(core::int value) → core::int?
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int?
   ;
-static get Extension|lateExtensionField1() → core::int?;
-static method Extension|initLateExtensionField2(core::int value) → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?;
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int?
   ;
-static get Extension|lateExtensionField2() → core::int?;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField2() → core::int?;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.transformed.expect
index bc4d686572d..6a60d677afd 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_with_initializer.dart.weak.transformed.expect
@@ -121,10 +121,10 @@ static get lateTopLevelField1() → core::int? {
   }
   return self::_#lateTopLevelField1;
 }
-static method Extension|initLateExtensionField1(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField1(core::int value) → core::int? {
   return self::Extension|lateExtensionField1Init = value;
 }
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     final core::int? #t6 = self::Extension|initLateExtensionField1(87);
     if(self::_#Extension|lateExtensionField1#isSet)
@@ -134,10 +134,10 @@ static get Extension|lateExtensionField1() → core::int? {
   }
   return self::_#Extension|lateExtensionField1;
 }
-static method Extension|initLateExtensionField2(core::int value) → core::int? {
+static extension-member method Extension|initLateExtensionField2(core::int value) → core::int? {
   return self::Extension|lateExtensionField2Init = value;
 }
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     final core::int? #t7 = self::Extension|initLateExtensionField2(42);
     if(self::_#Extension|lateExtensionField2#isSet)
@@ -147,7 +147,7 @@ static get Extension|lateExtensionField2() → core::int? {
   }
   return self::_#Extension|lateExtensionField2;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(null, self::Extension|lateExtensionField2Init);
   self::expect(42, self::Extension|lateExtensionField2);
   self::expect(42, self::Extension|lateExtensionField2Init);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.expect
index 9340cfdebb1..3dbd122118c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.expect
@@ -94,25 +94,25 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.transformed.expect
index 9340cfdebb1..3dbd122118c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.strong.transformed.expect
@@ -94,25 +94,25 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.expect
index 9340cfdebb1..3dbd122118c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.expect
@@ -94,25 +94,25 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.modular.expect
index 9340cfdebb1..3dbd122118c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.modular.expect
@@ -94,25 +94,25 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.outline.expect
index e918fab3fa3..773f637ef0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.outline.expect
@@ -45,11 +45,11 @@ static field core::int? _#Extension|lateExtensionField2;
 static field core::bool _#Extension|lateExtensionField2#isSet;
 static get lateTopLevelField() → core::int?;
 static set lateTopLevelField(core::int? lateTopLevelField#param) → void;
-static get Extension|lateExtensionField1() → core::int?;
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
-static get Extension|lateExtensionField2() → core::int?;
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField1() → core::int?;
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
+static extension-member get Extension|lateExtensionField2() → core::int?;
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.transformed.expect
index 9340cfdebb1..3dbd122118c 100644
--- a/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_final_nullable_field_without_initializer.dart.weak.transformed.expect
@@ -94,25 +94,25 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void
     self::_#lateTopLevelField#isSet = true;
     self::_#lateTopLevelField = lateTopLevelField#param;
   }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void
   if(self::_#Extension|lateExtensionField1#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField1");
   else {
     self::_#Extension|lateExtensionField1#isSet = true;
     self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
   }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void
   if(self::_#Extension|lateExtensionField2#isSet)
     throw new _in::LateError::fieldAI("lateExtensionField2");
   else {
     self::_#Extension|lateExtensionField2#isSet = true;
     self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
   }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.expect
index 091e0cabb3c..6f56540ba44 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.expect
@@ -113,33 +113,33 @@ static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   return 87;
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = self::Extension|lateExtensionField1Init();
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return self::_#Extension|lateExtensionField1;
 }
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   return 42;
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = self::Extension|lateExtensionField2Init();
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return self::_#Extension|lateExtensionField2;
 }
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.transformed.expect
index 091e0cabb3c..6f56540ba44 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.strong.transformed.expect
@@ -113,33 +113,33 @@ static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   return 87;
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = self::Extension|lateExtensionField1Init();
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return self::_#Extension|lateExtensionField1;
 }
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   return 42;
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = self::Extension|lateExtensionField2Init();
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return self::_#Extension|lateExtensionField2;
 }
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.expect
index 091e0cabb3c..6f56540ba44 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.expect
@@ -113,33 +113,33 @@ static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   return 87;
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = self::Extension|lateExtensionField1Init();
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return self::_#Extension|lateExtensionField1;
 }
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   return 42;
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = self::Extension|lateExtensionField2Init();
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return self::_#Extension|lateExtensionField2;
 }
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.modular.expect
index 091e0cabb3c..6f56540ba44 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.modular.expect
@@ -113,33 +113,33 @@ static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   return 87;
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = self::Extension|lateExtensionField1Init();
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return self::_#Extension|lateExtensionField1;
 }
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   return 42;
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = self::Extension|lateExtensionField2Init();
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return self::_#Extension|lateExtensionField2;
 }
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.outline.expect
index 9c6d66a2823..155520ad4b7 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.outline.expect
@@ -58,15 +58,15 @@ static method lateTopLevelField1Init() → core::int?
   ;
 static get lateTopLevelField1() → core::int?;
 static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void;
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   ;
-static get Extension|lateExtensionField1() → core::int?;
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?;
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   ;
-static get Extension|lateExtensionField2() → core::int?;
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField2() → core::int?;
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.transformed.expect
index 091e0cabb3c..6f56540ba44 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_with_initializer.dart.weak.transformed.expect
@@ -113,33 +113,33 @@ static set lateTopLevelField1(core::int? lateTopLevelField1#param) → void {
   self::_#lateTopLevelField1#isSet = true;
   self::_#lateTopLevelField1 = lateTopLevelField1#param;
 }
-static method Extension|lateExtensionField1Init() → core::int?
+static extension-member method Extension|lateExtensionField1Init() → core::int?
   return 87;
-static get Extension|lateExtensionField1() → core::int? {
+static extension-member get Extension|lateExtensionField1() → core::int? {
   if(!self::_#Extension|lateExtensionField1#isSet) {
     self::_#Extension|lateExtensionField1 = self::Extension|lateExtensionField1Init();
     self::_#Extension|lateExtensionField1#isSet = true;
   }
   return self::_#Extension|lateExtensionField1;
 }
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static method Extension|lateExtensionField2Init() → core::int?
+static extension-member method Extension|lateExtensionField2Init() → core::int?
   return 42;
-static get Extension|lateExtensionField2() → core::int? {
+static extension-member get Extension|lateExtensionField2() → core::int? {
   if(!self::_#Extension|lateExtensionField2#isSet) {
     self::_#Extension|lateExtensionField2 = self::Extension|lateExtensionField2Init();
     self::_#Extension|lateExtensionField2#isSet = true;
   }
   return self::_#Extension|lateExtensionField2;
 }
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::expect(42, self::Extension|lateExtensionField2);
   self::Extension|lateExtensionField2 = 43;
   self::expect(43, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.expect
index c90b28724c3..7f72f243a0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.transformed.expect
index c90b28724c3..7f72f243a0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.strong.transformed.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.expect
index c90b28724c3..7f72f243a0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.modular.expect
index c90b28724c3..7f72f243a0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.modular.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.outline.expect
index 1e56729ad5d..5b8283c859f 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.outline.expect
@@ -45,11 +45,11 @@ static field core::int? _#Extension|lateExtensionField2;
 static field core::bool _#Extension|lateExtensionField2#isSet;
 static get lateTopLevelField() → core::int?;
 static set lateTopLevelField(core::int? lateTopLevelField#param) → void;
-static get Extension|lateExtensionField1() → core::int?;
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
-static get Extension|lateExtensionField2() → core::int?;
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
-static method Extension|staticMethod() → dynamic
+static extension-member get Extension|lateExtensionField1() → core::int?;
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void;
+static extension-member get Extension|lateExtensionField2() → core::int?;
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void;
+static extension-member method Extension|staticMethod() → dynamic
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.transformed.expect
index c90b28724c3..7f72f243a0a 100644
--- a/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/late_nullable_field_without_initializer.dart.weak.transformed.expect
@@ -76,19 +76,19 @@ static set lateTopLevelField(core::int? lateTopLevelField#param) → void {
   self::_#lateTopLevelField#isSet = true;
   self::_#lateTopLevelField = lateTopLevelField#param;
 }
-static get Extension|lateExtensionField1() → core::int?
+static extension-member get Extension|lateExtensionField1() → core::int?
   return self::_#Extension|lateExtensionField1#isSet ?{core::int?} self::_#Extension|lateExtensionField1 : throw new _in::LateError::fieldNI("lateExtensionField1");
-static set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
+static extension-member set Extension|lateExtensionField1(core::int? lateExtensionField1#param) → void {
   self::_#Extension|lateExtensionField1#isSet = true;
   self::_#Extension|lateExtensionField1 = lateExtensionField1#param;
 }
-static get Extension|lateExtensionField2() → core::int?
+static extension-member get Extension|lateExtensionField2() → core::int?
   return self::_#Extension|lateExtensionField2#isSet ?{core::int?} self::_#Extension|lateExtensionField2 : throw new _in::LateError::fieldNI("lateExtensionField2");
-static set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
+static extension-member set Extension|lateExtensionField2(core::int? lateExtensionField2#param) → void {
   self::_#Extension|lateExtensionField2#isSet = true;
   self::_#Extension|lateExtensionField2 = lateExtensionField2#param;
 }
-static method Extension|staticMethod() → dynamic {
+static extension-member method Extension|staticMethod() → dynamic {
   self::throws(() → core::int? => self::Extension|lateExtensionField2, "Read value from uninitialized Class.lateExtensionField2");
   self::Extension|lateExtensionField2 = 42;
   self::expect(42, self::Extension|lateExtensionField2);
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.strong.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.strong.expect
index 235a6d329d9..f4e64f8c17c 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.strong.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.strong.expect
@@ -77,33 +77,33 @@ static method main() → dynamic {
   self::_Extension|_privateFinalField1;
   self::_Extension|_privateFinalField2;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int
   return let final core::int? #t3 = self::_#_Extension|_privateField1 in #t3 == null ?{core::int} self::_#_Extension|_privateField1 = 1 : #t3{core::int};
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void
   self::_#_Extension|_privateField1 = _privateField1#param;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
   if(!self::_#_Extension|_privateField2#isSet) {
     self::_#_Extension|_privateField2 = 1;
     self::_#_Extension|_privateField2#isSet = true;
   }
   return self::_#_Extension|_privateField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
   self::_#_Extension|_privateField2#isSet = true;
   self::_#_Extension|_privateField2 = _privateField2#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int
   return let final core::int? #t4 = self::_#_Extension|_privateFinalField1 in #t4 == null ?{core::int} self::_#_Extension|_privateFinalField1 = 1 : #t4{core::int};
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void
   self::_#_Extension|_privateFinalField1 = _privateFinalField1#param;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
   if(!self::_#_Extension|_privateFinalField2#isSet) {
     self::_#_Extension|_privateFinalField2 = 1;
     self::_#_Extension|_privateFinalField2#isSet = true;
   }
   return self::_#_Extension|_privateFinalField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
   self::_#_Extension|_privateFinalField2#isSet = true;
   self::_#_Extension|_privateFinalField2 = _privateFinalField2#param;
 }
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.strong.transformed.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.strong.transformed.expect
index 235a6d329d9..f4e64f8c17c 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.strong.transformed.expect
@@ -77,33 +77,33 @@ static method main() → dynamic {
   self::_Extension|_privateFinalField1;
   self::_Extension|_privateFinalField2;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int
   return let final core::int? #t3 = self::_#_Extension|_privateField1 in #t3 == null ?{core::int} self::_#_Extension|_privateField1 = 1 : #t3{core::int};
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void
   self::_#_Extension|_privateField1 = _privateField1#param;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
   if(!self::_#_Extension|_privateField2#isSet) {
     self::_#_Extension|_privateField2 = 1;
     self::_#_Extension|_privateField2#isSet = true;
   }
   return self::_#_Extension|_privateField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
   self::_#_Extension|_privateField2#isSet = true;
   self::_#_Extension|_privateField2 = _privateField2#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int
   return let final core::int? #t4 = self::_#_Extension|_privateFinalField1 in #t4 == null ?{core::int} self::_#_Extension|_privateFinalField1 = 1 : #t4{core::int};
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void
   self::_#_Extension|_privateFinalField1 = _privateFinalField1#param;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
   if(!self::_#_Extension|_privateFinalField2#isSet) {
     self::_#_Extension|_privateFinalField2 = 1;
     self::_#_Extension|_privateFinalField2#isSet = true;
   }
   return self::_#_Extension|_privateFinalField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
   self::_#_Extension|_privateFinalField2#isSet = true;
   self::_#_Extension|_privateFinalField2 = _privateFinalField2#param;
 }
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.expect
index 769d4aab63d..92589ba062a 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.expect
@@ -97,47 +97,47 @@ static method main() → dynamic {
   self::_Extension|_privateFinalField1;
   self::_Extension|_privateFinalField2;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
   if(!self::_#_Extension|_privateField1#isSet) {
     self::_#_Extension|_privateField1 = 1;
     self::_#_Extension|_privateField1#isSet = true;
   }
   return let final core::int? #t3 = self::_#_Extension|_privateField1 in #t3{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
   self::_#_Extension|_privateField1#isSet = true;
   self::_#_Extension|_privateField1 = _privateField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
   if(!self::_#_Extension|_privateField2#isSet) {
     self::_#_Extension|_privateField2 = 1;
     self::_#_Extension|_privateField2#isSet = true;
   }
   return self::_#_Extension|_privateField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
   self::_#_Extension|_privateField2#isSet = true;
   self::_#_Extension|_privateField2 = _privateField2#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
   if(!self::_#_Extension|_privateFinalField1#isSet) {
     self::_#_Extension|_privateFinalField1 = 1;
     self::_#_Extension|_privateFinalField1#isSet = true;
   }
   return let final core::int? #t4 = self::_#_Extension|_privateFinalField1 in #t4{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
   self::_#_Extension|_privateFinalField1#isSet = true;
   self::_#_Extension|_privateFinalField1 = _privateFinalField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
   if(!self::_#_Extension|_privateFinalField2#isSet) {
     self::_#_Extension|_privateFinalField2 = 1;
     self::_#_Extension|_privateFinalField2#isSet = true;
   }
   return self::_#_Extension|_privateFinalField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
   self::_#_Extension|_privateFinalField2#isSet = true;
   self::_#_Extension|_privateFinalField2 = _privateFinalField2#param;
 }
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.modular.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.modular.expect
index 769d4aab63d..92589ba062a 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.modular.expect
@@ -97,47 +97,47 @@ static method main() → dynamic {
   self::_Extension|_privateFinalField1;
   self::_Extension|_privateFinalField2;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
   if(!self::_#_Extension|_privateField1#isSet) {
     self::_#_Extension|_privateField1 = 1;
     self::_#_Extension|_privateField1#isSet = true;
   }
   return let final core::int? #t3 = self::_#_Extension|_privateField1 in #t3{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
   self::_#_Extension|_privateField1#isSet = true;
   self::_#_Extension|_privateField1 = _privateField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
   if(!self::_#_Extension|_privateField2#isSet) {
     self::_#_Extension|_privateField2 = 1;
     self::_#_Extension|_privateField2#isSet = true;
   }
   return self::_#_Extension|_privateField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
   self::_#_Extension|_privateField2#isSet = true;
   self::_#_Extension|_privateField2 = _privateField2#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
   if(!self::_#_Extension|_privateFinalField1#isSet) {
     self::_#_Extension|_privateFinalField1 = 1;
     self::_#_Extension|_privateFinalField1#isSet = true;
   }
   return let final core::int? #t4 = self::_#_Extension|_privateFinalField1 in #t4{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
   self::_#_Extension|_privateFinalField1#isSet = true;
   self::_#_Extension|_privateFinalField1 = _privateFinalField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
   if(!self::_#_Extension|_privateFinalField2#isSet) {
     self::_#_Extension|_privateFinalField2 = 1;
     self::_#_Extension|_privateFinalField2#isSet = true;
   }
   return self::_#_Extension|_privateFinalField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
   self::_#_Extension|_privateFinalField2#isSet = true;
   self::_#_Extension|_privateFinalField2 = _privateFinalField2#param;
 }
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.outline.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.outline.expect
index 69bf35fb2a2..6cd8e45c030 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.outline.expect
@@ -51,11 +51,11 @@ static field core::int? _#_Extension|_privateFinalField2 /* from org-dartlang-te
 static field core::bool _#_Extension|_privateFinalField2#isSet /* from org-dartlang-testcase:///private_members_part.dart */;
 static method main() → dynamic
   ;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int;
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int?;
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int;
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void;
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int?;
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void;
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int;
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void;
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int?;
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void;
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int;
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void;
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int?;
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void;
diff --git a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.transformed.expect b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.transformed.expect
index 769d4aab63d..92589ba062a 100644
--- a/pkg/front_end/testcases/late_lowering/private_members.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/late_lowering/private_members.dart.weak.transformed.expect
@@ -97,47 +97,47 @@ static method main() → dynamic {
   self::_Extension|_privateFinalField1;
   self::_Extension|_privateFinalField2;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1() → core::int {
   if(!self::_#_Extension|_privateField1#isSet) {
     self::_#_Extension|_privateField1 = 1;
     self::_#_Extension|_privateField1#isSet = true;
   }
   return let final core::int? #t3 = self::_#_Extension|_privateField1 in #t3{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField1(core::int _privateField1#param) → void {
   self::_#_Extension|_privateField1#isSet = true;
   self::_#_Extension|_privateField1 = _privateField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2() → core::int? {
   if(!self::_#_Extension|_privateField2#isSet) {
     self::_#_Extension|_privateField2 = 1;
     self::_#_Extension|_privateField2#isSet = true;
   }
   return self::_#_Extension|_privateField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateField2(core::int? _privateField2#param) → void {
   self::_#_Extension|_privateField2#isSet = true;
   self::_#_Extension|_privateField2 = _privateField2#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1() → core::int {
   if(!self::_#_Extension|_privateFinalField1#isSet) {
     self::_#_Extension|_privateFinalField1 = 1;
     self::_#_Extension|_privateFinalField1#isSet = true;
   }
   return let final core::int? #t4 = self::_#_Extension|_privateFinalField1 in #t4{core::int};
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField1(core::int _privateFinalField1#param) → void {
   self::_#_Extension|_privateFinalField1#isSet = true;
   self::_#_Extension|_privateFinalField1 = _privateFinalField1#param;
 }
-static get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
+static extension-member get /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2() → core::int? {
   if(!self::_#_Extension|_privateFinalField2#isSet) {
     self::_#_Extension|_privateFinalField2 = 1;
     self::_#_Extension|_privateFinalField2#isSet = true;
   }
   return self::_#_Extension|_privateFinalField2;
 }
-static set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
+static extension-member set /* from org-dartlang-testcase:///private_members_part.dart */ _Extension|_privateFinalField2(core::int? _privateFinalField2#param) → void {
   self::_#_Extension|_privateFinalField2#isSet = true;
   self::_#_Extension|_privateFinalField2 = _privateFinalField2#param;
 }
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.strong.expect b/pkg/front_end/testcases/macros/extension_scope.dart.strong.expect
index 15a55aac2da..b1426b7137a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.strong.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.strong.expect
@@ -221,17 +221,17 @@ static method _method(ext::Class c) → void {
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -247,17 +247,17 @@ static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -273,15 +273,15 @@ static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.strong.transformed.expect b/pkg/front_end/testcases/macros/extension_scope.dart.strong.transformed.expect
index 15a55aac2da..b1426b7137a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.strong.transformed.expect
@@ -221,17 +221,17 @@ static method _method(ext::Class c) → void {
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -247,17 +247,17 @@ static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -273,15 +273,15 @@ static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.weak.expect b/pkg/front_end/testcases/macros/extension_scope.dart.weak.expect
index 15a55aac2da..b1426b7137a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.weak.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.weak.expect
@@ -221,17 +221,17 @@ static method _method(ext::Class c) → void {
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -247,17 +247,17 @@ static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -273,15 +273,15 @@ static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.weak.modular.expect b/pkg/front_end/testcases/macros/extension_scope.dart.weak.modular.expect
index 15a55aac2da..b1426b7137a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.weak.modular.expect
@@ -221,17 +221,17 @@ static method _method(ext::Class c) → void {
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -247,17 +247,17 @@ static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -273,15 +273,15 @@ static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.weak.outline.expect b/pkg/front_end/testcases/macros/extension_scope.dart.weak.outline.expect
index 0aedd491dcc..f18eeaa7a4a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.weak.outline.expect
@@ -66,55 +66,55 @@ extension /* unnamed */ _extension#5 on ext::Class {
 }
 static method _method(ext::Class c) → void
   ;
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void
   ;
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void
   ;
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void
   ;
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void
   ;
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void
   ;
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/macros/extension_scope.dart.weak.transformed.expect b/pkg/front_end/testcases/macros/extension_scope.dart.weak.transformed.expect
index 15a55aac2da..b1426b7137a 100644
--- a/pkg/front_end/testcases/macros/extension_scope.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/macros/extension_scope.dart.weak.transformed.expect
@@ -221,17 +221,17 @@ static method _method(ext::Class c) → void {
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|namedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#namedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|namedExtensionMethod(#this);
-static method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method Extension|_namedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method Extension|get#_namedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::Extension|_namedExtensionPrivateMethod(#this);
-static method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|unnamedExtensionMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#unnamedExtensionMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|unnamedExtensionMethod(#this);
-static method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
-static method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
+static extension-member method _extension#5|_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → void {}
+static extension-member method _extension#5|get#_unnamedExtensionPrivateMethod(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#5|_unnamedExtensionPrivateMethod(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _method1(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -247,17 +247,17 @@ static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|namedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#namedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|namedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ NamedInjectedExtension1|get#_namedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension1|_namedInjectedExtensionPrivateMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#unnamedInjectedExtensionMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|unnamedInjectedExtensionMethod1(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib1.dart */ _extension#1|get#_unnamedInjectedExtensionPrivateMethod1(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#1|_unnamedInjectedExtensionPrivateMethod1(#this);
 static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _method2(ext::Class c) → void {
   ext::Extension|namedExtensionMethod(c);
@@ -273,15 +273,15 @@ static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _met
   ext::_extension#3|unnamedInjectedExtensionMethod2(c);
   ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(c);
 }
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|namedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#namedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|namedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ NamedInjectedExtension2|get#_namedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::NamedInjectedExtension2|_namedInjectedExtensionPrivateMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#unnamedInjectedExtensionMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|unnamedInjectedExtensionMethod2(#this);
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
-static method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → void {}
+static extension-member method /* from org-dartlang-testcase:///extension_scope_lib2.dart */ _extension#3|get#_unnamedInjectedExtensionPrivateMethod2(lowered final ext::Class #this) → () → void
   return () → void => ext::_extension#3|_unnamedInjectedExtensionPrivateMethod2(#this);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.expect
index 354c74c3e1e..03e600edff9 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.expect
@@ -31,16 +31,16 @@ extension E on self::A {
   static method staticMethod2 = self::E|staticMethod2;
 }
 static method foo(core::int x, core::int y, {required core::int z = #C1}) → dynamic {}
-static method E|method1(lowered final self::A #this) → dynamic {
+static extension-member method E|method1(lowered final self::A #this) → dynamic {
   let final self::A #t4 = #this in let final core::int #t5 = 1 in self::E|method2(#t4, 2, foo: #t5);
   let final core::int #t6 = 1 in self::E|staticMethod2(2, foo: #t6);
 }
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo = #C1}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
 static method test(dynamic d, core::Function f, self::A a) → dynamic {
   function local(core::int x, core::int y, {required core::int z = #C1}) → void {}
   self::foo(1, 2, z: 3);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.transformed.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.transformed.expect
index 53cf63e3fd8..5928227b04c 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.strong.transformed.expect
@@ -31,16 +31,16 @@ extension E on self::A {
   static method staticMethod2 = self::E|staticMethod2;
 }
 static method foo(core::int x, core::int y, {required core::int z = #C1}) → dynamic {}
-static method E|method1(lowered final self::A #this) → dynamic {
+static extension-member method E|method1(lowered final self::A #this) → dynamic {
   let final self::A #t4 = #this in let final core::int #t5 = 1 in self::E|method2(#t4, 2, foo: #t5);
   let final core::int #t6 = 1 in self::E|staticMethod2(2, foo: #t6);
 }
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo = #C1}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
 static method test(dynamic d, core::Function f, self::A a) → dynamic {
   function local(core::int x, core::int y, {required core::int z = #C1}) → void {}
   self::foo(1, 2, z: 3);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.expect
index 354c74c3e1e..03e600edff9 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.expect
@@ -31,16 +31,16 @@ extension E on self::A {
   static method staticMethod2 = self::E|staticMethod2;
 }
 static method foo(core::int x, core::int y, {required core::int z = #C1}) → dynamic {}
-static method E|method1(lowered final self::A #this) → dynamic {
+static extension-member method E|method1(lowered final self::A #this) → dynamic {
   let final self::A #t4 = #this in let final core::int #t5 = 1 in self::E|method2(#t4, 2, foo: #t5);
   let final core::int #t6 = 1 in self::E|staticMethod2(2, foo: #t6);
 }
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo = #C1}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
 static method test(dynamic d, core::Function f, self::A a) → dynamic {
   function local(core::int x, core::int y, {required core::int z = #C1}) → void {}
   self::foo(1, 2, z: 3);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.modular.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.modular.expect
index 354c74c3e1e..03e600edff9 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.modular.expect
@@ -31,16 +31,16 @@ extension E on self::A {
   static method staticMethod2 = self::E|staticMethod2;
 }
 static method foo(core::int x, core::int y, {required core::int z = #C1}) → dynamic {}
-static method E|method1(lowered final self::A #this) → dynamic {
+static extension-member method E|method1(lowered final self::A #this) → dynamic {
   let final self::A #t4 = #this in let final core::int #t5 = 1 in self::E|method2(#t4, 2, foo: #t5);
   let final core::int #t6 = 1 in self::E|staticMethod2(2, foo: #t6);
 }
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo = #C1}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
 static method test(dynamic d, core::Function f, self::A a) → dynamic {
   function local(core::int x, core::int y, {required core::int z = #C1}) → void {}
   self::foo(1, 2, z: 3);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.outline.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.outline.expect
index 431fc9dca87..33b70dfb4ef 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.outline.expect
@@ -28,15 +28,15 @@ extension E on self::A {
 }
 static method foo(core::int x, core::int y, {required core::int z}) → dynamic
   ;
-static method E|method1(lowered final self::A #this) → dynamic
+static extension-member method E|method1(lowered final self::A #this) → dynamic
   ;
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo}) → dynamic
   ;
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo}) → dynamic
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo}) → dynamic
   ;
 static method test(dynamic d, core::Function f, self::A a) → dynamic
   ;
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.transformed.expect b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.transformed.expect
index 53cf63e3fd8..5928227b04c 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/all_kinds.dart.weak.transformed.expect
@@ -31,16 +31,16 @@ extension E on self::A {
   static method staticMethod2 = self::E|staticMethod2;
 }
 static method foo(core::int x, core::int y, {required core::int z = #C1}) → dynamic {}
-static method E|method1(lowered final self::A #this) → dynamic {
+static extension-member method E|method1(lowered final self::A #this) → dynamic {
   let final self::A #t4 = #this in let final core::int #t5 = 1 in self::E|method2(#t4, 2, foo: #t5);
   let final core::int #t6 = 1 in self::E|staticMethod2(2, foo: #t6);
 }
-static method E|get#method1(lowered final self::A #this) → () → dynamic
+static extension-member method E|get#method1(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::E|method1(#this);
-static method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
-static method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
+static extension-member method E|method2(lowered final self::A #this, core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|get#method2(lowered final self::A #this) → (core::int, {foo: core::int?}) → dynamic
   return (core::int bar, {core::int? foo = #C1}) → dynamic => self::E|method2(#this, bar, foo: foo);
-static method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
+static extension-member method E|staticMethod2(core::int bar, {core::int? foo = #C1}) → dynamic {}
 static method test(dynamic d, core::Function f, self::A a) → dynamic {
   function local(core::int x, core::int y, {required core::int z = #C1}) → void {}
   self::foo(1, 2, z: 3);
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.expect
index 5d3df89f0ca..a807eecea81 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.expect
@@ -13,7 +13,7 @@ extension SuetaExtension on self::Sueta {
 }
 static method main(core::List<core::String> arguments) → void {}
 static method test(core::int positional, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
-static method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
+static extension-member method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
 static method test1() → void {
   let final core::int #t1 = 0 in self::test(1, named1: #t1, named2: 0);
 }
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.transformed.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.transformed.expect
index 40204af73b2..eee457005bc 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.strong.transformed.expect
@@ -13,7 +13,7 @@ extension SuetaExtension on self::Sueta {
 }
 static method main(core::List<core::String> arguments) → void {}
 static method test(core::int positional, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
-static method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
+static extension-member method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
 static method test1() → void {
   let final core::int #t1 = 0 in self::test(1, named1: #t1, named2: 0);
 }
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.expect
index 5d3df89f0ca..a807eecea81 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.expect
@@ -13,7 +13,7 @@ extension SuetaExtension on self::Sueta {
 }
 static method main(core::List<core::String> arguments) → void {}
 static method test(core::int positional, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
-static method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
+static extension-member method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
 static method test1() → void {
   let final core::int #t1 = 0 in self::test(1, named1: #t1, named2: 0);
 }
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.modular.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.modular.expect
index 5d3df89f0ca..a807eecea81 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.modular.expect
@@ -13,7 +13,7 @@ extension SuetaExtension on self::Sueta {
 }
 static method main(core::List<core::String> arguments) → void {}
 static method test(core::int positional, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
-static method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
+static extension-member method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
 static method test1() → void {
   let final core::int #t1 = 0 in self::test(1, named1: #t1, named2: 0);
 }
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.outline.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.outline.expect
index 932f994f0bf..5f0435e9043 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.outline.expect
@@ -15,7 +15,7 @@ static method main(core::List<core::String> arguments) → void
   ;
 static method test(core::int positional, {has-declared-initializer core::int named1, has-declared-initializer core::int named2}) → void
   ;
-static method SuetaExtension|test(core::int pos, {has-declared-initializer core::int named1, has-declared-initializer core::int named2}) → void
+static extension-member method SuetaExtension|test(core::int pos, {has-declared-initializer core::int named1, has-declared-initializer core::int named2}) → void
   ;
 static method test1() → void
   ;
diff --git a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.transformed.expect b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.transformed.expect
index 40204af73b2..eee457005bc 100644
--- a/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/named_arguments_anywhere/issue50910.dart.weak.transformed.expect
@@ -13,7 +13,7 @@ extension SuetaExtension on self::Sueta {
 }
 static method main(core::List<core::String> arguments) → void {}
 static method test(core::int positional, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
-static method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
+static extension-member method SuetaExtension|test(core::int pos, {core::int named1 = #C1, core::int named2 = #C1}) → void {}
 static method test1() → void {
   let final core::int #t1 = 0 in self::test(1, named1: #t1, named2: 0);
 }
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.expect
index d025433848e..d2f5cd7a647 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.expect
@@ -238,9 +238,9 @@ static final field core::int finalTopLevelField = 0;
 static const field core::int constField = #C1;
 static field core::int Extension|extensionStaticField = 0;
 static final field core::int Extension|finalExtensionStaticField = 0;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.transformed.expect
index d025433848e..d2f5cd7a647 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.strong.transformed.expect
@@ -238,9 +238,9 @@ static final field core::int finalTopLevelField = 0;
 static const field core::int constField = #C1;
 static field core::int Extension|extensionStaticField = 0;
 static final field core::int Extension|finalExtensionStaticField = 0;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.expect
index d025433848e..d2f5cd7a647 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.expect
@@ -238,9 +238,9 @@ static final field core::int finalTopLevelField = 0;
 static const field core::int constField = #C1;
 static field core::int Extension|extensionStaticField = 0;
 static final field core::int Extension|finalExtensionStaticField = 0;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.modular.expect
index d025433848e..d2f5cd7a647 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.modular.expect
@@ -238,9 +238,9 @@ static final field core::int finalTopLevelField = 0;
 static const field core::int constField = #C1;
 static field core::int Extension|extensionStaticField = 0;
 static final field core::int Extension|finalExtensionStaticField = 0;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.outline.expect
index d0395a30d8c..8db38c6acb8 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.outline.expect
@@ -206,8 +206,8 @@ static final field core::int finalTopLevelField;
 static const field core::int constField = 0;
 static field core::int Extension|extensionStaticField;
 static final field core::int Extension|finalExtensionStaticField;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.transformed.expect
index d025433848e..d2f5cd7a647 100644
--- a/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/abstract_field_errors.dart.weak.transformed.expect
@@ -238,9 +238,9 @@ static final field core::int finalTopLevelField = 0;
 static const field core::int constField = #C1;
 static field core::int Extension|extensionStaticField = 0;
 static final field core::int Extension|finalExtensionStaticField = 0;
-static abstract get Extension|extensionInstanceField() → core::int;
-static abstract set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
-static abstract get Extension|finalExtensionInstanceField() → core::int;
+static abstract extension-member get Extension|extensionInstanceField() → core::int;
+static abstract extension-member set Extension|extensionInstanceField(core::int #externalFieldValue) → void;
+static abstract extension-member get Extension|finalExtensionInstanceField() → core::int;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.expect
index 8a75895c454..3f609faf242 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.expect
@@ -291,37 +291,37 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter = 1;
 static final field core::int Extension|instanceFieldAndDuplicateSetter = 1;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   return 1;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
   self::result = 1;
 }
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic {
   core::int c = 0;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.transformed.expect
index 8a75895c454..3f609faf242 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.strong.transformed.expect
@@ -291,37 +291,37 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter = 1;
 static final field core::int Extension|instanceFieldAndDuplicateSetter = 1;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   return 1;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
   self::result = 1;
 }
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic {
   core::int c = 0;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.expect
index 8a75895c454..3f609faf242 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.expect
@@ -291,37 +291,37 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter = 1;
 static final field core::int Extension|instanceFieldAndDuplicateSetter = 1;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   return 1;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
   self::result = 1;
 }
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic {
   core::int c = 0;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.modular.expect
index 8a75895c454..3f609faf242 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.modular.expect
@@ -291,37 +291,37 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter = 1;
 static final field core::int Extension|instanceFieldAndDuplicateSetter = 1;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   return 1;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
   self::result = 1;
 }
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic {
   core::int c = 0;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.outline.expect
index 96c63670679..b8815650583 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.outline.expect
@@ -196,31 +196,31 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter;
 static final field core::int Extension|instanceFieldAndDuplicateSetter;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   ;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   ;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void
   ;
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   ;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void
   ;
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   ;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.transformed.expect
index 8a75895c454..3f609faf242 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_instance_extension.dart.weak.transformed.expect
@@ -291,37 +291,37 @@ late static final [setter] field core::int Extension|instanceLateFinalFieldAndSe
 static final field core::int Extension|instanceDuplicateFieldAndSetter = 1;
 static final field core::int Extension|instanceFieldAndDuplicateSetter = 1;
 static final field core::int Extension|instanceDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|instanceMethod(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethod(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethod(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethod(#this);
-static method Extension|get#instanceGetter(lowered final core::int #this) → core::int
+static extension-member method Extension|get#instanceGetter(lowered final core::int #this) → core::int
   return 1;
-static method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
+static extension-member method Extension|set#instanceSetter(lowered final core::int #this, dynamic value) → void {
   self::result = 1;
 }
-static method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceDuplicateFieldAndDuplicateSetter(lowered final core::int #this, core::int value) → void {
   self::result = 3;
 }
-static method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter1(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter1(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter1(#this);
-static method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter1(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
+static extension-member method Extension|set#instanceMethodAndSetter2(lowered final core::int #this, core::int value) → void {
   self::result = 2;
 }
-static method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
+static extension-member method Extension|instanceMethodAndSetter2(lowered final core::int #this) → core::int
   return 1;
-static method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
+static extension-member method Extension|get#instanceMethodAndSetter2(lowered final core::int #this) → () → core::int
   return () → core::int => self::Extension|instanceMethodAndSetter2(#this);
 static method test() → dynamic {
   core::int c = 0;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.expect
index b8abf8c3e0e..79f6ac6e779 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.expect
@@ -206,31 +206,31 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter = 1;
 static final field core::int Extension|staticFieldAndDuplicateSetter = 1;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return 1;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   return 1;
-static set Extension|staticSetter(dynamic value) → void {
+static extension-member set Extension|staticSetter(dynamic value) → void {
   self::result = 1;
 }
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
   self::result = 3;
 }
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
   self::result = 3;
 }
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   return 1;
-static set Extension|staticMethodAndSetter1(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticMethodAndSetter2(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void {
   self::result = 2;
 }
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   return 1;
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/duplicates_static_extension.dart:85:13: Error: Can't use 'staticMethod' because it is declared more than once.
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.transformed.expect
index b8abf8c3e0e..79f6ac6e779 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.strong.transformed.expect
@@ -206,31 +206,31 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter = 1;
 static final field core::int Extension|staticFieldAndDuplicateSetter = 1;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return 1;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   return 1;
-static set Extension|staticSetter(dynamic value) → void {
+static extension-member set Extension|staticSetter(dynamic value) → void {
   self::result = 1;
 }
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
   self::result = 3;
 }
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
   self::result = 3;
 }
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   return 1;
-static set Extension|staticMethodAndSetter1(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticMethodAndSetter2(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void {
   self::result = 2;
 }
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   return 1;
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/duplicates_static_extension.dart:85:13: Error: Can't use 'staticMethod' because it is declared more than once.
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.expect
index b8abf8c3e0e..79f6ac6e779 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.expect
@@ -206,31 +206,31 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter = 1;
 static final field core::int Extension|staticFieldAndDuplicateSetter = 1;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return 1;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   return 1;
-static set Extension|staticSetter(dynamic value) → void {
+static extension-member set Extension|staticSetter(dynamic value) → void {
   self::result = 1;
 }
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
   self::result = 3;
 }
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
   self::result = 3;
 }
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   return 1;
-static set Extension|staticMethodAndSetter1(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticMethodAndSetter2(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void {
   self::result = 2;
 }
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   return 1;
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/duplicates_static_extension.dart:85:13: Error: Can't use 'staticMethod' because it is declared more than once.
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.modular.expect
index b8abf8c3e0e..79f6ac6e779 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.modular.expect
@@ -206,31 +206,31 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter = 1;
 static final field core::int Extension|staticFieldAndDuplicateSetter = 1;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return 1;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   return 1;
-static set Extension|staticSetter(dynamic value) → void {
+static extension-member set Extension|staticSetter(dynamic value) → void {
   self::result = 1;
 }
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
   self::result = 3;
 }
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
   self::result = 3;
 }
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   return 1;
-static set Extension|staticMethodAndSetter1(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticMethodAndSetter2(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void {
   self::result = 2;
 }
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   return 1;
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/duplicates_static_extension.dart:85:13: Error: Can't use 'staticMethod' because it is declared more than once.
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.outline.expect
index c5ef2586f72..3602c202145 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.outline.expect
@@ -138,25 +138,25 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter;
 static final field core::int Extension|staticFieldAndDuplicateSetter;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   ;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   ;
-static set Extension|staticSetter(dynamic value) → void
+static extension-member set Extension|staticSetter(dynamic value) → void
   ;
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void
   ;
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void
   ;
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void
   ;
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   ;
-static set Extension|staticMethodAndSetter1(core::int value) → void
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void
   ;
-static set Extension|staticMethodAndSetter2(core::int value) → void
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void
   ;
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   ;
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.transformed.expect
index b8abf8c3e0e..79f6ac6e779 100644
--- a/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/duplicates_static_extension.dart.weak.transformed.expect
@@ -206,31 +206,31 @@ late static final [setter] field core::int Extension|staticLateFinalFieldAndSett
 static final field core::int Extension|staticDuplicateFieldAndSetter = 1;
 static final field core::int Extension|staticFieldAndDuplicateSetter = 1;
 static final field core::int Extension|staticDuplicateFieldAndDuplicateSetter = 1;
-static method Extension|staticMethod() → core::int
+static extension-member method Extension|staticMethod() → core::int
   return 1;
-static get Extension|staticGetter() → core::int
+static extension-member get Extension|staticGetter() → core::int
   return 1;
-static set Extension|staticSetter(dynamic value) → void {
+static extension-member set Extension|staticSetter(dynamic value) → void {
   self::result = 1;
 }
-static set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndSetter(core::int value) → void {
   self::result = 3;
 }
-static set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticFieldAndDuplicateSetter(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
+static extension-member set Extension|staticDuplicateFieldAndDuplicateSetter(core::int value) → void {
   self::result = 3;
 }
-static method Extension|staticMethodAndSetter1() → core::int
+static extension-member method Extension|staticMethodAndSetter1() → core::int
   return 1;
-static set Extension|staticMethodAndSetter1(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter1(core::int value) → void {
   self::result = 2;
 }
-static set Extension|staticMethodAndSetter2(core::int value) → void {
+static extension-member set Extension|staticMethodAndSetter2(core::int value) → void {
   self::result = 2;
 }
-static method Extension|staticMethodAndSetter2() → core::int
+static extension-member method Extension|staticMethodAndSetter2() → core::int
   return 1;
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/duplicates_static_extension.dart:85:13: Error: Can't use 'staticMethod' because it is declared more than once.
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.expect
index 641e09479b5..82887665820 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.expect
@@ -62,79 +62,79 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.transformed.expect
index 641e09479b5..82887665820 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.strong.transformed.expect
@@ -62,79 +62,79 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.expect
index 641e09479b5..82887665820 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.expect
@@ -62,79 +62,79 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.modular.expect
index 641e09479b5..82887665820 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.modular.expect
@@ -62,79 +62,79 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.outline.expect
index 3c7573b46ca..75d02fdb941 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.outline.expect
@@ -62,105 +62,105 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic
   ;
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic
   ;
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic
   ;
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic
   ;
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic
   ;
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic
   ;
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic
   ;
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic
   ;
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic
   ;
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic
   ;
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic
   ;
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic
   ;
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic
   ;
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic
   ;
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic
   ;
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic
   ;
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic
   ;
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic
   ;
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic
   ;
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic
   ;
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic
   ;
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic
   ;
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic
   ;
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic
   ;
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic
   ;
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.transformed.expect
index 641e09479b5..82887665820 100644
--- a/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_bounds.dart.weak.transformed.expect
@@ -62,79 +62,79 @@ extension Extension5<T extends core::Object?> on T% {
   method method5 = self::Extension5|method5;
   tearoff method5 = self::Extension5|get#method5;
 }
-static method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
-static method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension1|method1<T extends core::Object, S extends core::Object>(lowered final self::Extension1|method1::T #this) → dynamic {}
+static extension-member method Extension1|get#method1<T extends core::Object>(lowered final self::Extension1|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension1|method1<self::Extension1|get#method1::T, S>(#this);
-static method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
-static method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension1|method2<T extends core::Object, S extends core::String>(lowered final self::Extension1|method2::T #this) → dynamic {}
+static extension-member method Extension1|get#method2<T extends core::Object>(lowered final self::Extension1|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension1|method2<self::Extension1|get#method2::T, S>(#this);
-static method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
-static method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension1|method3<T extends core::Object, S extends dynamic>(lowered final self::Extension1|method3::T #this) → dynamic {}
+static extension-member method Extension1|get#method3<T extends core::Object>(lowered final self::Extension1|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension1|method3<self::Extension1|get#method3::T, S%>(#this);
-static method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
-static method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension1|method4<T extends core::Object, S extends core::Object? = dynamic>(lowered final self::Extension1|method4::T #this) → dynamic {}
+static extension-member method Extension1|get#method4<T extends core::Object>(lowered final self::Extension1|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension1|method4<self::Extension1|get#method4::T, S%>(#this);
-static method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
-static method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension1|method5<T extends core::Object, S extends core::Object?>(lowered final self::Extension1|method5::T #this) → dynamic {}
+static extension-member method Extension1|get#method5<T extends core::Object>(lowered final self::Extension1|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension1|method5<self::Extension1|get#method5::T, S%>(#this);
-static method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
-static method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension2|method1<T extends core::String, S extends core::Object>(lowered final self::Extension2|method1::T #this) → dynamic {}
+static extension-member method Extension2|get#method1<T extends core::String>(lowered final self::Extension2|get#method1::T #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension2|method1<self::Extension2|get#method1::T, S>(#this);
-static method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
-static method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
+static extension-member method Extension2|method2<T extends core::String, S extends core::String>(lowered final self::Extension2|method2::T #this) → dynamic {}
+static extension-member method Extension2|get#method2<T extends core::String>(lowered final self::Extension2|get#method2::T #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension2|method2<self::Extension2|get#method2::T, S>(#this);
-static method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
-static method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension2|method3<T extends core::String, S extends dynamic>(lowered final self::Extension2|method3::T #this) → dynamic {}
+static extension-member method Extension2|get#method3<T extends core::String>(lowered final self::Extension2|get#method3::T #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension2|method3<self::Extension2|get#method3::T, S%>(#this);
-static method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension2|get#method4<T extends core::String>(lowered final self::Extension2|get#method4::T #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension2|method4<self::Extension2|get#method4::T, S%>(#this);
-static method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
-static method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
-static method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension2|method4<T extends core::String, S extends core::Object? = dynamic>(lowered final self::Extension2|method4::T #this) → dynamic {}
+static extension-member method Extension2|method5<T extends core::String, S extends core::Object?>(lowered final self::Extension2|method5::T #this) → dynamic {}
+static extension-member method Extension2|get#method5<T extends core::String>(lowered final self::Extension2|get#method5::T #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension2|method5<self::Extension2|get#method5::T, S%>(#this);
-static method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
-static method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension3|method1<T extends dynamic, S extends core::Object>(lowered final self::Extension3|method1::T% #this) → dynamic {}
+static extension-member method Extension3|get#method1<T extends dynamic>(lowered final self::Extension3|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension3|method1<self::Extension3|get#method1::T%, S>(#this);
-static method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
-static method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension3|method2<T extends dynamic, S extends core::String>(lowered final self::Extension3|method2::T% #this) → dynamic {}
+static extension-member method Extension3|get#method2<T extends dynamic>(lowered final self::Extension3|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension3|method2<self::Extension3|get#method2::T%, S>(#this);
-static method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
-static method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension3|method3<T extends dynamic, S extends dynamic>(lowered final self::Extension3|method3::T% #this) → dynamic {}
+static extension-member method Extension3|get#method3<T extends dynamic>(lowered final self::Extension3|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension3|method3<self::Extension3|get#method3::T%, S%>(#this);
-static method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
-static method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension3|method4<T extends dynamic, S extends core::Object? = dynamic>(lowered final self::Extension3|method4::T% #this) → dynamic {}
+static extension-member method Extension3|get#method4<T extends dynamic>(lowered final self::Extension3|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension3|method4<self::Extension3|get#method4::T%, S%>(#this);
-static method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
-static method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension3|method5<T extends dynamic, S extends core::Object?>(lowered final self::Extension3|method5::T% #this) → dynamic {}
+static extension-member method Extension3|get#method5<T extends dynamic>(lowered final self::Extension3|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension3|method5<self::Extension3|get#method5::T%, S%>(#this);
-static method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
-static method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension4|method1<T extends core::Object? = dynamic, S extends core::Object>(lowered final self::Extension4|method1::T% #this) → dynamic {}
+static extension-member method Extension4|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension4|method1<self::Extension4|get#method1::T%, S>(#this);
-static method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
-static method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension4|method2<T extends core::Object? = dynamic, S extends core::String>(lowered final self::Extension4|method2::T% #this) → dynamic {}
+static extension-member method Extension4|get#method2<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension4|method2<self::Extension4|get#method2::T%, S>(#this);
-static method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
-static method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension4|method3<T extends core::Object? = dynamic, S extends dynamic>(lowered final self::Extension4|method3::T% #this) → dynamic {}
+static extension-member method Extension4|get#method3<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension4|method3<self::Extension4|get#method3::T%, S%>(#this);
-static method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
-static method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension4|method4<T extends core::Object? = dynamic, S extends core::Object? = dynamic>(lowered final self::Extension4|method4::T% #this) → dynamic {}
+static extension-member method Extension4|get#method4<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension4|method4<self::Extension4|get#method4::T%, S%>(#this);
-static method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
-static method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension4|method5<T extends core::Object? = dynamic, S extends core::Object?>(lowered final self::Extension4|method5::T% #this) → dynamic {}
+static extension-member method Extension4|get#method5<T extends core::Object? = dynamic>(lowered final self::Extension4|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension4|method5<self::Extension4|get#method5::T%, S%>(#this);
-static method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
-static method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
+static extension-member method Extension5|method1<T extends core::Object?, S extends core::Object>(lowered final self::Extension5|method1::T% #this) → dynamic {}
+static extension-member method Extension5|get#method1<T extends core::Object?>(lowered final self::Extension5|get#method1::T% #this) → <S extends core::Object>() → dynamic
   return <S extends core::Object>() → dynamic => self::Extension5|method1<self::Extension5|get#method1::T%, S>(#this);
-static method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
-static method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
+static extension-member method Extension5|method2<T extends core::Object?, S extends core::String>(lowered final self::Extension5|method2::T% #this) → dynamic {}
+static extension-member method Extension5|get#method2<T extends core::Object?>(lowered final self::Extension5|get#method2::T% #this) → <S extends core::String>() → dynamic
   return <S extends core::String>() → dynamic => self::Extension5|method2<self::Extension5|get#method2::T%, S>(#this);
-static method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
-static method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
+static extension-member method Extension5|method3<T extends core::Object?, S extends dynamic>(lowered final self::Extension5|method3::T% #this) → dynamic {}
+static extension-member method Extension5|get#method3<T extends core::Object?>(lowered final self::Extension5|get#method3::T% #this) → <S extends dynamic>() → dynamic
   return <S extends dynamic>() → dynamic => self::Extension5|method3<self::Extension5|get#method3::T%, S%>(#this);
-static method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
-static method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
+static extension-member method Extension5|method4<T extends core::Object?, S extends core::Object? = dynamic>(lowered final self::Extension5|method4::T% #this) → dynamic {}
+static extension-member method Extension5|get#method4<T extends core::Object?>(lowered final self::Extension5|get#method4::T% #this) → <S extends core::Object? = dynamic>() → dynamic
   return <S extends core::Object? = dynamic>() → dynamic => self::Extension5|method4<self::Extension5|get#method4::T%, S%>(#this);
-static method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
-static method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
+static extension-member method Extension5|method5<T extends core::Object?, S extends core::Object?>(lowered final self::Extension5|method5::T% #this) → dynamic {}
+static extension-member method Extension5|get#method5<T extends core::Object?>(lowered final self::Extension5|get#method5::T% #this) → <S extends core::Object?>() → dynamic
   return <S extends core::Object?>() → dynamic => self::Extension5|method5<self::Extension5|get#method5::T%, S%>(#this);
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.strong.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.strong.expect
index f174e5f29c3..c5636344a67 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.strong.expect
@@ -5,8 +5,8 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic {}
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic {}
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic {
   never{Never}.extensionMethod();
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.strong.transformed.expect
index f174e5f29c3..c5636344a67 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.strong.transformed.expect
@@ -5,8 +5,8 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic {}
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic {}
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic {
   never{Never}.extensionMethod();
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.expect
index df69330c13a..591ac83cda3 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.expect
@@ -6,8 +6,8 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic {}
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic {}
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic {
   let final Never #t1 = (let final Never #t2 = never in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){Never}.extensionMethod() in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.modular.expect
index df69330c13a..591ac83cda3 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.modular.expect
@@ -6,8 +6,8 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic {}
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic {}
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic {
   let final Never #t1 = (let final Never #t2 = never in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){Never}.extensionMethod() in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.outline.expect
index 1230129ab57..064a768e536 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.outline.expect
@@ -5,9 +5,9 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic
   ;
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.transformed.expect
index df69330c13a..591ac83cda3 100644
--- a/pkg/front_end/testcases/nnbd/extension_never.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_never.dart.weak.transformed.expect
@@ -6,8 +6,8 @@ extension Extension on Never {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final Never #this) → dynamic {}
-static method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
+static extension-member method Extension|extensionMethod(lowered final Never #this) → dynamic {}
+static extension-member method Extension|get#extensionMethod(lowered final Never #this) → () → dynamic
   return () → dynamic => self::Extension|extensionMethod(#this);
 static method implicitAccess(Never never) → dynamic {
   let final Never #t1 = (let final Never #t2 = never in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){Never}.extensionMethod() in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.expect
index ea84d0cd1fa..53b0e5320d4 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.expect
@@ -39,13 +39,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.transformed.expect
index 5d74825ee9b..95b0e5b224e 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.strong.transformed.expect
@@ -39,13 +39,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.expect
index 95f5c9e2964..e4fb2166803 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.expect
@@ -39,13 +39,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.modular.expect
index 95f5c9e2964..e4fb2166803 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.modular.expect
@@ -39,13 +39,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.outline.expect
index 8591fd7ea93..0c6430dbdfa 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.outline.expect
@@ -18,13 +18,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   ;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   ;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class
   ;
diff --git a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.transformed.expect
index e07833e8aa3..85747783f96 100644
--- a/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/extension_type_variable_bound.dart.weak.transformed.expect
@@ -39,13 +39,13 @@ extension BoundExtension<T extends self::Class> on T {
   method method2 = self::BoundExtension|method2;
   tearoff method2 = self::BoundExtension|get#method2;
 }
-static method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
+static extension-member method Extension|method1<T extends core::Object? = dynamic>(lowered final self::Extension|method1::T% #this) → self::Extension|method1::T%
   return #this;
-static method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
+static extension-member method Extension|get#method1<T extends core::Object? = dynamic>(lowered final self::Extension|get#method1::T% #this) → () → self::Extension|get#method1::T%
   return () → self::Extension|get#method1::T% => self::Extension|method1<self::Extension|get#method1::T%>(#this);
-static method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
+static extension-member method BoundExtension|method2<T extends self::Class>(lowered final self::BoundExtension|method2::T #this) → self::BoundExtension|method2::T
   return #this;
-static method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
+static extension-member method BoundExtension|get#method2<T extends self::Class>(lowered final self::BoundExtension|get#method2::T #this) → () → self::BoundExtension|get#method2::T
   return () → self::BoundExtension|get#method2::T => self::BoundExtension|method2<self::BoundExtension|get#method2::T>(#this);
 static method test1<T extends core::Object? = dynamic>(self::test1::T% t1) → self::Class {
   if(t1 is self::SubClass) {
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.expect
index 91668ad508b..711690423b6 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.expect
@@ -113,10 +113,10 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.transformed.expect
index 91668ad508b..711690423b6 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.strong.transformed.expect
@@ -113,10 +113,10 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.expect
index 91668ad508b..711690423b6 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.expect
@@ -113,10 +113,10 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.modular.expect
index 91668ad508b..711690423b6 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.modular.expect
@@ -113,10 +113,10 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.outline.expect
index f90420a5913..9fc248d676e 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.outline.expect
@@ -33,11 +33,11 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.transformed.expect
index 91668ad508b..711690423b6 100644
--- a/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/external_field_errors.dart.weak.transformed.expect
@@ -113,10 +113,10 @@ external static set topLevelField(core::int #externalFieldValue) → void;
 external static get finalTopLevelField() → core::int;
 external static get constField() → core::int;
 external static set constField(core::int #externalFieldValue) → void;
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
-external static get Extension|extensionStaticField() → core::int;
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
-external static get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.strong.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.strong.expect
index 7d9a599ddd4..7d516a64c7b 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.strong.expect
@@ -101,23 +101,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @#C1
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @#C1
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @#C1
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @#C1
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.strong.transformed.expect
index 7d9a599ddd4..7d516a64c7b 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.strong.transformed.expect
@@ -101,23 +101,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @#C1
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @#C1
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @#C1
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @#C1
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.expect
index 7d9a599ddd4..7d516a64c7b 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.expect
@@ -101,23 +101,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @#C1
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @#C1
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @#C1
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @#C1
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.modular.expect
index 7d9a599ddd4..7d516a64c7b 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.modular.expect
@@ -101,23 +101,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @#C1
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @#C1
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @#C1
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @#C1
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.outline.expect
index 9f6a43a0751..8abdfe268af 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.outline.expect
@@ -99,23 +99,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @self::Annotation::•()
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @self::Annotation::•()
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @self::Annotation::•()
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @self::Annotation::•()
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @self::Annotation::•()
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @self::Annotation::•()
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic
   ;
 
diff --git a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.transformed.expect
index 7d9a599ddd4..7d516a64c7b 100644
--- a/pkg/front_end/testcases/nnbd/external_fields.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/external_fields.dart.weak.transformed.expect
@@ -101,23 +101,23 @@ external static get untypedTopLevelField() → dynamic;
 external static set untypedTopLevelField(dynamic #externalFieldValue) → void;
 external static get untypedFinalTopLevelField() → dynamic;
 @#C1
-external static method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#extensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
+external static extension-member method Extension|set#extensionInstanceField(lowered self::A #this, core::int #externalFieldValue) → void;
 @#C1
-external static method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
+external static extension-member method Extension|get#finalExtensionInstanceField(lowered self::A #this) → core::int;
 @#C1
-external static get Extension|extensionStaticField() → core::int;
+external static extension-member get Extension|extensionStaticField() → core::int;
 @#C1
-external static set Extension|extensionStaticField(core::int #externalFieldValue) → void;
+external static extension-member set Extension|extensionStaticField(core::int #externalFieldValue) → void;
 @#C1
-external static get Extension|finalExtensionStaticField() → core::int;
-external static method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
-external static method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
-external static method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
-external static get Extension|untypedExtensionStaticField() → dynamic;
-external static set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
-external static get Extension|untypedFinalExtensionStaticField() → dynamic;
+external static extension-member get Extension|finalExtensionStaticField() → core::int;
+external static extension-member method Extension|get#untypedExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member method Extension|set#untypedExtensionInstanceField(lowered self::A #this, dynamic #externalFieldValue) → void;
+external static extension-member method Extension|get#untypedFinalExtensionInstanceField(lowered self::A #this) → dynamic;
+external static extension-member get Extension|untypedExtensionStaticField() → dynamic;
+external static extension-member set Extension|untypedExtensionStaticField(dynamic #externalFieldValue) → void;
+external static extension-member get Extension|untypedFinalExtensionStaticField() → dynamic;
 static method main() → dynamic {}
 
 constants  {
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.strong.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.strong.expect
index 81ebb6f5c8e..998154df243 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.strong.expect
@@ -237,37 +237,37 @@ static set property2(core::num value) → void {}
 static get property3() → core::num
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
-static method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
+static extension-member method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
+static extension-member method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
   return 0;
-static method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
+static extension-member method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:130:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
-static method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
+static extension-member method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
+static extension-member method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:133:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
-static method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
+static extension-member method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
+static extension-member method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:136:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property6 => 0; // error
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::num value) → void {}
-static get Extension|property9() → core::num
+static extension-member set Extension|property8(core::num value) → void {}
+static extension-member get Extension|property9() → core::num
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.expect
index 81ebb6f5c8e..998154df243 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.expect
@@ -237,37 +237,37 @@ static set property2(core::num value) → void {}
 static get property3() → core::num
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
-static method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
+static extension-member method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
+static extension-member method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
   return 0;
-static method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
+static extension-member method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:130:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
-static method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
+static extension-member method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
+static extension-member method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:133:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
-static method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
+static extension-member method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
+static extension-member method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:136:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property6 => 0; // error
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::num value) → void {}
-static get Extension|property9() → core::num
+static extension-member set Extension|property8(core::num value) → void {}
+static extension-member get Extension|property9() → core::num
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.modular.expect
index 81ebb6f5c8e..998154df243 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.modular.expect
@@ -237,37 +237,37 @@ static set property2(core::num value) → void {}
 static get property3() → core::num
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
-static method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
+static extension-member method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void {}
+static extension-member method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
   return 0;
-static method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
+static extension-member method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:130:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property4 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
-static method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
+static extension-member method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void {}
+static extension-member method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:133:22: Error: A value of type 'int' can't be returned from a function with return type 'S'.
   S get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
-static method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
+static extension-member method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void {}
+static extension-member method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart:136:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property6 => 0; // error
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::num value) → void {}
-static get Extension|property9() → core::num
+static extension-member set Extension|property8(core::num value) → void {}
+static extension-member get Extension|property9() → core::num
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.outline.expect
index 181f144a10f..3f6c45e8dc0 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type.dart.weak.outline.expect
@@ -222,41 +222,41 @@ static get property3() → core::num
   ;
 static set property3(core::int value) → void
   ;
-static method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::Object? = dynamic, S extends self::Extension|get#property1::T% = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void
+static extension-member method Extension|set#property1<T extends core::Object? = dynamic, S extends self::Extension|set#property1::T% = dynamic>(lowered final core::int #this, core::int i) → void
   ;
-static method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property2<T extends core::Object? = dynamic, S extends self::Extension|get#property2::T% = dynamic>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void
+static extension-member method Extension|set#property2<T extends core::Object? = dynamic, S extends self::Extension|set#property2::T% = dynamic>(lowered final core::int #this, core::num i) → void
   ;
-static method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
+static extension-member method Extension|get#property3<T extends core::Object? = dynamic, S extends self::Extension|get#property3::T% = dynamic>(lowered final core::int #this) → core::num
   ;
-static method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void
+static extension-member method Extension|set#property3<T extends core::Object? = dynamic, S extends self::Extension|set#property3::T% = dynamic>(lowered final core::int #this, core::int i) → void
   ;
-static method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
+static extension-member method Extension|get#property4<T extends core::Object? = dynamic, S extends self::Extension|get#property4::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property4::S%
   ;
-static method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void
+static extension-member method Extension|set#property4<T extends core::Object? = dynamic, S extends self::Extension|set#property4::T% = dynamic>(lowered final core::int #this, self::Extension|set#property4::S% i) → void
   ;
-static method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
+static extension-member method Extension|get#property5<T extends core::Object? = dynamic, S extends self::Extension|get#property5::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property5::S%
   ;
-static method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void
+static extension-member method Extension|set#property5<T extends core::Object? = dynamic, S extends self::Extension|set#property5::T% = dynamic>(lowered final core::int #this, self::Extension|set#property5::T% i) → void
   ;
-static method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
+static extension-member method Extension|get#property6<T extends core::Object? = dynamic, S extends self::Extension|get#property6::T% = dynamic>(lowered final core::int #this) → self::Extension|get#property6::T%
   ;
-static method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void
+static extension-member method Extension|set#property6<T extends core::Object? = dynamic, S extends self::Extension|set#property6::T% = dynamic>(lowered final core::int #this, self::Extension|set#property6::S% i) → void
   ;
-static get Extension|property7() → core::int
+static extension-member get Extension|property7() → core::int
   ;
-static set Extension|property7(core::int value) → void
+static extension-member set Extension|property7(core::int value) → void
   ;
-static get Extension|property8() → core::int
+static extension-member get Extension|property8() → core::int
   ;
-static set Extension|property8(core::num value) → void
+static extension-member set Extension|property8(core::num value) → void
   ;
-static get Extension|property9() → core::num
+static extension-member get Extension|property9() → core::num
   ;
-static set Extension|property9(core::int value) → void
+static extension-member set Extension|property9(core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.expect
index 063f6f4b0ec..5136f8ee731 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.expect
@@ -243,42 +243,42 @@ static set property2(core::int? value) → void {}
 static get property3() → core::int?
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   return 0;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:134:23: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property4a => 0; // ok
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:137:24: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property4b => 0; // ok
                        ^" in 0 as{TypeError} Never;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:140:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:143:23: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property6 => 0; // error
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::int? value) → void {}
-static get Extension|property9() → core::int?
+static extension-member set Extension|property8(core::int? value) → void {}
+static extension-member get Extension|property9() → core::int?
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.transformed.expect
index 063f6f4b0ec..5136f8ee731 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.strong.transformed.expect
@@ -243,42 +243,42 @@ static set property2(core::int? value) → void {}
 static get property3() → core::int?
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   return 0;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:134:23: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property4a => 0; // ok
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:137:24: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property4b => 0; // ok
                        ^" in 0 as{TypeError} Never;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:140:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:143:23: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property6 => 0; // error
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::int? value) → void {}
-static get Extension|property9() → core::int?
+static extension-member set Extension|property8(core::int? value) → void {}
+static extension-member get Extension|property9() → core::int?
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.expect
index 063f6f4b0ec..5136f8ee731 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.expect
@@ -243,42 +243,42 @@ static set property2(core::int? value) → void {}
 static get property3() → core::int?
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   return 0;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:134:23: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property4a => 0; // ok
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:137:24: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property4b => 0; // ok
                        ^" in 0 as{TypeError} Never;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:140:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:143:23: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property6 => 0; // error
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::int? value) → void {}
-static get Extension|property9() → core::int?
+static extension-member set Extension|property8(core::int? value) → void {}
+static extension-member get Extension|property9() → core::int?
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.modular.expect
index 063f6f4b0ec..5136f8ee731 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.modular.expect
@@ -243,42 +243,42 @@ static set property2(core::int? value) → void {}
 static get property3() → core::int?
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   return 0;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:134:23: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property4a => 0; // ok
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:137:24: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property4b => 0; // ok
                        ^" in 0 as{TypeError} Never;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:140:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:143:23: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property6 => 0; // error
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::int? value) → void {}
-static get Extension|property9() → core::int?
+static extension-member set Extension|property8(core::int? value) → void {}
+static extension-member get Extension|property9() → core::int?
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.outline.expect
index d8f783226c2..c58878d10dc 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.outline.expect
@@ -224,45 +224,45 @@ static get property3() → core::int?
   ;
 static set property3(core::int value) → void
   ;
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void
   ;
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   ;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void
   ;
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   ;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void
   ;
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   ;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void
   ;
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   ;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void
   ;
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   ;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void
   ;
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   ;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void
   ;
-static get Extension|property7() → core::int
+static extension-member get Extension|property7() → core::int
   ;
-static set Extension|property7(core::int value) → void
+static extension-member set Extension|property7(core::int value) → void
   ;
-static get Extension|property8() → core::int
+static extension-member get Extension|property8() → core::int
   ;
-static set Extension|property8(core::int? value) → void
+static extension-member set Extension|property8(core::int? value) → void
   ;
-static get Extension|property9() → core::int?
+static extension-member get Extension|property9() → core::int?
   ;
-static set Extension|property9(core::int value) → void
+static extension-member set Extension|property9(core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.transformed.expect
index 063f6f4b0ec..5136f8ee731 100644
--- a/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart.weak.transformed.expect
@@ -243,42 +243,42 @@ static set property2(core::int? value) → void {}
 static get property3() → core::int?
   return 0;
 static set property3(core::int value) → void {}
-static method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|get#property1<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
+static extension-member method Extension|set#property1<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property2<T extends core::num>(lowered final core::int #this) → core::int
   return 0;
-static method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
-static method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
+static extension-member method Extension|set#property2<T extends core::num>(lowered final core::int #this, core::int? i) → void {}
+static extension-member method Extension|get#property3<T extends core::num>(lowered final core::int #this) → core::int?
   return 0;
-static method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
-static method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
+static extension-member method Extension|set#property3<T extends core::num>(lowered final core::int #this, core::int i) → void {}
+static extension-member method Extension|get#property4a<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4a::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:134:23: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property4a => 0; // ok
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
-static method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
+static extension-member method Extension|set#property4a<T extends core::num>(lowered final core::int #this, self::Extension|set#property4a::T i) → void {}
+static extension-member method Extension|get#property4b<T extends core::num>(lowered final core::int #this) → self::Extension|get#property4b::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:137:24: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property4b => 0; // ok
                        ^" in 0 as{TypeError} Never;
-static method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
-static method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
+static extension-member method Extension|set#property4b<T extends core::num>(lowered final core::int #this, self::Extension|set#property4b::T? i) → void {}
+static extension-member method Extension|get#property5<T extends core::num>(lowered final core::int #this) → self::Extension|get#property5::T
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:140:22: Error: A value of type 'int' can't be returned from a function with return type 'T'.
   T get property5 => 0; // ok
                      ^" in 0 as{TypeError} Never;
-static method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
-static method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
+static extension-member method Extension|set#property5<T extends core::num>(lowered final core::int #this, self::Extension|set#property5::T? i) → void {}
+static extension-member method Extension|get#property6<T extends core::num>(lowered final core::int #this) → self::Extension|get#property6::T?
   return invalid-expression "pkg/front_end/testcases/nnbd/getter_vs_setter_type_nnbd.dart:143:23: Error: A value of type 'int' can't be returned from a function with return type 'T?'.
   T? get property6 => 0; // error
                       ^" in 0 as{TypeError} Never;
-static method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
-static get Extension|property7() → core::int
+static extension-member method Extension|set#property6<T extends core::num>(lowered final core::int #this, self::Extension|set#property6::T i) → void {}
+static extension-member get Extension|property7() → core::int
   return 0;
-static set Extension|property7(core::int value) → void {}
-static get Extension|property8() → core::int
+static extension-member set Extension|property7(core::int value) → void {}
+static extension-member get Extension|property8() → core::int
   return 0;
-static set Extension|property8(core::int? value) → void {}
-static get Extension|property9() → core::int?
+static extension-member set Extension|property8(core::int? value) → void {}
+static extension-member get Extension|property9() → core::int?
   return 0;
-static set Extension|property9(core::int value) → void {}
+static extension-member set Extension|property9(core::int value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.expect
index 3c8ff8e9f52..3dde37db4f9 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.expect
@@ -56,8 +56,8 @@ static method test4() → dynamic {
   core::List<core::String?> list = <core::String?>[null];
   core::String s = let final core::List<core::String?> #t10 = list in let final core::int #t11 = 0 in let final core::String? #t12 = #t10.{core::List::[]}(#t11){(core::int) → core::String?} in #t12 == null ?{core::String} let final core::String #t13 = "bar" in let final void #t14 = #t10.{core::List::[]=}(#t11, #t13){(core::int, core::String?) → void} in #t13 : #t12{core::String};
 }
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   return null;
 static method test6() → dynamic {
   core::String s = let final core::double #t15 = 3.14 in let final core::int #t16 = 0 in let final core::String? #t17 = self::E6|[](#t15, #t16) in #t17 == null ?{core::String} let final core::String #t18 = "bar" in let final void #t19 = self::E6|[]=(#t15, #t16, #t18) in #t18 : #t17{core::String};
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.transformed.expect
index 57a70ce53a0..8de0aa47d44 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.strong.transformed.expect
@@ -56,8 +56,8 @@ static method test4() → dynamic {
   core::List<core::String?> list = core::_GrowableList::_literal1<core::String?>(null);
   core::String s = let final core::List<core::String?> #t10 = list in let final core::int #t11 = 0 in let final core::String? #t12 = #t10.{core::List::[]}(#t11){(core::int) → core::String?} in #t12 == null ?{core::String} let final core::String #t13 = "bar" in let final void #t14 = #t10.{core::List::[]=}(#t11, #t13){(core::int, core::String?) → void} in #t13 : #t12{core::String};
 }
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   return null;
 static method test6() → dynamic {
   core::String s = let final core::double #t15 = 3.14 in let final core::int #t16 = 0 in let final core::String? #t17 = self::E6|[](#t15, #t16) in #t17 == null ?{core::String} let final core::String #t18 = "bar" in let final void #t19 = self::E6|[]=(#t15, #t16, #t18) in #t18 : #t17{core::String};
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.expect
index 3c8ff8e9f52..3dde37db4f9 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.expect
@@ -56,8 +56,8 @@ static method test4() → dynamic {
   core::List<core::String?> list = <core::String?>[null];
   core::String s = let final core::List<core::String?> #t10 = list in let final core::int #t11 = 0 in let final core::String? #t12 = #t10.{core::List::[]}(#t11){(core::int) → core::String?} in #t12 == null ?{core::String} let final core::String #t13 = "bar" in let final void #t14 = #t10.{core::List::[]=}(#t11, #t13){(core::int, core::String?) → void} in #t13 : #t12{core::String};
 }
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   return null;
 static method test6() → dynamic {
   core::String s = let final core::double #t15 = 3.14 in let final core::int #t16 = 0 in let final core::String? #t17 = self::E6|[](#t15, #t16) in #t17 == null ?{core::String} let final core::String #t18 = "bar" in let final void #t19 = self::E6|[]=(#t15, #t16, #t18) in #t18 : #t17{core::String};
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.modular.expect
index 3c8ff8e9f52..3dde37db4f9 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.modular.expect
@@ -56,8 +56,8 @@ static method test4() → dynamic {
   core::List<core::String?> list = <core::String?>[null];
   core::String s = let final core::List<core::String?> #t10 = list in let final core::int #t11 = 0 in let final core::String? #t12 = #t10.{core::List::[]}(#t11){(core::int) → core::String?} in #t12 == null ?{core::String} let final core::String #t13 = "bar" in let final void #t14 = #t10.{core::List::[]=}(#t11, #t13){(core::int, core::String?) → void} in #t13 : #t12{core::String};
 }
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   return null;
 static method test6() → dynamic {
   core::String s = let final core::double #t15 = 3.14 in let final core::int #t16 = 0 in let final core::String? #t17 = self::E6|[](#t15, #t16) in #t17 == null ?{core::String} let final core::String #t18 = "bar" in let final void #t19 = self::E6|[]=(#t15, #t16, #t18) in #t18 : #t17{core::String};
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.outline.expect
index 6eb8339e902..98accf05ef5 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.outline.expect
@@ -41,9 +41,9 @@ static method test3() → dynamic
   ;
 static method test4() → dynamic
   ;
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void
   ;
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   ;
 static method test6() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.transformed.expect
index 57a70ce53a0..8de0aa47d44 100644
--- a/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/infer_if_null.dart.weak.transformed.expect
@@ -56,8 +56,8 @@ static method test4() → dynamic {
   core::List<core::String?> list = core::_GrowableList::_literal1<core::String?>(null);
   core::String s = let final core::List<core::String?> #t10 = list in let final core::int #t11 = 0 in let final core::String? #t12 = #t10.{core::List::[]}(#t11){(core::int) → core::String?} in #t12 == null ?{core::String} let final core::String #t13 = "bar" in let final void #t14 = #t10.{core::List::[]=}(#t11, #t13){(core::int, core::String?) → void} in #t13 : #t12{core::String};
 }
-static method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
-static method E6|[](lowered final core::double #this, core::int index) → core::String?
+static extension-member method E6|[]=(lowered final core::double #this, core::int index, core::String? value) → void {}
+static extension-member method E6|[](lowered final core::double #this, core::int index) → core::String?
   return null;
 static method test6() → dynamic {
   core::String s = let final core::double #t15 = 3.14 in let final core::int #t16 = 0 in let final core::String? #t17 = self::E6|[](#t15, #t16) in #t17 == null ?{core::String} let final core::String #t18 = "bar" in let final void #t19 = self::E6|[]=(#t15, #t16, #t18) in #t18 : #t17{core::String};
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.strong.expect
index d32f1bb731c..dbdbbb5b5f8 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.strong.expect
@@ -23,21 +23,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   return 42;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   return 87;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   return 123;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   return 76;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic {
   self::testA(new self::A::•());
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.strong.transformed.expect
index d32f1bb731c..dbdbbb5b5f8 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.strong.transformed.expect
@@ -23,21 +23,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   return 42;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   return 87;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   return 123;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   return 76;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic {
   self::testA(new self::A::•());
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.expect
index d32f1bb731c..dbdbbb5b5f8 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.expect
@@ -23,21 +23,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   return 42;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   return 87;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   return 123;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   return 76;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic {
   self::testA(new self::A::•());
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.modular.expect
index d32f1bb731c..dbdbbb5b5f8 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.modular.expect
@@ -23,21 +23,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   return 42;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   return 87;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   return 123;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   return 76;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic {
   self::testA(new self::A::•());
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.outline.expect
index a5b34e9d8f7..de48c636cc6 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.outline.expect
@@ -22,21 +22,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   ;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   ;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   ;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   ;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.transformed.expect
index d32f1bb731c..dbdbbb5b5f8 100644
--- a/pkg/front_end/testcases/nnbd/issue41349.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue41349.dart.weak.transformed.expect
@@ -23,21 +23,21 @@ extension D on () →? core::int {
   method call = self::D|call;
   tearoff call = self::D|get#call;
 }
-static method B|foo(lowered final self::A? #this) → dynamic
+static extension-member method B|foo(lowered final self::A? #this) → dynamic
   return 42;
-static method B|get#foo(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#foo(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|foo(#this);
-static method B|bar(lowered final self::A? #this) → dynamic
+static extension-member method B|bar(lowered final self::A? #this) → dynamic
   return 87;
-static method B|get#bar(lowered final self::A? #this) → () → dynamic
+static extension-member method B|get#bar(lowered final self::A? #this) → () → dynamic
   return () → dynamic => self::B|bar(#this);
-static method C|bar(lowered final self::A #this) → dynamic
+static extension-member method C|bar(lowered final self::A #this) → dynamic
   return 123;
-static method C|get#bar(lowered final self::A #this) → () → dynamic
+static extension-member method C|get#bar(lowered final self::A #this) → () → dynamic
   return () → dynamic => self::C|bar(#this);
-static method D|call(lowered final () →? core::int #this) → core::int
+static extension-member method D|call(lowered final () →? core::int #this) → core::int
   return 76;
-static method D|get#call(lowered final () →? core::int #this) → () → core::int
+static extension-member method D|get#call(lowered final () →? core::int #this) → () → core::int
   return () → core::int => self::D|call(#this);
 static method main() → dynamic {
   self::testA(new self::A::•());
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.strong.expect
index d6c3205ea92..31fdd7e3d73 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.strong.expect
@@ -243,17 +243,17 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
   self::A<self::Extension1|method1::Y%>? c;
   self::A<self::A<Null>>? d;
 }
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
   self::D<self::Extension1|method2::Y>? c;
   self::D<core::String>? d;
 }
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic {
   self::A<Null> a = new self::A::•<Null>();
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.strong.transformed.expect
index d6c3205ea92..31fdd7e3d73 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.strong.transformed.expect
@@ -243,17 +243,17 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
   self::A<self::Extension1|method1::Y%>? c;
   self::A<self::A<Null>>? d;
 }
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
   self::D<self::Extension1|method2::Y>? c;
   self::D<core::String>? d;
 }
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic {
   self::A<Null> a = new self::A::•<Null>();
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.expect
index d6c3205ea92..31fdd7e3d73 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.expect
@@ -243,17 +243,17 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
   self::A<self::Extension1|method1::Y%>? c;
   self::A<self::A<Null>>? d;
 }
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
   self::D<self::Extension1|method2::Y>? c;
   self::D<core::String>? d;
 }
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic {
   self::A<Null> a = new self::A::•<Null>();
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.modular.expect
index d6c3205ea92..31fdd7e3d73 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.modular.expect
@@ -243,17 +243,17 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
   self::A<self::Extension1|method1::Y%>? c;
   self::A<self::A<Null>>? d;
 }
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
   self::D<self::Extension1|method2::Y>? c;
   self::D<core::String>? d;
 }
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic {
   self::A<Null> a = new self::A::•<Null>();
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.outline.expect
index b9e71484fdd..f622e11e1b5 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.outline.expect
@@ -137,13 +137,13 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void
   ;
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void
   ;
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.transformed.expect
index d6c3205ea92..31fdd7e3d73 100644
--- a/pkg/front_end/testcases/nnbd/issue43211.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43211.dart.weak.transformed.expect
@@ -243,17 +243,17 @@ extension Extension1<X extends self::A<X%>? = self::A<dynamic>?> on self::A<X%>
 }
 extension ext2<X extends self::A<Null>?> on self::A<X%> {
 }
-static method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
+static extension-member method Extension1|method1<X extends self::A<self::Extension1|method1::X%>? = self::A<dynamic>?, Y extends self::A<self::Extension1|method1::Y%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|method1::X%> #this, self::A<self::Extension1|method1::Y%> a, self::A<self::A<Null>>? b) → void {
   self::A<self::Extension1|method1::Y%>? c;
   self::A<self::A<Null>>? d;
 }
-static method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
+static extension-member method Extension1|get#method1<X extends self::A<self::Extension1|get#method1::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method1::X%> #this) → <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%>, self::A<self::A<Null>>?) → void
   return <Y extends self::A<Y%>? = self::A<dynamic>?>(self::A<Y%> a, self::A<self::A<Null>>? b) → void => self::Extension1|method1<self::Extension1|get#method1::X%, Y%>(#this, a, b);
-static method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
+static extension-member method Extension1|method2<X extends self::A<self::Extension1|method2::X%>? = self::A<dynamic>?, Y extends core::String>(lowered final self::A<self::Extension1|method2::X%> #this, self::D<self::Extension1|method2::Y> a, self::D<core::String>? b) → void {
   self::D<self::Extension1|method2::Y>? c;
   self::D<core::String>? d;
 }
-static method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
+static extension-member method Extension1|get#method2<X extends self::A<self::Extension1|get#method2::X%>? = self::A<dynamic>?>(lowered final self::A<self::Extension1|get#method2::X%> #this) → <Y extends core::String>(self::D<Y>, self::D<core::String>?) → void
   return <Y extends core::String>(self::D<Y> a, self::D<core::String>? b) → void => self::Extension1|method2<self::Extension1|get#method2::X%, Y>(#this, a, b);
 static method test() → dynamic {
   self::A<Null> a = new self::A::•<Null>();
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.strong.expect
index 9b7e16cea3e..f8a9d275325 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.strong.expect
@@ -64,10 +64,10 @@ Try accessing using ?. instead.
   let final dynamic #t3 = d in #t3{dynamic}.foo == null ?{dynamic} #t3{dynamic}.foo = x : null;
   let final self::A? #t4 = a in #t4 == null ?{core::int?} null : let final self::A #t5 = #t4{self::A}.{self::A::bar}{self::A} in #t5.{self::A::foo}{core::int?} == null ?{core::int} #t5.{self::A::foo} = x : null;
 }
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   return null;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   return new self::B::•();
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic {
   let final self::B? #t6 = b in invalid-expression "pkg/front_end/testcases/nnbd/issue43278.dart:28:5: Error: Property 'fooExtension' cannot be accessed on 'B?' because it is potentially null.
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.strong.transformed.expect
index 9b7e16cea3e..f8a9d275325 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.strong.transformed.expect
@@ -64,10 +64,10 @@ Try accessing using ?. instead.
   let final dynamic #t3 = d in #t3{dynamic}.foo == null ?{dynamic} #t3{dynamic}.foo = x : null;
   let final self::A? #t4 = a in #t4 == null ?{core::int?} null : let final self::A #t5 = #t4{self::A}.{self::A::bar}{self::A} in #t5.{self::A::foo}{core::int?} == null ?{core::int} #t5.{self::A::foo} = x : null;
 }
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   return null;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   return new self::B::•();
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic {
   let final self::B? #t6 = b in invalid-expression "pkg/front_end/testcases/nnbd/issue43278.dart:28:5: Error: Property 'fooExtension' cannot be accessed on 'B?' because it is potentially null.
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.expect
index 9b7e16cea3e..f8a9d275325 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.expect
@@ -64,10 +64,10 @@ Try accessing using ?. instead.
   let final dynamic #t3 = d in #t3{dynamic}.foo == null ?{dynamic} #t3{dynamic}.foo = x : null;
   let final self::A? #t4 = a in #t4 == null ?{core::int?} null : let final self::A #t5 = #t4{self::A}.{self::A::bar}{self::A} in #t5.{self::A::foo}{core::int?} == null ?{core::int} #t5.{self::A::foo} = x : null;
 }
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   return null;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   return new self::B::•();
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic {
   let final self::B? #t6 = b in invalid-expression "pkg/front_end/testcases/nnbd/issue43278.dart:28:5: Error: Property 'fooExtension' cannot be accessed on 'B?' because it is potentially null.
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.modular.expect
index 9b7e16cea3e..f8a9d275325 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.modular.expect
@@ -64,10 +64,10 @@ Try accessing using ?. instead.
   let final dynamic #t3 = d in #t3{dynamic}.foo == null ?{dynamic} #t3{dynamic}.foo = x : null;
   let final self::A? #t4 = a in #t4 == null ?{core::int?} null : let final self::A #t5 = #t4{self::A}.{self::A::bar}{self::A} in #t5.{self::A::foo}{core::int?} == null ?{core::int} #t5.{self::A::foo} = x : null;
 }
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   return null;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   return new self::B::•();
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic {
   let final self::B? #t6 = b in invalid-expression "pkg/front_end/testcases/nnbd/issue43278.dart:28:5: Error: Property 'fooExtension' cannot be accessed on 'B?' because it is potentially null.
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.outline.expect
index 0f17390fb82..ed132e45477 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.outline.expect
@@ -19,11 +19,11 @@ extension Extension on self::B {
 }
 static method test<T extends self::A?>(self::A? a, self::test::T% t, dynamic d, core::int x) → dynamic
   ;
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   ;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void
   ;
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   ;
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.transformed.expect
index 9b7e16cea3e..f8a9d275325 100644
--- a/pkg/front_end/testcases/nnbd/issue43278.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43278.dart.weak.transformed.expect
@@ -64,10 +64,10 @@ Try accessing using ?. instead.
   let final dynamic #t3 = d in #t3{dynamic}.foo == null ?{dynamic} #t3{dynamic}.foo = x : null;
   let final self::A? #t4 = a in #t4 == null ?{core::int?} null : let final self::A #t5 = #t4{self::A}.{self::A::bar}{self::A} in #t5.{self::A::foo}{core::int?} == null ?{core::int} #t5.{self::A::foo} = x : null;
 }
-static method Extension|get#fooExtension(lowered final self::B #this) → core::int?
+static extension-member method Extension|get#fooExtension(lowered final self::B #this) → core::int?
   return null;
-static method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
-static method Extension|get#barExtension(lowered final self::B #this) → self::B
+static extension-member method Extension|set#fooExtension(lowered final self::B #this, core::int? value) → void {}
+static extension-member method Extension|get#barExtension(lowered final self::B #this) → self::B
   return new self::B::•();
 static method testExtension<T extends self::B?>(self::B? b, self::testExtension::T% t, core::int x) → dynamic {
   let final self::B? #t6 = b in invalid-expression "pkg/front_end/testcases/nnbd/issue43278.dart:28:5: Error: Property 'fooExtension' cannot be accessed on 'B?' because it is potentially null.
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.strong.expect
index ccb1b66a2a1..2fab08b1e04 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.strong.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   return (self::E|get#f::T% t) → self::E|get#f::T% => t;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic {
   (self::method1::S%) → self::method1::S% f = self::E|get#f<self::method1::S%>(s);
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.strong.transformed.expect
index ccb1b66a2a1..2fab08b1e04 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.strong.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   return (self::E|get#f::T% t) → self::E|get#f::T% => t;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic {
   (self::method1::S%) → self::method1::S% f = self::E|get#f<self::method1::S%>(s);
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.expect
index ccb1b66a2a1..2fab08b1e04 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   return (self::E|get#f::T% t) → self::E|get#f::T% => t;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic {
   (self::method1::S%) → self::method1::S% f = self::E|get#f<self::method1::S%>(s);
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.modular.expect
index ccb1b66a2a1..2fab08b1e04 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.modular.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   return (self::E|get#f::T% t) → self::E|get#f::T% => t;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic {
   (self::method1::S%) → self::method1::S% f = self::E|get#f<self::method1::S%>(s);
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.outline.expect
index ebcaf264d30..9e800f32d2f 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   ;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.transformed.expect
index ccb1b66a2a1..2fab08b1e04 100644
--- a/pkg/front_end/testcases/nnbd/issue43591.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43591.dart.weak.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension E<T extends core::Object? = dynamic> on T% {
   get f = self::E|get#f;
 }
-static method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
+static extension-member method E|get#f<T extends core::Object? = dynamic>(lowered final self::E|get#f::T% #this) → (self::E|get#f::T%) → self::E|get#f::T%
   return (self::E|get#f::T% t) → self::E|get#f::T% => t;
 static method method1<S extends core::Object? = dynamic>(self::method1::S% s) → dynamic {
   (self::method1::S%) → self::method1::S% f = self::E|get#f<self::method1::S%>(s);
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.strong.expect
index a6008723f16..cb881544ee4 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.strong.expect
@@ -20,8 +20,8 @@ static method main() → dynamic async /* futureValueType= dynamic */ {
     self::_extension#0|checkStaticType<core::int, (core::int) → core::int>(#t2);
   } =>#t2;
 }
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   return o as self::contextType::T%;
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.strong.transformed.expect
index a6008723f16..cb881544ee4 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.strong.transformed.expect
@@ -20,8 +20,8 @@ static method main() → dynamic async /* futureValueType= dynamic */ {
     self::_extension#0|checkStaticType<core::int, (core::int) → core::int>(#t2);
   } =>#t2;
 }
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   return o as self::contextType::T%;
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.expect
index a6008723f16..cb881544ee4 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.expect
@@ -20,8 +20,8 @@ static method main() → dynamic async /* futureValueType= dynamic */ {
     self::_extension#0|checkStaticType<core::int, (core::int) → core::int>(#t2);
   } =>#t2;
 }
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   return o as self::contextType::T%;
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.modular.expect
index a6008723f16..cb881544ee4 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.modular.expect
@@ -20,8 +20,8 @@ static method main() → dynamic async /* futureValueType= dynamic */ {
     self::_extension#0|checkStaticType<core::int, (core::int) → core::int>(#t2);
   } =>#t2;
 }
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   return o as self::contextType::T%;
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.outline.expect
index aa19cd7171e..3761a0cfdd3 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.outline.expect
@@ -13,9 +13,9 @@ static method id<T extends core::Object? = dynamic>(self::id::T% value) → self
   ;
 static method main() → dynamic async 
   ;
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void
   ;
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   ;
diff --git a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.transformed.expect
index a6008723f16..cb881544ee4 100644
--- a/pkg/front_end/testcases/nnbd/issue44595.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue44595.dart.weak.transformed.expect
@@ -20,8 +20,8 @@ static method main() → dynamic async /* futureValueType= dynamic */ {
     self::_extension#0|checkStaticType<core::int, (core::int) → core::int>(#t2);
   } =>#t2;
 }
-static method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
-static method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
+static extension-member method _extension#0|checkStaticType<T extends core::Object? = dynamic, R extends (self::_extension#0|checkStaticType::T%) → self::_extension#0|checkStaticType::T% = (dynamic) → dynamic>(lowered final self::_extension#0|checkStaticType::T% #this) → void {}
+static extension-member method _extension#0|get#checkStaticType<T extends core::Object? = dynamic>(lowered final self::_extension#0|get#checkStaticType::T% #this) → <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void
   return <R extends (self::_extension#0|get#checkStaticType::T%) → self::_extension#0|get#checkStaticType::T% = (dynamic) → dynamic>() → void => self::_extension#0|checkStaticType<self::_extension#0|get#checkStaticType::T%, R>(#this);
 static method contextType<T extends core::Object? = dynamic>(core::Object? o) → self::contextType::T%
   return o as self::contextType::T%;
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.transformed.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.strong.transformed.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.modular.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.modular.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.outline.expect
index 6071eb7658e..6d4cea4be91 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.outline.expect
@@ -11,7 +11,7 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.transformed.expect
index 75c9c2c9d23..d62e150b87c 100644
--- a/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/language_issue1182.dart.weak.transformed.expect
@@ -13,6 +13,6 @@ class Foo<S extends core::num> extends core::Object {
 extension Test<T extends core::Object? = dynamic> on T% {
   get test = self::Test|get#test;
 }
-static method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
+static extension-member method Test|get#test<T extends core::Object? = dynamic>(lowered final self::Test|get#test::T% #this) → (self::Test|get#test::T%) → self::Test|get#test::T%
   return (self::Test|get#test::T% a) → self::Test|get#test::T% => #this;
 static method main() → void {}
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.expect
index f0215b9ce1c..c78614774f1 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.expect
@@ -166,18 +166,18 @@ extension Extension on core::int? {
 static method topLevelMethodAndSetter() → dynamic {}
 static set topLevelMethodAndSetter(dynamic value) → void {}
 static set classAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
-static method Extension|extensionStaticMethodAndSetter() → dynamic {}
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic {}
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart:47:3: Error: Setter not found: 'topLevelMethodAndSetter'.
   topLevelMethodAndSetter = topLevelMethodAndSetter();
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.transformed.expect
index f0215b9ce1c..c78614774f1 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.strong.transformed.expect
@@ -166,18 +166,18 @@ extension Extension on core::int? {
 static method topLevelMethodAndSetter() → dynamic {}
 static set topLevelMethodAndSetter(dynamic value) → void {}
 static set classAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
-static method Extension|extensionStaticMethodAndSetter() → dynamic {}
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic {}
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart:47:3: Error: Setter not found: 'topLevelMethodAndSetter'.
   topLevelMethodAndSetter = topLevelMethodAndSetter();
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.expect
index f0215b9ce1c..c78614774f1 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.expect
@@ -166,18 +166,18 @@ extension Extension on core::int? {
 static method topLevelMethodAndSetter() → dynamic {}
 static set topLevelMethodAndSetter(dynamic value) → void {}
 static set classAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
-static method Extension|extensionStaticMethodAndSetter() → dynamic {}
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic {}
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart:47:3: Error: Setter not found: 'topLevelMethodAndSetter'.
   topLevelMethodAndSetter = topLevelMethodAndSetter();
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.modular.expect
index f0215b9ce1c..c78614774f1 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.modular.expect
@@ -166,18 +166,18 @@ extension Extension on core::int? {
 static method topLevelMethodAndSetter() → dynamic {}
 static set topLevelMethodAndSetter(dynamic value) → void {}
 static set classAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
-static method Extension|extensionStaticMethodAndSetter() → dynamic {}
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic {}
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart:47:3: Error: Setter not found: 'topLevelMethodAndSetter'.
   topLevelMethodAndSetter = topLevelMethodAndSetter();
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.outline.expect
index 08fc18354ee..055e7078a3d 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.outline.expect
@@ -142,25 +142,25 @@ static set topLevelMethodAndSetter(dynamic value) → void
   ;
 static set classAndSetter(dynamic value) → void
   ;
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic
   ;
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void
   ;
-static method Extension|extensionStaticMethodAndSetter() → dynamic
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic
   ;
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void
   ;
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic
   ;
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void
   ;
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic
   ;
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void
   ;
 static method test() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.transformed.expect
index f0215b9ce1c..c78614774f1 100644
--- a/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart.weak.transformed.expect
@@ -166,18 +166,18 @@ extension Extension on core::int? {
 static method topLevelMethodAndSetter() → dynamic {}
 static set topLevelMethodAndSetter(dynamic value) → void {}
 static set classAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|extensionInstanceMethodAndSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndSetter(#this);
-static method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
-static method Extension|extensionStaticMethodAndSetter() → dynamic {}
-static set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
-static method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
-static method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
+static extension-member method Extension|set#extensionInstanceMethodAndSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndSetter() → dynamic {}
+static extension-member set Extension|extensionStaticMethodAndSetter(dynamic value) → void {}
+static extension-member method Extension|extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → dynamic {}
+static extension-member method Extension|get#extensionInstanceMethodAndStaticSetter(lowered final core::int? #this) → () → dynamic
   return () → dynamic => self::Extension|extensionInstanceMethodAndStaticSetter(#this);
-static set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
-static method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
-static method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
+static extension-member set Extension|extensionInstanceMethodAndStaticSetter(dynamic value) → void {}
+static extension-member method Extension|extensionStaticMethodAndInstanceSetter() → dynamic {}
+static extension-member method Extension|set#extensionStaticMethodAndInstanceSetter(lowered final core::int? #this, dynamic value) → void {}
 static method test() → dynamic {
   invalid-expression "pkg/front_end/testcases/nnbd/nonfield_vs_setter.dart:47:3: Error: Setter not found: 'topLevelMethodAndSetter'.
   topLevelMethodAndSetter = topLevelMethodAndSetter();
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.expect
index 11177d13fff..658c94a22aa 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.expect
@@ -13,9 +13,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   return #this;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic {
   self::Class? c;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.transformed.expect
index 11177d13fff..658c94a22aa 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.strong.transformed.expect
@@ -13,9 +13,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   return #this;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic {
   self::Class? c;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.expect
index 11177d13fff..658c94a22aa 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.expect
@@ -13,9 +13,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   return #this;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic {
   self::Class? c;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.modular.expect
index 11177d13fff..658c94a22aa 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.modular.expect
@@ -13,9 +13,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   return #this;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic {
   self::Class? c;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.outline.expect
index ea0e436a533..1d982b14cf7 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.outline.expect
@@ -12,9 +12,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   ;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.transformed.expect
index 11177d13fff..658c94a22aa 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_cascade.dart.weak.transformed.expect
@@ -13,9 +13,9 @@ extension Extension on self::Class {
   method extensionMethod = self::Extension|extensionMethod;
   tearoff extensionMethod = self::Extension|get#extensionMethod;
 }
-static method Extension|extensionMethod(lowered final self::Class #this) → self::Class
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → self::Class
   return #this;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → self::Class
   return () → self::Class => self::Extension|extensionMethod(#this);
 static method main() → dynamic {
   self::Class? c;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.expect
index 15dd869ad76..6b37c8ff721 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.transformed.expect
index 15dd869ad76..6b37c8ff721 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.strong.transformed.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.expect
index 15dd869ad76..6b37c8ff721 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.modular.expect
index 15dd869ad76..6b37c8ff721 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.modular.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.outline.expect
index 9305e02a16d..6f53fec9a87 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.outline.expect
@@ -53,43 +53,43 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   ;
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void
   ;
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   ;
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   ;
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void
   ;
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   ;
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   ;
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   ;
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   ;
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   ;
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   ;
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   ;
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void
   ;
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.transformed.expect
index 15dd869ad76..6b37c8ff721 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_explicit_extension.dart.weak.transformed.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.expect
index 78a219f0367..43db53da579 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.transformed.expect
index 78a219f0367..43db53da579 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.strong.transformed.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.expect
index 78a219f0367..43db53da579 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.modular.expect
index 78a219f0367..43db53da579 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.modular.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.outline.expect
index 9305e02a16d..6f53fec9a87 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.outline.expect
@@ -53,43 +53,43 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   ;
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void
   ;
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   ;
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   ;
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void
   ;
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   ;
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   ;
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   ;
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   ;
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   ;
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   ;
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   ;
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   ;
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void
   ;
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.transformed.expect
index 78a219f0367..43db53da579 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_extension.dart.weak.transformed.expect
@@ -79,46 +79,46 @@ extension Extension2 on self::Class2 {
 extension Extension3 on self::Class3 {
   operator [] = self::Extension3|[];
 }
-static method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|get#nullable1(lowered final self::Class1 #this) → self::Class1?
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
+static extension-member method Extension1|set#nullable1(lowered final self::Class1 #this, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|nonNullable1Method(lowered final self::Class1 #this) → self::Class1
   return self::Extension1|get#nonNullable1(#this);
-static method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
+static extension-member method Extension1|get#nonNullable1Method(lowered final self::Class1 #this) → () → self::Class1
   return () → self::Class1 => self::Extension1|nonNullable1Method(#this);
-static method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
+static extension-member method Extension1|[](lowered final self::Class1 #this, self::Class1? key) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
+static extension-member method Extension1|[]=(lowered final self::Class1 #this, self::Class1? key, self::Class1? value) → void {
   #this.{self::Class1::property} = value;
 }
-static method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
+static extension-member method Extension1|+(lowered final self::Class1 #this, core::int value) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
+static extension-member method Extension1|unary-(lowered final self::Class1 #this) → self::Class1?
   return self::Extension1|get#nullable1(#this);
-static method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
+static extension-member method Extension1|get#nonNullable1(lowered final self::Class1 #this) → self::Class1
   return #this.{self::Class1::property1}{self::Class1};
-static method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
+static extension-member method Extension1|get#nonNullable2(lowered final self::Class1 #this) → self::Class2
   return #this.{self::Class1::property2}{self::Class2};
-static method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|nonNullable2Method(lowered final self::Class2 #this) → self::Class2
   return self::Extension2|get#nonNullable2(#this);
-static method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
+static extension-member method Extension2|get#nonNullable2Method(lowered final self::Class2 #this) → () → self::Class2
   return () → self::Class2 => self::Extension2|nonNullable2Method(#this);
-static method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2? key) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2? key, self::Class2? value) → void
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
+static extension-member method Extension2|+(lowered final self::Class2 #this, core::int value) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|unary-(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
+static extension-member method Extension2|get#nonNullable2(lowered final self::Class2 #this) → self::Class2
   return #this.{self::Class2::property}{self::Class2};
-static method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
+static extension-member method Extension2|set#nonNullable2(lowered final self::Class2 #this, self::Class2 value) → void {
   #this.{self::Class2::property} = value;
 }
-static method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
+static extension-member method Extension3|[](lowered final self::Class3 #this, self::Class3? key) → self::Class2?
   return #this.{self::Class3::property}{self::Class2?};
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.expect
index 1b974e89f3c..c80c333602c 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.expect
@@ -77,9 +77,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   return #this.{self::Class2::field}{core::int};
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
   #this.{self::Class2::field} = value;
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.transformed.expect
index 734b3e846d1..7849cb1b000 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.strong.transformed.expect
@@ -77,9 +77,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   return #this.{self::Class2::field}{core::int};
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
   #this.{self::Class2::field} = value;
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.expect
index 1b974e89f3c..c80c333602c 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.expect
@@ -77,9 +77,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   return #this.{self::Class2::field}{core::int};
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
   #this.{self::Class2::field} = value;
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.modular.expect
index 1b974e89f3c..c80c333602c 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.modular.expect
@@ -77,9 +77,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   return #this.{self::Class2::field}{core::int};
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
   #this.{self::Class2::field} = value;
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.outline.expect
index f79d460d877..a3114568cd3 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.outline.expect
@@ -21,9 +21,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   ;
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.transformed.expect
index 1be2925a4b3..556e8cd95dd 100644
--- a/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/null_shorting_index.dart.weak.transformed.expect
@@ -77,9 +77,9 @@ extension Extension on self::Class2 {
   operator [] = self::Extension|[];
   operator []= = self::Extension|[]=;
 }
-static method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class2 #this, core::int index) → core::int
   return #this.{self::Class2::field}{core::int};
-static method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
+static extension-member method Extension|[]=(lowered final self::Class2 #this, core::int index, core::int value) → void {
   #this.{self::Class2::field} = value;
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.expect
index 67b602e7bc3..fe8668eefe2 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.expect
@@ -11,7 +11,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer self::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.transformed.expect
index 67b602e7bc3..fe8668eefe2 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.strong.transformed.expect
@@ -11,7 +11,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer self::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.expect
index 67b602e7bc3..fe8668eefe2 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.expect
@@ -11,7 +11,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer self::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.modular.expect
index 67b602e7bc3..fe8668eefe2 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.modular.expect
@@ -11,7 +11,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer self::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.outline.expect
index e562a0e8ee2..140330a55ef 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.outline.expect
@@ -10,7 +10,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.transformed.expect
index 67b602e7bc3..fe8668eefe2 100644
--- a/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_extension.dart.weak.transformed.expect
@@ -11,7 +11,7 @@ class A extends core::Object {
 extension /* unnamed */ _extension#0 on self::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final self::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final self::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer self::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.expect
index 8f64f636332..a131c6fce86 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.expect
@@ -14,10 +14,10 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
   let final self::C? #t1 = #this in #t1 == null ?{core::String?} null : #t1{self::C}.{self::C::m} = v;
 }
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
   let final self::C? #t2 = #this in #t2 == null ?{core::String?} null : #t2{self::C}.{self::C::m} = "${index}${value}";
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.transformed.expect
index 5ee802fe1ee..3f4cf095ed6 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.strong.transformed.expect
@@ -14,10 +14,10 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
   let final self::C? #t1 = #this in #t1 == null ?{core::String?} null : #t1{self::C}.{self::C::m} = v;
 }
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
   let final self::C? #t2 = #this in #t2 == null ?{core::String?} null : #t2{self::C}.{self::C::m} = "${index}${value}";
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.expect
index 8f64f636332..a131c6fce86 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.expect
@@ -14,10 +14,10 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
   let final self::C? #t1 = #this in #t1 == null ?{core::String?} null : #t1{self::C}.{self::C::m} = v;
 }
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
   let final self::C? #t2 = #this in #t2 == null ?{core::String?} null : #t2{self::C}.{self::C::m} = "${index}${value}";
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.modular.expect
index 8f64f636332..a131c6fce86 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.modular.expect
@@ -14,10 +14,10 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
   let final self::C? #t1 = #this in #t1 == null ?{core::String?} null : #t1{self::C}.{self::C::m} = v;
 }
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
   let final self::C? #t2 = #this in #t2 == null ?{core::String?} null : #t2{self::C}.{self::C::m} = "${index}${value}";
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.outline.expect
index 85e2bbfa4c8..cb1b2982f6e 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.outline.expect
@@ -15,9 +15,9 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void
   ;
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.transformed.expect
index 5ee802fe1ee..3f4cf095ed6 100644
--- a/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/nullable_setter.dart.weak.transformed.expect
@@ -14,10 +14,10 @@ extension /* unnamed */ _extension#0 on self::C? {
   operator []= = self::_extension#0|[]=;
   set setter = self::_extension#0|set#setter;
 }
-static method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
+static extension-member method _extension#0|set#setter(lowered final self::C? #this, core::String v) → void {
   let final self::C? #t1 = #this in #t1 == null ?{core::String?} null : #t1{self::C}.{self::C::m} = v;
 }
-static method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
+static extension-member method _extension#0|[]=(lowered final self::C? #this, core::int index, core::String value) → void {
   let final self::C? #t2 = #this in #t2 == null ?{core::String?} null : #t2{self::C}.{self::C::m} = "${index}${value}";
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.expect
index e42706b8906..a4d33063216 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.expect
@@ -617,27 +617,27 @@ static field void topLevelExtensionFunctionTypeGetter = invalid-expression "pkg/
 Try calling using ?.call instead.
     nullableClass.extensionFunctionTypeGetter();
                   ^" in self::Extension|get#extensionFunctionTypeGetter(self::nullableClass)(){() → void};
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   return 0;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   return 0;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   return () → Null {};
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   return () → void {};
 static get nullableFunction() → core::Function?
   return () → Null {};
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.transformed.expect
index 64859bd026c..e3c39eef531 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.strong.transformed.expect
@@ -617,27 +617,27 @@ static field void topLevelExtensionFunctionTypeGetter = invalid-expression "pkg/
 Try calling using ?.call instead.
     nullableClass.extensionFunctionTypeGetter();
                   ^" in self::Extension|get#extensionFunctionTypeGetter(self::nullableClass)(){() → void};
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   return 0;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   return 0;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   return () → Null {};
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   return () → void {};
 static get nullableFunction() → core::Function?
   return () → Null {};
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.expect
index e42706b8906..a4d33063216 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.expect
@@ -617,27 +617,27 @@ static field void topLevelExtensionFunctionTypeGetter = invalid-expression "pkg/
 Try calling using ?.call instead.
     nullableClass.extensionFunctionTypeGetter();
                   ^" in self::Extension|get#extensionFunctionTypeGetter(self::nullableClass)(){() → void};
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   return 0;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   return 0;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   return () → Null {};
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   return () → void {};
 static get nullableFunction() → core::Function?
   return () → Null {};
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.modular.expect
index e42706b8906..a4d33063216 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.modular.expect
@@ -617,27 +617,27 @@ static field void topLevelExtensionFunctionTypeGetter = invalid-expression "pkg/
 Try calling using ?.call instead.
     nullableClass.extensionFunctionTypeGetter();
                   ^" in self::Extension|get#extensionFunctionTypeGetter(self::nullableClass)(){() → void};
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   return 0;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   return 0;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   return () → Null {};
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   return () → void {};
 static get nullableFunction() → core::Function?
   return () → Null {};
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.outline.expect
index 282f08b8f51..eedeee983e6 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.outline.expect
@@ -272,29 +272,29 @@ static field core::int topLevelExtensionFunctionTypeExplicitCall;
 static field () → core::int topLevelExtensionFunctionTypeTearOff;
 static field dynamic topLevelExtensionFunctionGetter;
 static field void topLevelExtensionFunctionTypeGetter;
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   ;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   ;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   ;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void
   ;
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   ;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   ;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void
   ;
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   ;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   ;
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   ;
 static get nullableFunction() → core::Function?
   ;
diff --git a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.transformed.expect
index 64859bd026c..e3c39eef531 100644
--- a/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/potentially_nullable_access.dart.weak.transformed.expect
@@ -617,27 +617,27 @@ static field void topLevelExtensionFunctionTypeGetter = invalid-expression "pkg/
 Try calling using ?.call instead.
     nullableClass.extensionFunctionTypeGetter();
                   ^" in self::Extension|get#extensionFunctionTypeGetter(self::nullableClass)(){() → void};
-static method Extension|+(lowered final self::Class #this, core::int value) → core::int
+static extension-member method Extension|+(lowered final self::Class #this, core::int value) → core::int
   return 0;
-static method Extension|unary-(lowered final self::Class #this) → core::int
+static extension-member method Extension|unary-(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|[](lowered final self::Class #this, core::int index) → core::int
+static extension-member method Extension|[](lowered final self::Class #this, core::int index) → core::int
   return 0;
-static method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
-static method Extension|call(lowered final self::Class #this) → core::int
+static extension-member method Extension|[]=(lowered final self::Class #this, core::int index, core::int value) → void {}
+static extension-member method Extension|call(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#call(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#call(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|call(#this);
-static method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
+static extension-member method Extension|get#extensionProperty(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
-static method Extension|extensionMethod(lowered final self::Class #this) → core::int
+static extension-member method Extension|set#extensionProperty(lowered final self::Class #this, core::int value) → void {}
+static extension-member method Extension|extensionMethod(lowered final self::Class #this) → core::int
   return 0;
-static method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
+static extension-member method Extension|get#extensionMethod(lowered final self::Class #this) → () → core::int
   return () → core::int => self::Extension|extensionMethod(#this);
-static method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
+static extension-member method Extension|get#extensionFunctionGetter(lowered final self::Class #this) → core::Function
   return () → Null {};
-static method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
+static extension-member method Extension|get#extensionFunctionTypeGetter(lowered final self::Class #this) → () → void
   return () → void {};
 static get nullableFunction() → core::Function?
   return () → Null {};
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.expect
index b06358cac6c..86fe442fe0d 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.expect
@@ -325,10 +325,10 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b = true;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.transformed.expect
index b06358cac6c..86fe442fe0d 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.strong.transformed.expect
@@ -325,10 +325,10 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b = true;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.expect
index b06358cac6c..86fe442fe0d 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.expect
@@ -325,10 +325,10 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b = true;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.modular.expect
index b06358cac6c..86fe442fe0d 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.modular.expect
@@ -325,10 +325,10 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b = true;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.outline.expect
index 4d594866ea5..cc65807941a 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.outline.expect
@@ -61,13 +61,13 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   ;
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void
   ;
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   ;
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.transformed.expect
index b06358cac6c..86fe442fe0d 100644
--- a/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/pure_index_expressions.dart.weak.transformed.expect
@@ -325,10 +325,10 @@ extension Extension2 on self::Class2 {
   operator []= = self::Extension2|[]=;
 }
 static field core::bool b = true;
-static method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
+static extension-member method Extension|[](lowered final core::int #this, self::Class cls) → self::Class
   return new self::Class::•();
-static method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
-static method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
+static extension-member method Extension|[]=(lowered final core::int #this, self::Class cls, self::Class value) → void {}
+static extension-member method Extension2|[](lowered final self::Class2 #this, self::Class2 cls) → self::Class2
   return new self::Class2::•();
-static method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
+static extension-member method Extension2|[]=(lowered final self::Class2 #this, self::Class2 cls, self::Class2 value) → void {}
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.expect
index decfa9d1b51..a8cfe4008f8 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.expect
@@ -125,10 +125,10 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   return 42;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   return 42;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic {
   let final core::String #t2 = s in #t2 == null ?{core::int?} null : #t2.{core::String::length}{core::int};
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.transformed.expect
index 833c331730e..c849f9d6f30 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.strong.transformed.expect
@@ -125,10 +125,10 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   return 42;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   return 42;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic {
   let final core::String #t2 = s in #t2 == null ?{core::int?} null : #t2.{core::String::length}{core::int};
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.expect
index decfa9d1b51..a8cfe4008f8 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.expect
@@ -125,10 +125,10 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   return 42;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   return 42;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic {
   let final core::String #t2 = s in #t2 == null ?{core::int?} null : #t2.{core::String::length}{core::int};
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.modular.expect
index decfa9d1b51..a8cfe4008f8 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.modular.expect
@@ -125,10 +125,10 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   return 42;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   return 42;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic {
   let final core::String #t2 = s in #t2 == null ?{core::int?} null : #t2.{core::String::length}{core::int};
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.outline.expect
index e5232ff1f96..b27794d8b55 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.outline.expect
@@ -21,11 +21,11 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   ;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void
   ;
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   ;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.transformed.expect
index 833c331730e..c849f9d6f30 100644
--- a/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/strictly_non_nullable_warnings.dart.weak.transformed.expect
@@ -125,10 +125,10 @@ extension E on core::String {
   operator []= = self::E|[]=;
   operator [] = self::E|[];
 }
-static method E|get#foo(lowered final core::String #this) → core::int
+static extension-member method E|get#foo(lowered final core::String #this) → core::int
   return 42;
-static method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
-static method E|[](lowered final core::String #this, core::int index) → core::int
+static extension-member method E|[]=(lowered final core::String #this, core::int index, core::int value) → void {}
+static extension-member method E|[](lowered final core::String #this, core::int index) → core::int
   return 42;
 static method warning(core::String s, core::List<core::String> l, core::Map<core::String, core::int> m) → dynamic {
   let final core::String #t2 = s in #t2 == null ?{core::int?} null : #t2.{core::String::length}{core::int};
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.expect
index d419af8d451..e44d64310aa 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.expect
@@ -51,9 +51,9 @@ extension E on core::int {
   method m = iss::E|m;
   tearoff m = iss::E|get#m;
 }
-static method E|m(lowered final core::int #this) → core::String
+static extension-member method E|m(lowered final core::int #this) → core::String
   return "m";
-static method E|get#m(lowered final core::int #this) → () → core::String
+static extension-member method E|get#m(lowered final core::int #this) → () → core::String
   return () → core::String => iss::E|m(#this);
 static method f() → core::int?
   return 4;
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.modular.expect
index d419af8d451..e44d64310aa 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.modular.expect
@@ -51,9 +51,9 @@ extension E on core::int {
   method m = iss::E|m;
   tearoff m = iss::E|get#m;
 }
-static method E|m(lowered final core::int #this) → core::String
+static extension-member method E|m(lowered final core::int #this) → core::String
   return "m";
-static method E|get#m(lowered final core::int #this) → () → core::String
+static extension-member method E|get#m(lowered final core::int #this) → () → core::String
   return () → core::String => iss::E|m(#this);
 static method f() → core::int?
   return 4;
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.outline.expect
index c1c492ed51f..aa81f7d43d5 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.outline.expect
@@ -28,9 +28,9 @@ extension E on core::int {
   method m = self2::E|m;
   tearoff m = self2::E|get#m;
 }
-static method E|m(lowered final core::int #this) → core::String
+static extension-member method E|m(lowered final core::int #this) → core::String
   ;
-static method E|get#m(lowered final core::int #this) → () → core::String
+static extension-member method E|get#m(lowered final core::int #this) → () → core::String
   return () → core::String => self2::E|m(#this);
 static method f() → core::int?
   ;
diff --git a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.transformed.expect
index d419af8d451..e44d64310aa 100644
--- a/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/issue42660.dart.weak.transformed.expect
@@ -51,9 +51,9 @@ extension E on core::int {
   method m = iss::E|m;
   tearoff m = iss::E|get#m;
 }
-static method E|m(lowered final core::int #this) → core::String
+static extension-member method E|m(lowered final core::int #this) → core::String
   return "m";
-static method E|get#m(lowered final core::int #this) → () → core::String
+static extension-member method E|get#m(lowered final core::int #this) → () → core::String
   return () → core::String => iss::E|m(#this);
 static method f() → core::int?
   return 4;
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.expect
index d82ba5597d4..1d5d807f739 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.modular.expect
index d82ba5597d4..1d5d807f739 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.modular.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.outline.expect
index 059cce4a328..f6f1494567e 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.outline.expect
@@ -27,21 +27,21 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   ;
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void
   ;
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   ;
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   ;
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void
   ;
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   ;
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.transformed.expect
index d82ba5597d4..1d5d807f739 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_explicit_extension.dart.weak.transformed.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.expect
index 3d82cdd1940..95a725471d7 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.modular.expect
index 3d82cdd1940..95a725471d7 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.modular.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.outline.expect
index 059cce4a328..f6f1494567e 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.outline.expect
@@ -27,21 +27,21 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   ;
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void
   ;
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   ;
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   ;
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void
   ;
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   ;
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   ;
 static method main() → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.transformed.expect
index 3d82cdd1940..95a725471d7 100644
--- a/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/no_null_shorting_extension.dart.weak.transformed.expect
@@ -28,23 +28,23 @@ extension Extension on self::Class* {
   operator unary- = self::Extension|unary-;
   set field = self::Extension|set#field;
 }
-static method Extension|get#field(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|get#field(lowered final self::Class* #this) → self::Class*
   return #this.{self::Class::_field}{self::Class*};
-static method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
+static extension-member method Extension|set#field(lowered final self::Class* #this, self::Class* value) → void {
   #this.{self::Class::_field} = value;
 }
-static method Extension|method(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|method(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
+static extension-member method Extension|get#method(lowered final self::Class* #this) → () →* self::Class*
   return () → self::Class* => self::Extension|method(#this);
-static method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
+static extension-member method Extension|[](lowered final self::Class* #this, self::Class* key) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
+static extension-member method Extension|[]=(lowered final self::Class* #this, self::Class* key, self::Class* value) → void {
   self::Extension|set#field(#this, value);
 }
-static method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
+static extension-member method Extension|+(lowered final self::Class* #this, core::int* value) → self::Class*
   return self::Extension|get#field(#this);
-static method Extension|unary-(lowered final self::Class* #this) → self::Class*
+static extension-member method Extension|unary-(lowered final self::Class* #this) → self::Class*
   return self::Extension|get#field(#this);
 static method main() → dynamic {
   self::propertyAccess(null);
diff --git a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.expect
index 288000a36ff..bfb5103e0f6 100644
--- a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.expect
@@ -8,7 +8,7 @@ import "org-dartlang-testcase:///nullable_extension_on_opt_out_lib.dart";
 extension /* unnamed */ _extension#0 on nul::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final nul::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final nul::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer nul::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.modular.expect
index 288000a36ff..bfb5103e0f6 100644
--- a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.modular.expect
@@ -8,7 +8,7 @@ import "org-dartlang-testcase:///nullable_extension_on_opt_out_lib.dart";
 extension /* unnamed */ _extension#0 on nul::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final nul::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final nul::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer nul::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.outline.expect
index 2431293374d..fe1bb770083 100644
--- a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.outline.expect
@@ -8,7 +8,7 @@ import "org-dartlang-testcase:///nullable_extension_on_opt_out_lib.dart";
 extension /* unnamed */ _extension#0 on nul::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final nul::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final nul::A? #this) → core::String
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.transformed.expect
index 288000a36ff..bfb5103e0f6 100644
--- a/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/nullable_extension_on_opt_out.dart.weak.transformed.expect
@@ -8,7 +8,7 @@ import "org-dartlang-testcase:///nullable_extension_on_opt_out_lib.dart";
 extension /* unnamed */ _extension#0 on nul::A? {
   get text = self::_extension#0|get#text;
 }
-static method _extension#0|get#text(lowered final nul::A? #this) → core::String
+static extension-member method _extension#0|get#text(lowered final nul::A? #this) → core::String
   return "Lily was here";
 static method main() → void {
   has-declared-initializer nul::A? a = null;
diff --git a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.expect b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.expect
index ccde1756d49..285d0a85c10 100644
--- a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.expect
@@ -112,9 +112,9 @@ static method isNotNullOptOut2(core::int* i) → dynamic
   return !(i == null);
 static method ifNullOptOut(core::int* i) → dynamic
   return let final core::int* #t6 = i in #t6 == null ?{core::int*} 42 : #t6;
-static method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
+static extension-member method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
   return index;
-static method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
+static extension-member method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
 static method extensionIfNullOptOut1(core::int* i) → dynamic
   return let final self::OptOutClass1* #t7 = new self::OptOutClass1::•() in let final core::int* #t8 = i in let final core::int* #t9 = self::OptOutExtension|[](#t7, #t8) in #t9 == null ?{core::int*} let final core::int* #t10 = 42 in let final void #t11 = self::OptOutExtension|[]=(#t7, #t8, #t10) in #t10 : #t9;
 static method extensionIfNullOptOut1ForEffect(core::int* i) → dynamic {
@@ -452,9 +452,9 @@ static method isNotNullOptIn2(core::int i) → dynamic
   return !(i == null);
 static method ifNullOptIn(core::int i) → dynamic
   return let final core::int #t40 = i in #t40 == null ?{core::int} 42 : #t40;
-static method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
+static extension-member method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
   return index;
-static method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
+static extension-member method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
 static method extensionIfNullOptIn1(core::int i) → dynamic
   return let final uns::OptInClass1 #t41 = new uns::OptInClass1::•() in let final core::int #t42 = i in let final core::int #t43 = uns::OptInExtension|[](#t41, #t42) in #t43 == null ?{core::int} let final core::int #t44 = 42 in let final void #t45 = uns::OptInExtension|[]=(#t41, #t42, #t44) in #t44 : #t43;
 static method extensionIfNullOptIn1ForEffect(core::int i) → dynamic {
diff --git a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.modular.expect b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.modular.expect
index ccde1756d49..285d0a85c10 100644
--- a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.modular.expect
@@ -112,9 +112,9 @@ static method isNotNullOptOut2(core::int* i) → dynamic
   return !(i == null);
 static method ifNullOptOut(core::int* i) → dynamic
   return let final core::int* #t6 = i in #t6 == null ?{core::int*} 42 : #t6;
-static method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
+static extension-member method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
   return index;
-static method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
+static extension-member method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
 static method extensionIfNullOptOut1(core::int* i) → dynamic
   return let final self::OptOutClass1* #t7 = new self::OptOutClass1::•() in let final core::int* #t8 = i in let final core::int* #t9 = self::OptOutExtension|[](#t7, #t8) in #t9 == null ?{core::int*} let final core::int* #t10 = 42 in let final void #t11 = self::OptOutExtension|[]=(#t7, #t8, #t10) in #t10 : #t9;
 static method extensionIfNullOptOut1ForEffect(core::int* i) → dynamic {
@@ -452,9 +452,9 @@ static method isNotNullOptIn2(core::int i) → dynamic
   return !(i == null);
 static method ifNullOptIn(core::int i) → dynamic
   return let final core::int #t40 = i in #t40 == null ?{core::int} 42 : #t40;
-static method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
+static extension-member method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
   return index;
-static method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
+static extension-member method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
 static method extensionIfNullOptIn1(core::int i) → dynamic
   return let final uns::OptInClass1 #t41 = new uns::OptInClass1::•() in let final core::int #t42 = i in let final core::int #t43 = uns::OptInExtension|[](#t41, #t42) in #t43 == null ?{core::int} let final core::int #t44 = 42 in let final void #t45 = uns::OptInExtension|[]=(#t41, #t42, #t44) in #t44 : #t43;
 static method extensionIfNullOptIn1ForEffect(core::int i) → dynamic {
diff --git a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.outline.expect b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.outline.expect
index 616845cd8c1..14702d7cb7a 100644
--- a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.outline.expect
@@ -106,9 +106,9 @@ static method isNotNullOptOut2(core::int* i) → dynamic
   ;
 static method ifNullOptOut(core::int* i) → dynamic
   ;
-static method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
+static extension-member method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
   ;
-static method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void
+static extension-member method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void
   ;
 static method extensionIfNullOptOut1(core::int* i) → dynamic
   ;
@@ -225,9 +225,9 @@ static method isNotNullOptIn2(core::int i) → dynamic
   ;
 static method ifNullOptIn(core::int i) → dynamic
   ;
-static method OptInExtension|[](lowered final self2::OptInClass1 #this, core::int index) → core::int
+static extension-member method OptInExtension|[](lowered final self2::OptInClass1 #this, core::int index) → core::int
   ;
-static method OptInExtension|[]=(lowered final self2::OptInClass1 #this, core::int index, core::int value) → void
+static extension-member method OptInExtension|[]=(lowered final self2::OptInClass1 #this, core::int index, core::int value) → void
   ;
 static method extensionIfNullOptIn1(core::int i) → dynamic
   ;
diff --git a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.transformed.expect b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.transformed.expect
index 63e6c078fe9..5b9e6e6770b 100644
--- a/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/nnbd_mixed/unsound_checks.dart.weak.transformed.expect
@@ -112,9 +112,9 @@ static method isNotNullOptOut2(core::int* i) → dynamic
   return !(i == null);
 static method ifNullOptOut(core::int* i) → dynamic
   return let final core::int* #t6 = i in #t6 == null ?{core::int*} 42 : #t6;
-static method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
+static extension-member method OptOutExtension|[](lowered final self::OptOutClass1* #this, core::int* index) → core::int*
   return index;
-static method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
+static extension-member method OptOutExtension|[]=(lowered final self::OptOutClass1* #this, core::int* index, core::int* value) → void {}
 static method extensionIfNullOptOut1(core::int* i) → dynamic
   return let final self::OptOutClass1* #t7 = new self::OptOutClass1::•() in let final core::int* #t8 = i in let final core::int* #t9 = self::OptOutExtension|[](#t7, #t8) in #t9 == null ?{core::int*} let final core::int* #t10 = 42 in let final void #t11 = self::OptOutExtension|[]=(#t7, #t8, #t10) in #t10 : #t9;
 static method extensionIfNullOptOut1ForEffect(core::int* i) → dynamic {
@@ -452,9 +452,9 @@ static method isNotNullOptIn2(core::int i) → dynamic
   return !(i == null);
 static method ifNullOptIn(core::int i) → dynamic
   return let final core::int #t40 = i in #t40 == null ?{core::int} 42 : #t40;
-static method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
+static extension-member method OptInExtension|[](lowered final uns::OptInClass1 #this, core::int index) → core::int
   return index;
-static method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
+static extension-member method OptInExtension|[]=(lowered final uns::OptInClass1 #this, core::int index, core::int value) → void {}
 static method extensionIfNullOptIn1(core::int i) → dynamic
   return let final uns::OptInClass1 #t41 = new uns::OptInClass1::•() in let final core::int #t42 = i in let final core::int #t43 = uns::OptInExtension|[](#t41, #t42) in #t43 == null ?{core::int} let final core::int #t44 = 42 in let final void #t45 = uns::OptInExtension|[]=(#t41, #t42, #t44) in #t44 : #t43;
 static method extensionIfNullOptIn1ForEffect(core::int i) → dynamic {
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.strong.expect b/pkg/front_end/testcases/patterns/extension_access.dart.strong.expect
index 5cb0b27d62a..b3f9fdceb84 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.strong.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.strong.expect
@@ -18,9 +18,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   return 87;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   return 42;
 static method method(self::A a) → dynamic
   return block {
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.strong.transformed.expect b/pkg/front_end/testcases/patterns/extension_access.dart.strong.transformed.expect
index 311f61715d6..a7f69635d80 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.strong.transformed.expect
@@ -18,9 +18,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   return 87;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   return 42;
 static method method(self::A a) → dynamic
   return block {
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.weak.expect b/pkg/front_end/testcases/patterns/extension_access.dart.weak.expect
index 199c7761a8c..5b2dfc43983 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.weak.expect
@@ -19,9 +19,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   return 87;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   return 42;
 static method method(self::A a) → dynamic
   return block {
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/extension_access.dart.weak.modular.expect
index 199c7761a8c..5b2dfc43983 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.weak.modular.expect
@@ -19,9 +19,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   return 87;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   return 42;
 static method method(self::A a) → dynamic
   return block {
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.weak.outline.expect b/pkg/front_end/testcases/patterns/extension_access.dart.weak.outline.expect
index ebe8d3ca956..c23f0beb24a 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.weak.outline.expect
@@ -16,9 +16,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   ;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   ;
 static method method(self::A a) → dynamic
   ;
diff --git a/pkg/front_end/testcases/patterns/extension_access.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/extension_access.dart.weak.transformed.expect
index f69a8f5ae7c..2b921338d24 100644
--- a/pkg/front_end/testcases/patterns/extension_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/extension_access.dart.weak.transformed.expect
@@ -19,9 +19,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on self::I {
   get member = self::_extension#1|get#member;
 }
-static method _extension#0|get#member(lowered final self::A #this) → core::int
+static extension-member method _extension#0|get#member(lowered final self::A #this) → core::int
   return 87;
-static method _extension#1|get#member(lowered final self::I #this) → core::int
+static extension-member method _extension#1|get#member(lowered final self::I #this) → core::int
   return 42;
 static method method(self::A a) → dynamic
   return block {
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.expect
index 9648f054784..8b54019e11e 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.expect
@@ -30,7 +30,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter = 0;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
   self::counter = self::counter.{core::num::+}(1){(core::num) → core::int};
   return self::_extension#0|get#member::T% =={core::Type::==}{(core::Object) → core::bool} #C1 ?{core::num} 0.5 : 1.{core::int::unary-}(){() → core::int};
 }
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.transformed.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.transformed.expect
index 37f9cbe41f1..fc9caaeb334 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.strong.transformed.expect
@@ -30,7 +30,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter = 0;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
   self::counter = self::counter.{core::num::+}(1){(core::num) → core::int};
   return self::_extension#0|get#member::T% =={core::Type::==}{(core::Object) → core::bool} #C1 ?{core::num} 0.5 : 1.{core::int::unary-}(){() → core::int};
 }
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.expect
index 0b59edb9210..fe6e0eb0c69 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.expect
@@ -31,7 +31,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter = 0;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
   self::counter = self::counter.{core::num::+}(1){(core::num) → core::int};
   return self::_extension#0|get#member::T% =={core::Type::==}{(core::Object) → core::bool} #C1 ?{core::num} 0.5 : 1.{core::int::unary-}(){() → core::int};
 }
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.modular.expect
index 0b59edb9210..fe6e0eb0c69 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.modular.expect
@@ -31,7 +31,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter = 0;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
   self::counter = self::counter.{core::num::+}(1){(core::num) → core::int};
   return self::_extension#0|get#member::T% =={core::Type::==}{(core::Object) → core::bool} #C1 ?{core::num} 0.5 : 1.{core::int::unary-}(){() → core::int};
 }
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.outline.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.outline.expect
index 73beb86c106..fefe58d865c 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.outline.expect
@@ -18,7 +18,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num
   ;
 static method method1(self::I<core::num> i) → core::num
   ;
diff --git a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.transformed.expect
index 0f728a056fd..dc07a585d65 100644
--- a/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/generic_extension_access.dart.weak.transformed.expect
@@ -31,7 +31,7 @@ extension /* unnamed */ _extension#0<T extends core::Object? = dynamic> on self:
   get member = self::_extension#0|get#member;
 }
 static field core::int counter = 0;
-static method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
+static extension-member method _extension#0|get#member<T extends core::Object? = dynamic>(lowered final self::I<self::_extension#0|get#member::T%> #this) → core::num {
   self::counter = self::counter.{core::num::+}(1){(core::num) → core::int};
   return self::_extension#0|get#member::T% =={core::Type::==}{(core::Object) → core::bool} #C1 ?{core::num} 0.5 : 1.{core::int::unary-}(){() → core::int};
 }
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.strong.expect b/pkg/front_end/testcases/patterns/issue51009.dart.strong.expect
index 0aa2b3f3622..1e8c5ee7ffd 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.strong.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.strong.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   return 42;
 static method main() → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.strong.transformed.expect b/pkg/front_end/testcases/patterns/issue51009.dart.strong.transformed.expect
index 8ee8efad8e0..9729eb0c72e 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.strong.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   return 42;
 static method main() → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.weak.expect b/pkg/front_end/testcases/patterns/issue51009.dart.weak.expect
index 0aa2b3f3622..1e8c5ee7ffd 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.weak.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   return 42;
 static method main() → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/issue51009.dart.weak.modular.expect
index 0aa2b3f3622..1e8c5ee7ffd 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.weak.modular.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   return 42;
 static method main() → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.weak.outline.expect b/pkg/front_end/testcases/patterns/issue51009.dart.weak.outline.expect
index f946bd447ee..001c7433a3f 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.weak.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   ;
 static method main() → void
   ;
diff --git a/pkg/front_end/testcases/patterns/issue51009.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/issue51009.dart.weak.transformed.expect
index 8ee8efad8e0..9729eb0c72e 100644
--- a/pkg/front_end/testcases/patterns/issue51009.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/issue51009.dart.weak.transformed.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 extension /* unnamed */ _extension#0 on core::Object {
   get q = self::_extension#0|get#q;
 }
-static method _extension#0|get#q(lowered final core::Object #this) → core::int
+static extension-member method _extension#0|get#q(lowered final core::Object #this) → core::int
   return 42;
 static method main() → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.strong.expect b/pkg/front_end/testcases/patterns/issue51437.dart.strong.expect
index 43730edc2e2..fcce66da671 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.strong.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.strong.expect
@@ -20,7 +20,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   return #this.{self::A::x}{self::_extension#0|get#g::X%};
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.strong.transformed.expect b/pkg/front_end/testcases/patterns/issue51437.dart.strong.transformed.expect
index 80520f091c4..f561875780e 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.strong.transformed.expect
@@ -20,7 +20,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   return #this.{self::A::x}{self::_extension#0|get#g::X%};
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.weak.expect b/pkg/front_end/testcases/patterns/issue51437.dart.weak.expect
index 43730edc2e2..fcce66da671 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.weak.expect
@@ -20,7 +20,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   return #this.{self::A::x}{self::_extension#0|get#g::X%};
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/issue51437.dart.weak.modular.expect
index 43730edc2e2..fcce66da671 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.weak.modular.expect
@@ -20,7 +20,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   return #this.{self::A::x}{self::_extension#0|get#g::X%};
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.weak.outline.expect b/pkg/front_end/testcases/patterns/issue51437.dart.weak.outline.expect
index 6901b36ea95..36912f3c38d 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.weak.outline.expect
@@ -10,7 +10,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   ;
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void
   ;
diff --git a/pkg/front_end/testcases/patterns/issue51437.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/issue51437.dart.weak.transformed.expect
index 80520f091c4..f561875780e 100644
--- a/pkg/front_end/testcases/patterns/issue51437.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/issue51437.dart.weak.transformed.expect
@@ -20,7 +20,7 @@ class A<X extends core::Object? = dynamic> extends core::Object {
 extension /* unnamed */ _extension#0<X extends core::Object? = dynamic> on self::A<X%> {
   get g = self::_extension#0|get#g;
 }
-static method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
+static extension-member method _extension#0|get#g<X extends core::Object? = dynamic>(lowered final self::A<self::_extension#0|get#g::X%> #this) → self::_extension#0|get#g::X%
   return #this.{self::A::x}{self::_extension#0|get#g::X%};
 static method foo<X extends core::Object? = dynamic>(self::A<self::foo::X%> it) → void {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.strong.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.strong.expect
index 8a163368a95..d20e98b3889 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.strong.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.strong.expect
@@ -176,22 +176,22 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   return true;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   return 0;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   return "42";
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
 static method objectPattern(dynamic o) → dynamic {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.strong.transformed.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.strong.transformed.expect
index 1af4344bf8e..24bc5fcfcd2 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.strong.transformed.expect
@@ -176,22 +176,22 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   return true;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   return 0;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   return "42";
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
 static method objectPattern(dynamic o) → dynamic {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.expect
index c5cc552c9c1..5b6ae92ad5f 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.expect
@@ -177,22 +177,22 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   return true;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   return 0;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   return "42";
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
 static method objectPattern(dynamic o) → dynamic {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.modular.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.modular.expect
index c5cc552c9c1..5b6ae92ad5f 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.modular.expect
@@ -177,22 +177,22 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   return true;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   return 0;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   return "42";
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
 static method objectPattern(dynamic o) → dynamic {
   #L1:
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.outline.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.outline.expect
index 5d62845ec94..9634f532ae3 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.outline.expect
@@ -56,23 +56,23 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   ;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void
   ;
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   ;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   ;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   ;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   ;
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   ;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   ;
 static method objectPattern(dynamic o) → dynamic
   ;
diff --git a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.transformed.expect b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.transformed.expect
index 053c0185ab6..6cc7e103641 100644
--- a/pkg/front_end/testcases/patterns/pattern_types.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/patterns/pattern_types.dart.weak.transformed.expect
@@ -177,22 +177,22 @@ extension /* unnamed */ _extension#2 on core::String {
 extension /* unnamed */ _extension#3 on core::String {
   operator <= = self::_extension#3|<=;
 }
-static method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#extensionGetter(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
-static method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
+static extension-member method _extension#0|extensionMethod(lowered final self::Class #this) → void {}
+static extension-member method _extension#0|get#extensionMethod(lowered final self::Class #this) → () → void
   return () → void => self::_extension#0|extensionMethod(#this);
-static method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
+static extension-member method _extension#0|<=(lowered final self::Class #this, core::int i) → core::bool
   return true;
-static method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
+static extension-member method _extension#0|>=(lowered final self::Class #this, core::int i) → core::int
   return 0;
-static method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
+static extension-member method _extension#0|get#ambiguousField(lowered final self::Class #this) → core::int
   return 42;
-static method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
+static extension-member method _extension#1|get#ambiguousField(lowered final self::Class #this) → core::String
   return "42";
-static method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#2|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
-static method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
+static extension-member method _extension#3|<=(lowered final core::String #this, dynamic other) → core::bool
   return true;
 static method objectPattern(dynamic o) → dynamic {
   #L1:
diff --git a/pkg/front_end/testcases/records/issue50157.dart.strong.expect b/pkg/front_end/testcases/records/issue50157.dart.strong.expect
index 78a11a80de4..ebdcf053cf0 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.strong.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.strong.expect
@@ -30,8 +30,8 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
 static method test(self::A a, ({required foo: core::int}) r) → dynamic {
   a.{self::A::foo}{core::int};
   invalid-expression "pkg/front_end/testcases/records/issue50157.dart:21:5: Error: The setter 'foo' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/records/issue50157.dart.strong.transformed.expect b/pkg/front_end/testcases/records/issue50157.dart.strong.transformed.expect
index 78a11a80de4..ebdcf053cf0 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.strong.transformed.expect
@@ -30,8 +30,8 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
 static method test(self::A a, ({required foo: core::int}) r) → dynamic {
   a.{self::A::foo}{core::int};
   invalid-expression "pkg/front_end/testcases/records/issue50157.dart:21:5: Error: The setter 'foo' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/records/issue50157.dart.weak.expect b/pkg/front_end/testcases/records/issue50157.dart.weak.expect
index 78a11a80de4..ebdcf053cf0 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.weak.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.weak.expect
@@ -30,8 +30,8 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
 static method test(self::A a, ({required foo: core::int}) r) → dynamic {
   a.{self::A::foo}{core::int};
   invalid-expression "pkg/front_end/testcases/records/issue50157.dart:21:5: Error: The setter 'foo' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/records/issue50157.dart.weak.modular.expect b/pkg/front_end/testcases/records/issue50157.dart.weak.modular.expect
index 78a11a80de4..ebdcf053cf0 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.weak.modular.expect
@@ -30,8 +30,8 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
 static method test(self::A a, ({required foo: core::int}) r) → dynamic {
   a.{self::A::foo}{core::int};
   invalid-expression "pkg/front_end/testcases/records/issue50157.dart:21:5: Error: The setter 'foo' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/records/issue50157.dart.weak.outline.expect b/pkg/front_end/testcases/records/issue50157.dart.weak.outline.expect
index 779a086ebf0..f1caef9234b 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.weak.outline.expect
@@ -15,9 +15,9 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void
   ;
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void
   ;
 static method test(self::A a, ({required foo: core::int}) r) → dynamic
   ;
diff --git a/pkg/front_end/testcases/records/issue50157.dart.weak.transformed.expect b/pkg/front_end/testcases/records/issue50157.dart.weak.transformed.expect
index 78a11a80de4..ebdcf053cf0 100644
--- a/pkg/front_end/testcases/records/issue50157.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/records/issue50157.dart.weak.transformed.expect
@@ -30,8 +30,8 @@ extension /* unnamed */ _extension#0 on self::A {
 extension /* unnamed */ _extension#1 on ({required foo: core::int}) {
   set foo = self::_extension#1|set#foo;
 }
-static method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
-static method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
+static extension-member method _extension#0|set#foo(lowered final self::A #this, core::int value) → void {}
+static extension-member method _extension#1|set#foo(lowered final({required foo: core::int}) #this, core::int value) → void {}
 static method test(self::A a, ({required foo: core::int}) r) → dynamic {
   a.{self::A::foo}{core::int};
   invalid-expression "pkg/front_end/testcases/records/issue50157.dart:21:5: Error: The setter 'foo' isn't defined for the class 'A'.
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.strong.expect b/pkg/front_end/testcases/records/null_shorting.dart.strong.expect
index f29031bc884..77b33835353 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.strong.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.strong.expect
@@ -165,12 +165,12 @@ Try calling using ?.call instead.
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t29 = list in #t29 == null ?{() →? void} null : #t29{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.f{() → void}.call;
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t30 = list in #t30 == null ?{() →? void} null : #t30{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.c{self::Class}.{self::Class::call}{() → void};
 }
-static method _extension#0|call(lowered final core::int #this) → void {}
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void {}
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void {}
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void {}
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void {}
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void {}
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.strong.transformed.expect b/pkg/front_end/testcases/records/null_shorting.dart.strong.transformed.expect
index f29031bc884..77b33835353 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.strong.transformed.expect
@@ -165,12 +165,12 @@ Try calling using ?.call instead.
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t29 = list in #t29 == null ?{() →? void} null : #t29{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.f{() → void}.call;
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t30 = list in #t30 == null ?{() →? void} null : #t30{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.c{self::Class}.{self::Class::call}{() → void};
 }
-static method _extension#0|call(lowered final core::int #this) → void {}
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void {}
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void {}
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void {}
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void {}
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void {}
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.weak.expect b/pkg/front_end/testcases/records/null_shorting.dart.weak.expect
index f29031bc884..77b33835353 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.weak.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.weak.expect
@@ -165,12 +165,12 @@ Try calling using ?.call instead.
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t29 = list in #t29 == null ?{() →? void} null : #t29{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.f{() → void}.call;
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t30 = list in #t30 == null ?{() →? void} null : #t30{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.c{self::Class}.{self::Class::call}{() → void};
 }
-static method _extension#0|call(lowered final core::int #this) → void {}
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void {}
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void {}
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void {}
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void {}
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void {}
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.weak.modular.expect b/pkg/front_end/testcases/records/null_shorting.dart.weak.modular.expect
index f29031bc884..77b33835353 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.weak.modular.expect
@@ -165,12 +165,12 @@ Try calling using ?.call instead.
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t29 = list in #t29 == null ?{() →? void} null : #t29{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.f{() → void}.call;
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t30 = list in #t30 == null ?{() →? void} null : #t30{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.c{self::Class}.{self::Class::call}{() → void};
 }
-static method _extension#0|call(lowered final core::int #this) → void {}
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void {}
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void {}
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void {}
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void {}
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void {}
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.weak.outline.expect b/pkg/front_end/testcases/records/null_shorting.dart.weak.outline.expect
index 5827acfadea..9c967df6ac2 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.weak.outline.expect
@@ -22,15 +22,15 @@ extension /* unnamed */ _extension#2 on core::double {
 }
 static method test((core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})? record, core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? list) → dynamic
   ;
-static method _extension#0|call(lowered final core::int #this) → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void
   ;
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void
   ;
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void
   ;
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/null_shorting.dart.weak.transformed.expect b/pkg/front_end/testcases/records/null_shorting.dart.weak.transformed.expect
index f29031bc884..77b33835353 100644
--- a/pkg/front_end/testcases/records/null_shorting.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/records/null_shorting.dart.weak.transformed.expect
@@ -165,12 +165,12 @@ Try calling using ?.call instead.
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t29 = list in #t29 == null ?{() →? void} null : #t29{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.f{() → void}.call;
   let final core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>? #t30 = list in #t30 == null ?{() →? void} null : #t30{core::List<(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})>}.{core::Iterable::first}{(core::int, core::String, {required c: self::Class, required d: core::double, required f: () → void})}.c{self::Class}.{self::Class::call}{() → void};
 }
-static method _extension#0|call(lowered final core::int #this) → void {}
-static method _extension#0|get#call(lowered final core::int #this) → () → void
+static extension-member method _extension#0|call(lowered final core::int #this) → void {}
+static extension-member method _extension#0|get#call(lowered final core::int #this) → () → void
   return () → void => self::_extension#0|call(#this);
-static method _extension#1|call(lowered final core::String #this) → void {}
-static method _extension#1|get#call(lowered final core::String #this) → () → void
+static extension-member method _extension#1|call(lowered final core::String #this) → void {}
+static extension-member method _extension#1|get#call(lowered final core::String #this) → () → void
   return () → void => self::_extension#1|call(#this);
-static method _extension#2|call(lowered final core::double #this) → void {}
-static method _extension#2|get#call(lowered final core::double #this) → () → void
+static extension-member method _extension#2|call(lowered final core::double #this) → void {}
+static extension-member method _extension#2|get#call(lowered final core::double #this) → () → void
   return () → void => self::_extension#2|call(#this);
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.expect
index 306553b3ba0..6ea262c508f 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.expect
@@ -29,7 +29,7 @@ static method method((core::int, {required a: core::String})? r) → dynamic {
     core::String? l7 = let final(core::int, {required a: core::String}) #t4 = r{(core::int, {required a: core::String})} in #t4 == null ?{core::String?} null : #t4.a{core::String};
   }
 }
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   return 0;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   return "";
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.transformed.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.transformed.expect
index 306553b3ba0..6ea262c508f 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.strong.transformed.expect
@@ -29,7 +29,7 @@ static method method((core::int, {required a: core::String})? r) → dynamic {
     core::String? l7 = let final(core::int, {required a: core::String}) #t4 = r{(core::int, {required a: core::String})} in #t4 == null ?{core::String?} null : #t4.a{core::String};
   }
 }
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   return 0;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   return "";
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.expect
index 306553b3ba0..6ea262c508f 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.expect
@@ -29,7 +29,7 @@ static method method((core::int, {required a: core::String})? r) → dynamic {
     core::String? l7 = let final(core::int, {required a: core::String}) #t4 = r{(core::int, {required a: core::String})} in #t4 == null ?{core::String?} null : #t4.a{core::String};
   }
 }
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   return 0;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   return "";
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.modular.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.modular.expect
index 306553b3ba0..6ea262c508f 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.modular.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.modular.expect
@@ -29,7 +29,7 @@ static method method((core::int, {required a: core::String})? r) → dynamic {
     core::String? l7 = let final(core::int, {required a: core::String}) #t4 = r{(core::int, {required a: core::String})} in #t4 == null ?{core::String?} null : #t4.a{core::String};
   }
 }
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   return 0;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   return "";
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.outline.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.outline.expect
index af0bfadb68d..e2c9b6e31c6 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.outline.expect
@@ -8,7 +8,7 @@ extension /* unnamed */ _extension#0 on (core::int, {required a: core::String})?
 }
 static method method((core::int, {required a: core::String})? r) → dynamic
   ;
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   ;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   ;
diff --git a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.transformed.expect b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.transformed.expect
index 306553b3ba0..6ea262c508f 100644
--- a/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/records/nullable_access_extension.dart.weak.transformed.expect
@@ -29,7 +29,7 @@ static method method((core::int, {required a: core::String})? r) → dynamic {
     core::String? l7 = let final(core::int, {required a: core::String}) #t4 = r{(core::int, {required a: core::String})} in #t4 == null ?{core::String?} null : #t4.a{core::String};
   }
 }
-static method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
+static extension-member method _extension#0|get#$1(lowered final(core::int, {required a: core::String})? #this) → core::int
   return 0;
-static method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
+static extension-member method _extension#0|get#a(lowered final(core::int, {required a: core::String})? #this) → core::String
   return "";
diff --git a/pkg/kernel/lib/text/ast_to_text.dart b/pkg/kernel/lib/text/ast_to_text.dart
index 04b536c6f28..4e0701a3cb6 100644
--- a/pkg/kernel/lib/text/ast_to_text.dart
+++ b/pkg/kernel/lib/text/ast_to_text.dart
@@ -1134,6 +1134,8 @@ class Printer extends Visitor<void> with VisitorVoidMixin {
     writeModifier(node.isAbstract, 'abstract');
     writeModifier(node.isForwardingStub, 'forwarding-stub');
     writeModifier(node.isForwardingSemiStub, 'forwarding-semi-stub');
+    writeModifier(node.isExtensionMember, 'extension-member');
+    writeModifier(node.isInlineClassMember, 'inline-class-member');
     switch (node.stubKind) {
       case ProcedureStubKind.Regular:
       case ProcedureStubKind.AbstractForwardingStub:
diff --git a/pkg/kernel/lib/verifier.dart b/pkg/kernel/lib/verifier.dart
index b7a0f8edfaa..1a130284bae 100644
--- a/pkg/kernel/lib/verifier.dart
+++ b/pkg/kernel/lib/verifier.dart
@@ -135,6 +135,10 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
   final List<VariableDeclaration> variableStack = <VariableDeclaration>[];
   final Map<Typedef, TypedefState> typedefState = <Typedef, TypedefState>{};
   final Set<Constant> seenConstants = <Constant>{};
+
+  Map<Reference, ExtensionMemberDescriptor>? _extensionsMembers;
+  Map<Reference, InlineClassMemberDescriptor>? _inlineClassMembers;
+
   bool classTypeParametersAreInScope = false;
 
   /// The compilation stage at which this verification is performed.
@@ -364,6 +368,49 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
     super.visitLibrary(node);
     currentLibrary = null;
     exitTreeNode(node);
+    _extensionsMembers = null;
+    _inlineClassMembers = null;
+  }
+
+  Map<Reference, ExtensionMemberDescriptor> _computeExtensionMembers(
+      Library library) {
+    if (_extensionsMembers == null) {
+      Map<Reference, ExtensionMemberDescriptor> map = _extensionsMembers = {};
+      for (Extension extension in library.extensions) {
+        for (ExtensionMemberDescriptor descriptor in extension.members) {
+          map[descriptor.member] = descriptor;
+          Member member = descriptor.member.asMember;
+          if (!member.isExtensionMember) {
+            problem(
+                member,
+                "Member $member (${descriptor}) from $extension is not marked "
+                "as an extension member.");
+          }
+        }
+      }
+    }
+    return _extensionsMembers!;
+  }
+
+  Map<Reference, InlineClassMemberDescriptor> _computeInlineClassMembers(
+      Library library) {
+    if (_inlineClassMembers == null) {
+      Map<Reference, InlineClassMemberDescriptor> map =
+          _inlineClassMembers = {};
+      for (InlineClass inlineClass in library.inlineClasses) {
+        for (InlineClassMemberDescriptor descriptor in inlineClass.members) {
+          map[descriptor.member] = descriptor;
+          Member member = descriptor.member.asMember;
+          if (!member.isInlineClassMember) {
+            problem(
+                member,
+                "Member $member (${descriptor}) from $inlineClass is not "
+                "marked as an inline class member.");
+          }
+        }
+      }
+    }
+    return _inlineClassMembers!;
   }
 
   @override
@@ -371,6 +418,7 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
     enterTreeNode(node);
     fileUri = checkLocation(node, node.name, node.fileUri);
     currentExtension = node;
+    _computeExtensionMembers(node.enclosingLibrary);
     declareTypeParameters(node.typeParameters);
     final TreeNode? oldParent = enterParent(node);
     node.visitChildren(this);
@@ -385,6 +433,7 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
     enterTreeNode(node);
     fileUri = checkLocation(node, node.name, node.fileUri);
     currentInlineClass = node;
+    _computeInlineClassMembers(node.enclosingLibrary);
     declareTypeParameters(node.typeParameters);
     final TreeNode? oldParent = enterParent(node);
     node.visitChildren(this);
@@ -426,6 +475,30 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
     exitTreeNode(node);
   }
 
+  void _findExtensionMember(Member node) {
+    assert(node.isExtensionMember);
+    Map<Reference, ExtensionMemberDescriptor> extensionMembers =
+        _computeExtensionMembers(node.enclosingLibrary);
+    if (!extensionMembers.containsKey(node.reference)) {
+      problem(
+          node,
+          "Extension member $node is not found in any extension of the "
+          "enclosing library.");
+    }
+  }
+
+  void _findInlineClassMember(Member node) {
+    assert(node.isInlineClassMember);
+    Map<Reference, InlineClassMemberDescriptor> inlineClassMembers =
+        _computeInlineClassMembers(node.enclosingLibrary);
+    if (!inlineClassMembers.containsKey(node.reference)) {
+      problem(
+          node,
+          "Inline class member $node is not found in any inline class of the "
+          "enclosing library.");
+    }
+  }
+
   @override
   void visitField(Field node) {
     enterTreeNode(node);
@@ -462,6 +535,12 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
         }
       }
     }
+    if (node.isExtensionMember) {
+      _findExtensionMember(node);
+    }
+    if (node.isInlineClassMember) {
+      _findInlineClassMember(node);
+    }
     classTypeParametersAreInScope = !node.isStatic;
     node.initializer?.accept(this);
     node.type.accept(this);
@@ -476,6 +555,12 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
   void visitProcedure(Procedure node) {
     enterTreeNode(node);
     fileUri = checkLocation(node, node.name.text, node.fileUri);
+    if (node.isExtensionMember) {
+      _findExtensionMember(node);
+    }
+    if (node.isInlineClassMember) {
+      _findInlineClassMember(node);
+    }
 
     if (node.isRedirectingFactory &&
         node.function.redirectingFactoryTarget == null) {
@@ -563,6 +648,13 @@ class VerifyingVisitor extends RecursiveResultVisitor<void> {
     fileUri = checkLocation(node, node.name.text, node.fileUri);
     currentMember = node;
     classTypeParametersAreInScope = true;
+    if (node.isExtensionMember) {
+      _findExtensionMember(node);
+    }
+    if (node.isInlineClassMember) {
+      _findInlineClassMember(node);
+    }
+
     // The constructor member needs special treatment due to parameters being
     // in scope in the initializer list.
     TreeNode? oldParent = enterParent(node);
diff --git a/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.aot.expect b/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.aot.expect
index 9c80738495c..5a3c525c229 100644
--- a/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.aot.expect
+++ b/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.aot.expect
@@ -23,14 +23,14 @@ static method main() → void {
   let final core::Object #t1 = new core::Object::•() in self::_extension#1|baz(foo);
   _in::reachabilityFence(foo);
 }
-[@vm.unboxing-info.metadata=(b)->i]static method _extension#0|bar([@vm.inferred-type.metadata=#lib::Foo] lowered final ffi::Finalizable #this) → core::int {
+[@vm.unboxing-info.metadata=(b)->i]static extension-member method _extension#0|bar([@vm.inferred-type.metadata=#lib::Foo] lowered final ffi::Finalizable #this) → core::int {
   core::print("123");
   return block {
     final synthesized core::int :expressionValueWrappedFinalizable = 4;
     _in::reachabilityFence(#this);
   } =>:expressionValueWrappedFinalizable;
 }
-[@vm.unboxing-info.metadata=(b)->i]static method _extension#1|baz([@vm.inferred-type.metadata=#lib::Foo] self::Foo foo) → core::int {
+[@vm.unboxing-info.metadata=(b)->i]static extension-member method _extension#1|baz([@vm.inferred-type.metadata=#lib::Foo] self::Foo foo) → core::int {
   core::print("456");
   return block {
     final synthesized core::int :expressionValueWrappedFinalizable = 5;
diff --git a/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.expect b/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.expect
index 15124f2a4d1..65574f28f7a 100644
--- a/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.expect
+++ b/pkg/vm/testcases/transformations/ffi/finalizable_extension_method.dart.expect
@@ -25,14 +25,14 @@ static method main() → void {
   self::_extension#1|baz(new core::Object::•(), foo);
   _in::reachabilityFence(foo);
 }
-static method _extension#0|bar(lowered final ffi::Finalizable #this) → core::int {
+static extension-member method _extension#0|bar(lowered final ffi::Finalizable #this) → core::int {
   core::print("123");
   return block {
     final synthesized core::int :expressionValueWrappedFinalizable = 4;
     _in::reachabilityFence(#this);
   } =>:expressionValueWrappedFinalizable;
 }
-static method _extension#0|get#bar(lowered final ffi::Finalizable #this) → () → core::int
+static extension-member method _extension#0|get#bar(lowered final ffi::Finalizable #this) → () → core::int
   return block {
     final synthesized () → core::int :expressionValueWrappedFinalizable = () → core::int => block {
       final synthesized core::int :expressionValueWrappedFinalizable = self::_extension#0|bar(#this);
@@ -40,14 +40,14 @@ static method _extension#0|get#bar(lowered final ffi::Finalizable #this) → ()
     } =>:expressionValueWrappedFinalizable;
     _in::reachabilityFence(#this);
   } =>:expressionValueWrappedFinalizable;
-static method _extension#1|baz(lowered final core::Object #this, self::Foo foo) → core::int {
+static extension-member method _extension#1|baz(lowered final core::Object #this, self::Foo foo) → core::int {
   core::print("456");
   return block {
     final synthesized core::int :expressionValueWrappedFinalizable = 5;
     _in::reachabilityFence(foo);
   } =>:expressionValueWrappedFinalizable;
 }
-static method _extension#1|get#baz(lowered final core::Object #this) → (self::Foo) → core::int
+static extension-member method _extension#1|get#baz(lowered final core::Object #this) → (self::Foo) → core::int
   return (self::Foo foo) → core::int => block {
     final synthesized core::int :expressionValueWrappedFinalizable = self::_extension#1|baz(#this, foo);
     _in::reachabilityFence(foo);