[cfe] Dot Shorthands: Handle constructor tearoffs.

This CL adds support for constructor tearoffs in dot shorthands. If there's any type parameters on the tearoff and it's a constructor, we produce an error.

I also updated the expectations of existing tests due to an early return of `InvalidExpression`s and added language + cfe tests for the new behavior.

This CL fixes the following co19 tests and is a follow up to https://github.com/dart-lang/co19/issues/3122
co19/LanguageFeatures/Static-access-shorthand/constant_expression_A03_t01
co19/LanguageFeatures/Static-access-shorthand/constant_expression_A04_t01
co19/LanguageFeatures/Static-access-shorthand/semantics_A05_t01
co19/LanguageFeatures/Static-access-shorthand/constant_expression_A03_t02

Bug: https://github.com/dart-lang/sdk/issues/59758, https://github.com/dart-lang/co19/issues/3122
Change-Id: I1ea837342ad818cd3b1de9e422065f42e8a61d6b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419782
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>

pkg/front_end/lib/src/kernel/body_builder.dart

@@ -9323,6 +9323,9 @@ class BodyBuilder extends StackListenerImpl
         pop() as List<TypeBuilder>?; // typeArguments
     if (libraryFeatures.constructorTearoffs.isEnabled) {
       Object? operand = pop();
+      if (operand is DotShorthandPropertyGet && typeArguments != null) {
+        operand.hasTypeParameters = true;
+      }
       if (operand is Generator) {
         push(operand.applyTypeArguments(
             openAngleBracket.charOffset, typeArguments));

pkg/front_end/lib/src/kernel/internal_ast.dart

@@ -3293,7 +3293,14 @@ class DotShorthandPropertyGet extends InternalExpression {
   final Name name;
   final int nameOffset;
 
-  DotShorthandPropertyGet(this.name, {required this.nameOffset});
+  /// Whether this dot shorthand has type parameters.
+  ///
+  /// Used for error checking for constructors with type parameters in the
+  /// [InferenceVisitor].
+  bool hasTypeParameters;
+
+  DotShorthandPropertyGet(this.name,
+      {required this.nameOffset, this.hasTypeParameters = false});
 
   @override
   ExpressionInferenceResult acceptInference(

pkg/front_end/lib/src/type_inference/inference_visitor.dart

@@ -697,6 +697,7 @@ class InferenceVisitorImpl extends InferenceVisitorBase
     ExpressionInferenceResult operandResult = inferExpression(
         node.expression, const UnknownType(),
         isVoidAllowed: true);
+    if (operandResult.expression is InvalidExpression) return operandResult;
     Expression operand = operandResult.expression;
     DartType operandType = operandResult.inferredType;
     if (operandType is! FunctionType) {
@@ -12289,12 +12290,42 @@ class InferenceVisitorImpl extends InferenceVisitorBase
           expressionInferenceResult =
               inferExpression(new StaticGet(member), cachedContext);
         } else {
-          // Tearoff like `Object.new`;
-          expressionInferenceResult =
-              inferExpression(new StaticTearOff(member), cachedContext);
+          // Method tearoffs.
+          DartType type =
+              member.function.computeFunctionType(Nullability.nonNullable);
+          return instantiateTearOff(
+              type, typeContext, new StaticTearOff(member));
         }
       case Constructor():
       case null:
+        // Handle constructor tearoffs.
+        if (cachedContext is TypeDeclarationType) {
+          Member? constructor = findConstructor(
+              cachedContext, node.name, node.fileOffset,
+              isTearoff: true);
+          // Dot shorthand constructor invocations with type parameters
+          // `.id<type>()` are not allowed.
+          if (constructor != null && node.hasTypeParameters) {
+            return new ExpressionInferenceResult(
+                const DynamicType(),
+                helper.buildProblem(
+                    messageDotShorthandsConstructorInvocationWithTypeArguments,
+                    node.nameOffset,
+                    node.name.text.length));
+          }
+          if (constructor is Constructor) {
+            DartType type = constructor.function
+                .computeFunctionType(Nullability.nonNullable);
+            return instantiateTearOff(
+                type, typeContext, new ConstructorTearOff(constructor));
+          } else if (constructor is Procedure) {
+            DartType type = constructor.function
+                .computeFunctionType(Nullability.nonNullable);
+            return instantiateTearOff(
+                type, typeContext, new StaticTearOff(constructor));
+          }
+        }
+
         if (isKnown(cachedContext)) {
           // Error when we can't find the static getter or field [node.name] in
           // the declaration of [cachedContext].

pkg/front_end/lib/src/type_inference/inference_visitor_base.dart

@@ -1148,7 +1148,8 @@ abstract class InferenceVisitorBase implements InferenceVisitor {
   }
 
   /// Finds a constructor of [type] called [name].
-  Member? findConstructor(TypeDeclarationType type, Name name, int fileOffset) {
+  Member? findConstructor(TypeDeclarationType type, Name name, int fileOffset,
+      {bool isTearoff = false}) {
     // TODO(Dart Model team): Seems like an abstraction level issue to require
     // going from `Class` objects back to builders to find a `Member`.
     DeclarationBuilder builder;
@@ -1164,7 +1165,9 @@ abstract class InferenceVisitorBase implements InferenceVisitor {
 
     MemberBuilder? constructorBuilder = builder.findConstructorOrFactory(
         name.text, fileOffset, helper.uri, libraryBuilder);
-    return constructorBuilder?.invokeTarget;
+    return isTearoff
+        ? constructorBuilder?.readTarget
+        : constructorBuilder?.invokeTarget;
   }
 
   /// Finds a member of [receiverType] called [name], and if it is found,

pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart.strong.expect

@@ -179,11 +179,6 @@ library;
 //   Class<int><int>.named<int>;
 //                   ^^^^^
 //
-// pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   Class<int><int>.named<int>;
-//                        ^
-//
 // pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
 //  - 'Type' is from 'dart:core'.
 // Try correcting the operator to an existing operator, or defining a '<' operator.
@@ -276,10 +271,11 @@ Try correcting the name to the name of an existing method, or defining a method
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.
   Class<int><int>.named<int>;
-       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:19: Error: The getter 'named' isn't defined for the class 'List<int>'.
+ - 'List' is from 'dart:core'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named 'named'.
   Class<int><int>.named<int>;
-                       ^");
+                  ^^^^^" in <core::int>[]{<unresolved>}.named);
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.

pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart.strong.modular.expect

@@ -179,11 +179,6 @@ library;
 //   Class<int><int>.named<int>;
 //                   ^^^^^
 //
-// pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   Class<int><int>.named<int>;
-//                        ^
-//
 // pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
 //  - 'Type' is from 'dart:core'.
 // Try correcting the operator to an existing operator, or defining a '<' operator.
@@ -276,10 +271,11 @@ Try correcting the name to the name of an existing method, or defining a method
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.
   Class<int><int>.named<int>;
-       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:19: Error: The getter 'named' isn't defined for the class 'List<int>'.
+ - 'List' is from 'dart:core'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named 'named'.
   Class<int><int>.named<int>;
-                       ^");
+                  ^^^^^" in <core::int>[]{<unresolved>}.named);
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.

pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart.strong.transformed.expect

@@ -179,11 +179,6 @@ library;
 //   Class<int><int>.named<int>;
 //                   ^^^^^
 //
-// pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   Class<int><int>.named<int>;
-//                        ^
-//
 // pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
 //  - 'Type' is from 'dart:core'.
 // Try correcting the operator to an existing operator, or defining a '<' operator.
@@ -276,10 +271,11 @@ Try correcting the name to the name of an existing method, or defining a method
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.
   Class<int><int>.named<int>;
-       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:24: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+       ^" in #C2{<unresolved>}.<(#C3){dynamic}.>(invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:21:19: Error: The getter 'named' isn't defined for the class 'List<int>'.
+ - 'List' is from 'dart:core'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named 'named'.
   Class<int><int>.named<int>;
-                       ^");
+                  ^^^^^" in core::_GrowableList::•<core::int>(0){<unresolved>}.named);
   invalid-expression "pkg/front_end/testcases/constructor_tearoffs/duplicate_instantiation.dart:22:8: Error: The operator '<' isn't defined for the class 'Type'.
  - 'Type' is from 'dart:core'.
 Try correcting the operator to an existing operator, or defining a '<' operator.

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart

@@ -7,8 +7,12 @@ class C {
   C.named();
 }
 
+extension type ET<T>(T v) {}
+
 void test() {
   C newConstructor = .new<int>();
   C namedConstructor = .named<int>();
   C newTearoff = .new<int>;
+  C namedTearoff = .new<int>;
+  ET e = .new<int>;
 }

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.strong.expect

@@ -2,26 +2,30 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C newConstructor = .new<int>();
 //                       ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C namedConstructor = .named<int>();
 //                         ^^^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:19: Error: The static getter or field 'new' isn't defined for the type 'C'.
-//  - 'C' is from 'pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart'.
-// Try correcting the name to the name of an existing static getter or field, or defining a getter or field named 'new'.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
 //   C newTearoff = .new<int>;
 //                   ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   C newTearoff = .new<int>;
-//                      ^
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   C namedTearoff = .new<int>;
+//                     ^^^
+//
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   ET e = .new<int>;
+//           ^^^
 //
 import self as self;
 import "dart:core" as core;
@@ -34,17 +38,36 @@ class C extends core::Object {
     : super core::Object::•()
     ;
 }
+extension type ET<T extends core::Object? = dynamic>(T% v) {
+  abstract extension-type-member representation-field get v() → T%;
+  constructor • = self::ET|constructor#;
+  constructor tearoff • = self::ET|constructor#_#new#tearOff;
+}
+static extension-type-member method ET|constructor#<T extends core::Object? = dynamic>(self::ET|constructor#::T% v) → self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ {
+  lowered final self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ #this = v;
+  return #this;
+}
+static extension-type-member method ET|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET|constructor#_#new#tearOff::T% v) → self::ET<self::ET|constructor#_#new#tearOff::T%>% /* erasure=self::ET|constructor#_#new#tearOff::T%, declared=! */
+  return self::ET|constructor#<self::ET|constructor#_#new#tearOff::T%>(v);
 static method test() → void {
-  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C newConstructor = .new<int>();
                       ^^^" as{TypeError,ForDynamic} self::C;
-  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C namedConstructor = .named<int>();
                         ^^^^^" as{TypeError,ForDynamic} self::C;
-  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
   C newTearoff = .new<int>;
-                     ^";
+                  ^^^" as{TypeError,ForDynamic} self::C;
+  self::C namedTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  C namedTearoff = .new<int>;
+                    ^^^" as{TypeError,ForDynamic} self::C;
+  self::ET<dynamic>% /* erasure=dynamic, declared=! */ e = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  ET e = .new<int>;
+          ^^^" as{TypeError,ForDynamic} self::ET<dynamic>% /* erasure=dynamic, declared=! */;
 }

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.strong.modular.expect

@@ -2,26 +2,30 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C newConstructor = .new<int>();
 //                       ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C namedConstructor = .named<int>();
 //                         ^^^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:19: Error: The static getter or field 'new' isn't defined for the type 'C'.
-//  - 'C' is from 'pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart'.
-// Try correcting the name to the name of an existing static getter or field, or defining a getter or field named 'new'.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
 //   C newTearoff = .new<int>;
 //                   ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   C newTearoff = .new<int>;
-//                      ^
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   C namedTearoff = .new<int>;
+//                     ^^^
+//
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   ET e = .new<int>;
+//           ^^^
 //
 import self as self;
 import "dart:core" as core;
@@ -34,17 +38,36 @@ class C extends core::Object {
     : super core::Object::•()
     ;
 }
+extension type ET<T extends core::Object? = dynamic>(T% v) {
+  abstract extension-type-member representation-field get v() → T%;
+  constructor • = self::ET|constructor#;
+  constructor tearoff • = self::ET|constructor#_#new#tearOff;
+}
+static extension-type-member method ET|constructor#<T extends core::Object? = dynamic>(self::ET|constructor#::T% v) → self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ {
+  lowered final self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ #this = v;
+  return #this;
+}
+static extension-type-member method ET|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET|constructor#_#new#tearOff::T% v) → self::ET<self::ET|constructor#_#new#tearOff::T%>% /* erasure=self::ET|constructor#_#new#tearOff::T%, declared=! */
+  return self::ET|constructor#<self::ET|constructor#_#new#tearOff::T%>(v);
 static method test() → void {
-  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C newConstructor = .new<int>();
                       ^^^" as{TypeError,ForDynamic} self::C;
-  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C namedConstructor = .named<int>();
                         ^^^^^" as{TypeError,ForDynamic} self::C;
-  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
   C newTearoff = .new<int>;
-                     ^";
+                  ^^^" as{TypeError,ForDynamic} self::C;
+  self::C namedTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  C namedTearoff = .new<int>;
+                    ^^^" as{TypeError,ForDynamic} self::C;
+  self::ET<dynamic>% /* erasure=dynamic, declared=! */ e = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  ET e = .new<int>;
+          ^^^" as{TypeError,ForDynamic} self::ET<dynamic>% /* erasure=dynamic, declared=! */;
 }

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.strong.outline.expect

@@ -8,5 +8,14 @@ class C extends core::Object {
   constructor named() → self::C
     ;
 }
+extension type ET<T extends core::Object? = dynamic>(T% v) {
+  abstract extension-type-member representation-field get v() → T%;
+  constructor • = self::ET|constructor#;
+  constructor tearoff • = self::ET|constructor#_#new#tearOff;
+}
+static extension-type-member method ET|constructor#<T extends core::Object? = dynamic>(self::ET|constructor#::T% v) → self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */
+  ;
+static extension-type-member method ET|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET|constructor#_#new#tearOff::T% v) → self::ET<self::ET|constructor#_#new#tearOff::T%>% /* erasure=self::ET|constructor#_#new#tearOff::T%, declared=! */
+  return self::ET|constructor#<self::ET|constructor#_#new#tearOff::T%>(v);
 static method test() → void
   ;

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.strong.transformed.expect

@@ -2,26 +2,30 @@ library;
 //
 // Problems in library:
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C newConstructor = .new<int>();
 //                       ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 // Try adding the class name and type arguments explicitly before the constructor name.
 //   C namedConstructor = .named<int>();
 //                         ^^^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:19: Error: The static getter or field 'new' isn't defined for the type 'C'.
-//  - 'C' is from 'pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart'.
-// Try correcting the name to the name of an existing static getter or field, or defining a getter or field named 'new'.
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
 //   C newTearoff = .new<int>;
 //                   ^^^
 //
-// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   C newTearoff = .new<int>;
-//                      ^
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   C namedTearoff = .new<int>;
+//                     ^^^
+//
+// pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+// Try adding the class name and type arguments explicitly before the constructor name.
+//   ET e = .new<int>;
+//           ^^^
 //
 import self as self;
 import "dart:core" as core;
@@ -34,17 +38,36 @@ class C extends core::Object {
     : super core::Object::•()
     ;
 }
+extension type ET<T extends core::Object? = dynamic>(T% v) {
+  abstract extension-type-member representation-field get v() → T%;
+  constructor • = self::ET|constructor#;
+  constructor tearoff • = self::ET|constructor#_#new#tearOff;
+}
+static extension-type-member method ET|constructor#<T extends core::Object? = dynamic>(self::ET|constructor#::T% v) → self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ {
+  lowered final self::ET<self::ET|constructor#::T%>% /* erasure=self::ET|constructor#::T%, declared=! */ #this = v;
+  return #this;
+}
+static extension-type-member method ET|constructor#_#new#tearOff<T extends core::Object? = dynamic>(self::ET|constructor#_#new#tearOff::T% v) → self::ET<self::ET|constructor#_#new#tearOff::T%>% /* erasure=self::ET|constructor#_#new#tearOff::T%, declared=! */
+  return self::ET|constructor#<self::ET|constructor#_#new#tearOff::T%>(v);
 static method test() → void {
-  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:11:23: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C newConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:23: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C newConstructor = .new<int>();
                       ^^^" as{TypeError,ForDynamic,Unchecked} self::C;
-  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:12:25: Error: A dot shorthand constructor invocation can't have type arguments.
+  self::C namedConstructor = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:14:25: Error: A dot shorthand constructor invocation can't have type arguments.
 Try adding the class name and type arguments explicitly before the constructor name.
   C namedConstructor = .named<int>();
                         ^^^^^" as{TypeError,ForDynamic,Unchecked} self::C;
-  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:13:22: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  self::C newTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:15:19: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
   C newTearoff = .new<int>;
-                     ^";
+                  ^^^" as{TypeError,ForDynamic,Unchecked} self::C;
+  self::C namedTearoff = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:16:21: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  C namedTearoff = .new<int>;
+                    ^^^" as{TypeError,ForDynamic,Unchecked} self::C;
+  self::ET<dynamic>% /* erasure=dynamic, declared=! */ e = invalid-expression "pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart:17:11: Error: A dot shorthand constructor invocation can't have type arguments.
+Try adding the class name and type arguments explicitly before the constructor name.
+  ET e = .new<int>;
+          ^^^" as{TypeError,ForDynamic,Unchecked} self::ET<dynamic>% /* erasure=dynamic, declared=! */;
 }

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.textual_outline.expect

@@ -3,4 +3,6 @@ class C {
   C.named();
 }
 
+extension type ET<T>(T v) {}
+
 void test() {}

pkg/front_end/testcases/dot_shorthands/constructor_type_parameter_error.dart.textual_outline_modelled.expect

@@ -3,4 +3,6 @@ class C {
   C.named();
 }
 
+extension type ET<T>(T v) {}
+
 void test() {}

pkg/front_end/testcases/dot_shorthands/tearoff.dart

@@ -2,6 +2,29 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+class C<T> {
+  static C d<T>() => C<T>();
+  C();
+}
+
+class C1 {
+  @override
+  bool operator ==(Object other) => identical(C1.new, other);
+}
+
+class A1 {
+  bool operator ==(Object other) => identical(ET1.new, other);
+}
+
+extension type ET1(A1 _) implements A1 {}
+
 void main() {
   Object o = .hash;
+  print(C1() == .new);
+  print(ET1(A1()) == .new);
+
+  Object? c = C();
+  if (c is C) {
+    c = .d<int>;
+  }
 }

pkg/front_end/testcases/dot_shorthands/tearoff.dart.strong.expect

@@ -2,10 +2,54 @@ library;
 import self as self;
 import "dart:core" as core;
 
+class C<T extends core::Object? = dynamic> extends core::Object {
+  constructor •() → self::C<self::C::T%>
+    : super core::Object::•()
+    ;
+  static method d<T extends core::Object? = dynamic>() → self::C<dynamic>
+    return new self::C::•<self::C::d::T%>();
+}
+class C1 extends core::Object {
+  synthetic constructor •() → self::C1
+    : super core::Object::•()
+    ;
+  @#C1
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C2, other);
+}
+class A1 extends core::Object {
+  synthetic constructor •() → self::A1
+    : super core::Object::•()
+    ;
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C3, other);
+}
+extension type ET1(self::A1 _) implements self::A1 {
+  abstract extension-type-member representation-field get _() → self::A1;
+  constructor • = self::ET1|constructor#;
+  constructor tearoff • = self::ET1|constructor#_#new#tearOff;
+}
+static extension-type-member method ET1|constructor#(self::A1 _) → self::ET1 /* erasure=self::A1 */ {
+  lowered final self::ET1 /* erasure=self::A1 */ #this = _;
+  return #this;
+}
+static extension-type-member method ET1|constructor#_#new#tearOff(self::A1 _) → self::ET1 /* erasure=self::A1 */
+  return self::ET1|constructor#(_);
 static method main() → void {
-  core::Object o = #C1;
+  core::Object o = #C4;
+  core::print(new self::C1::•() =={self::C1::==}{(core::Object) → core::bool} #C2);
+  core::print(self::ET1|constructor#(new self::A1::•()) =={self::A1::==}{(core::Object) → core::bool} #C3);
+  core::Object? c = new self::C::•<dynamic>();
+  if(c{core::Object} is self::C<dynamic>) {
+    c = #C6;
+  }
 }
 
 constants  {
-  #C1 = static-tearoff core::Object::hash
+  #C1 = core::_Override {}
+  #C2 = constructor-tearoff self::C1::•
+  #C3 = static-tearoff self::ET1|constructor#_#new#tearOff
+  #C4 = static-tearoff core::Object::hash
+  #C5 = static-tearoff self::C::d
+  #C6 = instantiation #C5 <core::int>
 }

pkg/front_end/testcases/dot_shorthands/tearoff.dart.strong.modular.expect

@@ -2,10 +2,54 @@ library;
 import self as self;
 import "dart:core" as core;
 
+class C<T extends core::Object? = dynamic> extends core::Object {
+  constructor •() → self::C<self::C::T%>
+    : super core::Object::•()
+    ;
+  static method d<T extends core::Object? = dynamic>() → self::C<dynamic>
+    return new self::C::•<self::C::d::T%>();
+}
+class C1 extends core::Object {
+  synthetic constructor •() → self::C1
+    : super core::Object::•()
+    ;
+  @#C1
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C2, other);
+}
+class A1 extends core::Object {
+  synthetic constructor •() → self::A1
+    : super core::Object::•()
+    ;
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C3, other);
+}
+extension type ET1(self::A1 _) implements self::A1 {
+  abstract extension-type-member representation-field get _() → self::A1;
+  constructor • = self::ET1|constructor#;
+  constructor tearoff • = self::ET1|constructor#_#new#tearOff;
+}
+static extension-type-member method ET1|constructor#(self::A1 _) → self::ET1 /* erasure=self::A1 */ {
+  lowered final self::ET1 /* erasure=self::A1 */ #this = _;
+  return #this;
+}
+static extension-type-member method ET1|constructor#_#new#tearOff(self::A1 _) → self::ET1 /* erasure=self::A1 */
+  return self::ET1|constructor#(_);
 static method main() → void {
-  core::Object o = #C1;
+  core::Object o = #C4;
+  core::print(new self::C1::•() =={self::C1::==}{(core::Object) → core::bool} #C2);
+  core::print(self::ET1|constructor#(new self::A1::•()) =={self::A1::==}{(core::Object) → core::bool} #C3);
+  core::Object? c = new self::C::•<dynamic>();
+  if(c{core::Object} is self::C<dynamic>) {
+    c = #C6;
+  }
 }
 
 constants  {
-  #C1 = static-tearoff core::Object::hash
+  #C1 = core::_Override {}
+  #C2 = constructor-tearoff self::C1::•
+  #C3 = static-tearoff self::ET1|constructor#_#new#tearOff
+  #C4 = static-tearoff core::Object::hash
+  #C5 = static-tearoff self::C::d
+  #C6 = instantiation #C5 <core::int>
 }

pkg/front_end/testcases/dot_shorthands/tearoff.dart.strong.outline.expect

@@ -1,5 +1,39 @@
 library;
 import self as self;
+import "dart:core" as core;
 
+class C<T extends core::Object? = dynamic> extends core::Object {
+  constructor •() → self::C<self::C::T%>
+    ;
+  static method d<T extends core::Object? = dynamic>() → self::C<dynamic>
+    ;
+}
+class C1 extends core::Object {
+  synthetic constructor •() → self::C1
+    ;
+  @core::override
+  operator ==(core::Object other) → core::bool
+    ;
+}
+class A1 extends core::Object {
+  synthetic constructor •() → self::A1
+    ;
+  operator ==(core::Object other) → core::bool
+    ;
+}
+extension type ET1(self::A1 _) implements self::A1 {
+  abstract extension-type-member representation-field get _() → self::A1;
+  constructor • = self::ET1|constructor#;
+  constructor tearoff • = self::ET1|constructor#_#new#tearOff;
+}
+static extension-type-member method ET1|constructor#(self::A1 _) → self::ET1 /* erasure=self::A1 */
+  ;
+static extension-type-member method ET1|constructor#_#new#tearOff(self::A1 _) → self::ET1 /* erasure=self::A1 */
+  return self::ET1|constructor#(_);
 static method main() → void
   ;
+
+
+Extra constant evaluation status:
+Evaluated: StaticGet @ org-dartlang-testcase:///tearoff.dart:11:4 -> InstanceConstant(const _Override{})
+Extra constant evaluation: evaluated: 3, effectively constant: 1

pkg/front_end/testcases/dot_shorthands/tearoff.dart.strong.transformed.expect

@@ -2,10 +2,54 @@ library;
 import self as self;
 import "dart:core" as core;
 
+class C<T extends core::Object? = dynamic> extends core::Object {
+  constructor •() → self::C<self::C::T%>
+    : super core::Object::•()
+    ;
+  static method d<T extends core::Object? = dynamic>() → self::C<dynamic>
+    return new self::C::•<self::C::d::T%>();
+}
+class C1 extends core::Object {
+  synthetic constructor •() → self::C1
+    : super core::Object::•()
+    ;
+  @#C1
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C2, other);
+}
+class A1 extends core::Object {
+  synthetic constructor •() → self::A1
+    : super core::Object::•()
+    ;
+  operator ==(core::Object other) → core::bool
+    return core::identical(#C3, other);
+}
+extension type ET1(self::A1 _) implements self::A1 {
+  abstract extension-type-member representation-field get _() → self::A1;
+  constructor • = self::ET1|constructor#;
+  constructor tearoff • = self::ET1|constructor#_#new#tearOff;
+}
+static extension-type-member method ET1|constructor#(self::A1 _) → self::ET1 /* erasure=self::A1 */ {
+  lowered final self::ET1 /* erasure=self::A1 */ #this = _;
+  return #this;
+}
+static extension-type-member method ET1|constructor#_#new#tearOff(self::A1 _) → self::ET1 /* erasure=self::A1 */
+  return self::ET1|constructor#(_);
 static method main() → void {
-  core::Object o = #C1;
+  core::Object o = #C4;
+  core::print(new self::C1::•() =={self::C1::==}{(core::Object) → core::bool} #C2);
+  core::print(self::ET1|constructor#(new self::A1::•()) =={self::A1::==}{(core::Object) → core::bool} #C3);
+  core::Object? c = new self::C::•<dynamic>();
+  if(c{core::Object} is self::C<dynamic>) {
+    c = #C6;
+  }
 }
 
 constants  {
-  #C1 = static-tearoff core::Object::hash
+  #C1 = core::_Override {}
+  #C2 = constructor-tearoff self::C1::•
+  #C3 = static-tearoff self::ET1|constructor#_#new#tearOff
+  #C4 = static-tearoff core::Object::hash
+  #C5 = static-tearoff self::C::d
+  #C6 = instantiation #C5 <core::int>
 }

pkg/front_end/testcases/dot_shorthands/tearoff.dart.textual_outline.expect

@@ -1 +1,17 @@
+class C<T> {
+  static C d<T>() => C<T>();
+  C();
+}
+
+class C1 {
+  @override
+  bool operator ==(Object other) => identical(C1.new, other);
+}
+
+class A1 {
+  bool operator ==(Object other) => identical(ET1.new, other);
+}
+
+extension type ET1(A1 _) implements A1 {}
+
 void main() {}

pkg/front_end/testcases/dot_shorthands/tearoff.dart.textual_outline_modelled.expect

@@ -1 +1,17 @@
+class A1 {
+  bool operator ==(Object other) => identical(ET1.new, other);
+}
+
+class C<T> {
+  C();
+  static C d<T>() => C<T>();
+}
+
+class C1 {
+  @override
+  bool operator ==(Object other) => identical(C1.new, other);
+}
+
+extension type ET1(A1 _) implements A1 {}
+
 void main() {}

pkg/front_end/testcases/extension_types/field_access.dart.strong.expect

@@ -261,11 +261,6 @@ library;
 //   var h2 = privateInlineClass._it<int>; // Error
 //                               ^^^
 //
-// pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   var h2 = privateInlineClass._it<int>; // Error
-//                                  ^
-//
 // pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 // Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
 //   var h3 = privateInlineClass._it = 42; // Error
@@ -628,10 +623,10 @@ Try correcting the name to the name of an existing setter, or defining a setter
 Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h1 = privateInlineClass._it; // Error
                               ^^^" in privateInlineClass{<unresolved>}._it;
-  invalid-type h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  dynamic h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:31: Error: The getter '_it' isn't defined for the class 'PrivateInlineClass'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h2 = privateInlineClass._it<int>; // Error
-                                 ^";
+                              ^^^" in privateInlineClass{<unresolved>}._it;
   core::int h3 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
   var h3 = privateInlineClass._it = 42; // Error

pkg/front_end/testcases/extension_types/field_access.dart.strong.modular.expect

@@ -261,11 +261,6 @@ library;
 //   var h2 = privateInlineClass._it<int>; // Error
 //                               ^^^
 //
-// pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   var h2 = privateInlineClass._it<int>; // Error
-//                                  ^
-//
 // pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 // Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
 //   var h3 = privateInlineClass._it = 42; // Error
@@ -628,10 +623,10 @@ Try correcting the name to the name of an existing setter, or defining a setter
 Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h1 = privateInlineClass._it; // Error
                               ^^^" in privateInlineClass{<unresolved>}._it;
-  invalid-type h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  dynamic h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:31: Error: The getter '_it' isn't defined for the class 'PrivateInlineClass'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h2 = privateInlineClass._it<int>; // Error
-                                 ^";
+                              ^^^" in privateInlineClass{<unresolved>}._it;
   core::int h3 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
   var h3 = privateInlineClass._it = 42; // Error

pkg/front_end/testcases/extension_types/field_access.dart.strong.transformed.expect

@@ -261,11 +261,6 @@ library;
 //   var h2 = privateInlineClass._it<int>; // Error
 //                               ^^^
 //
-// pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-// Try changing the operand or remove the type arguments.
-//   var h2 = privateInlineClass._it<int>; // Error
-//                                  ^
-//
 // pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 // Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
 //   var h3 = privateInlineClass._it = 42; // Error
@@ -628,10 +623,10 @@ Try correcting the name to the name of an existing setter, or defining a setter
 Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h1 = privateInlineClass._it; // Error
                               ^^^" in privateInlineClass{<unresolved>}._it;
-  invalid-type h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:34: Error: The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
-Try changing the operand or remove the type arguments.
+  dynamic h2 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:158:31: Error: The getter '_it' isn't defined for the class 'PrivateInlineClass'.
+Try correcting the name to the name of an existing getter, or defining a getter or field named '_it'.
   var h2 = privateInlineClass._it<int>; // Error
-                                 ^";
+                              ^^^" in privateInlineClass{<unresolved>}._it;
   core::int h3 = invalid-expression "pkg/front_end/testcases/extension_types/field_access.dart:159:31: Error: The setter '_it' isn't defined for the class 'PrivateInlineClass'.
 Try correcting the name to the name of an existing setter, or defining a setter or field named '_it'.
   var h3 = privateInlineClass._it = 42; // Error

pkg/front_end/testcases/general/missing_static_super.dart.strong.expect

@@ -203,7 +203,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:15:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:16:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -232,7 +232,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:27:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:28:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -263,7 +263,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:41:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:42:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -292,7 +292,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:53:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:54:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);

pkg/front_end/testcases/general/missing_static_super.dart.strong.modular.expect

@@ -203,7 +203,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:15:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:16:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -232,7 +232,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:27:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:28:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -263,7 +263,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:41:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:42:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -292,7 +292,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:53:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:54:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);

pkg/front_end/testcases/general/missing_static_super.dart.strong.transformed.expect

@@ -203,7 +203,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:15:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:16:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -232,7 +232,7 @@ class Class extends self::Super {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:27:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:28:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -263,7 +263,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:41:11: Error: Superclass has no getter named 'missingSuperMethod'.
     super.missingSuperMethod<int>;
-          ^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:42:11: Error: Superclass has no getter named 'missingSuperIndex'.
     super.missingSuperIndex[42];
           ^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);
@@ -292,7 +292,7 @@ abstract class Mixin extends self::Super /*isMixinDeclaration*/  {
           ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:53:11: Error: Member not found: 'missingStaticMethod'.
     Super.missingStaticMethod<int>;
-          ^^^^^^^^^^^^^^^^^^^"<core::int>;
+          ^^^^^^^^^^^^^^^^^^^";
     invalid-expression "pkg/front_end/testcases/general/missing_static_super.dart:54:11: Error: Member not found: 'missingStaticIndex'.
     Super.missingStaticIndex[42];
           ^^^^^^^^^^^^^^^^^^"{<invalid>}.[](42);

tests/language/dot_shorthands/type_parameter/type_parameter_error_test.dart

@@ -9,6 +9,13 @@
 
 import '../dot_shorthand_helper.dart';
 
+class C {
+  C();
+  C.named();
+}
+
+extension type ET<T>(T v) {}
+
 void main() {
   StaticMember<int> s = .memberType<String, String>('s');
   //                    ^
@@ -31,6 +38,17 @@ void main() {
   //                                                     ^^^
   // [analyzer] unspecified
   // [cfe] The static getter or field 'new' isn't defined for the type 'UnnamedConstructorTypeParameters<dynamic> Function()'.
-  //                                                        ^
-  // [cfe] The static type of the explicit instantiation operand must be a generic function type but is 'dynamic'.
+
+  C newTearoff = .new<int>;
+  //              ^^^
+  // [analyzer] unspecified
+  // [cfe] A dot shorthand constructor invocation can't have type arguments.
+  C namedTearoff = .new<int>;
+  //                ^^^
+  // [analyzer] unspecified
+  // [cfe] A dot shorthand constructor invocation can't have type arguments.
+  ET e = .new<int>;
+  //      ^^^
+  // [analyzer] unspecified
+  // [cfe] A dot shorthand constructor invocation can't have type arguments.
 }