diff --git a/pkg/front_end/lib/src/fragment/factory/encoding.dart b/pkg/front_end/lib/src/fragment/factory/encoding.dart
index 91c2de640e7..058bcc20c11 100644
--- a/pkg/front_end/lib/src/fragment/factory/encoding.dart
+++ b/pkg/front_end/lib/src/fragment/factory/encoding.dart
@@ -310,7 +310,9 @@ class FactoryEncoding implements InferredTypeListener {
       }
       delayedDefaultValueCloners.add(new DelayedDefaultValueCloner(
           target!, _procedure,
-          libraryBuilder: libraryBuilder, identicalSignatures: false));
+          libraryBuilder: libraryBuilder,
+          identicalSignatures: false,
+          isOutlineNode: true));
     }
   }
 
diff --git a/pkg/front_end/lib/src/kernel/body_builder.dart b/pkg/front_end/lib/src/kernel/body_builder.dart
index dd5c7dca0d2..7b68d68a936 100644
--- a/pkg/front_end/lib/src/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/kernel/body_builder.dart
@@ -5517,6 +5517,7 @@ class BodyBuilder extends StackListenerImpl
                 .withArguments(_context.redirectingFactoryTargetName),
             initializer.fileOffset,
             noLength);
+        variable.isErroneouslyInitialized = true;
       } else {
         if (!parameter.initializerWasInferred) {
           variable.initializer = initializer..parent = variable;
diff --git a/pkg/front_end/lib/src/kernel/kernel_helper.dart b/pkg/front_end/lib/src/kernel/kernel_helper.dart
index c0f336b43bc..0054e61c117 100644
--- a/pkg/front_end/lib/src/kernel/kernel_helper.dart
+++ b/pkg/front_end/lib/src/kernel/kernel_helper.dart
@@ -175,12 +175,31 @@ class DelayedDefaultValueCloner {
         VariableDeclaration synthesizedParameter =
             _synthesized.positionalParameters[i];
         if (i < _original.positionalParameters.length) {
-          _cloneInitializer(
-              _original.positionalParameters[i], synthesizedParameter);
+          if (i >= _synthesized.requiredParameterCount) {
+            if (i < _original.requiredParameterCount) {
+              // Coverage-ignore-block(suite): Not run.
+              // Error case: use `null` as initializer.
+              synthesizedParameter.initializer = new NullLiteral()
+                ..parent = synthesizedParameter;
+              if (synthesizedParameter.type.nullability !=
+                  Nullability.nullable) {
+                synthesizedParameter.isErroneouslyInitialized = true;
+              }
+            } else {
+              _cloneInitializer(
+                  _original.positionalParameters[i], synthesizedParameter);
+            }
+          }
         } else {
-          // Error case: use `null` as initializer.
-          synthesizedParameter.initializer = new NullLiteral()
-            ..parent = synthesizedParameter;
+          if (i >= _synthesized.requiredParameterCount) {
+            // Error case: use `null` as initializer.
+            synthesizedParameter.initializer = new NullLiteral()
+              ..parent = synthesizedParameter;
+            if (synthesizedParameter.type.nullability != Nullability.nullable) {
+              // Coverage-ignore-block(suite): Not run.
+              synthesizedParameter.isErroneouslyInitialized = true;
+            }
+          }
         }
       }
       if (_synthesized.namedParameters.isNotEmpty) {
@@ -195,11 +214,20 @@ class DelayedDefaultValueCloner {
           VariableDeclaration? originalParameter =
               originalParameters[synthesizedParameter.name!];
           if (originalParameter != null) {
-            _cloneInitializer(originalParameter, synthesizedParameter);
+            if (!originalParameter.isRequired &&
+                !synthesizedParameter.isRequired) {
+              _cloneInitializer(originalParameter, synthesizedParameter);
+            }
           } else {
-            // Error case: use `null` as initializer.
-            synthesizedParameter.initializer = new NullLiteral()
-              ..parent = synthesizedParameter;
+            if (!synthesizedParameter.isRequired) {
+              // Error case: use `null` as initializer.
+              synthesizedParameter.initializer = new NullLiteral()
+                ..parent = synthesizedParameter;
+              if (synthesizedParameter.type.nullability !=
+                  Nullability.nullable) {
+                synthesizedParameter.isErroneouslyInitialized = true;
+              }
+            }
           }
         }
       }
@@ -214,6 +242,8 @@ class DelayedDefaultValueCloner {
       clonedParameter.initializer = cloner.clone(originalParameter.initializer!)
         ..parent = clonedParameter;
     }
+    clonedParameter.isErroneouslyInitialized |=
+        originalParameter.isErroneouslyInitialized;
   }
 
   void _cloneDefaultValueForSuperParameters(
diff --git a/pkg/front_end/test/coverage_suite_expected.dart b/pkg/front_end/test/coverage_suite_expected.dart
index b16f1af5754..29b71c211a7 100644
--- a/pkg/front_end/test/coverage_suite_expected.dart
+++ b/pkg/front_end/test/coverage_suite_expected.dart
@@ -680,7 +680,7 @@ const Map<String, ({int hitCount, int missCount})> _expect = {
   ),
   // 100.0%.
   "package:front_end/src/kernel/body_builder.dart": (
-    hitCount: 7215,
+    hitCount: 7216,
     missCount: 0,
   ),
   // 100.0%.
@@ -825,7 +825,7 @@ const Map<String, ({int hitCount, int missCount})> _expect = {
   ),
   // 100.0%.
   "package:front_end/src/kernel/kernel_helper.dart": (
-    hitCount: 245,
+    hitCount: 264,
     missCount: 0,
   ),
   // 100.0%.
@@ -1026,7 +1026,7 @@ const Map<String, ({int hitCount, int missCount})> _expect = {
   ),
   // 100.0%.
   "package:front_end/src/source/type_parameter_scope_builder.dart": (
-    hitCount: 1532,
+    hitCount: 1536,
     missCount: 0,
   ),
   // 100.0%.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.expect
index eee8fe353ce..57455088458 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.expect
@@ -54,25 +54,25 @@ abstract class Link<T extends core::Object? = dynamic> extends core::Object {
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:7:28: Error: Expected 0 type arguments.
   factory Link.create2() = LinkFactory<T, T>.create;
                            ^";
-  static factory create3<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::create3::T%>
+  static factory create3<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::create3::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::_#create3#tearOff::T%>
+  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::_#create3#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static factory create4<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::create4::T%>
+  static factory create4<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::create4::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create4({int i}) = LinkFactory.create;
                                   ^";
-  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
+  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.modular.expect
index eee8fe353ce..57455088458 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.modular.expect
@@ -54,25 +54,25 @@ abstract class Link<T extends core::Object? = dynamic> extends core::Object {
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:7:28: Error: Expected 0 type arguments.
   factory Link.create2() = LinkFactory<T, T>.create;
                            ^";
-  static factory create3<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::create3::T%>
+  static factory create3<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::create3::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::_#create3#tearOff::T%>
+  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::_#create3#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static factory create4<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::create4::T%>
+  static factory create4<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::create4::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create4({int i}) = LinkFactory.create;
                                   ^";
-  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
+  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.outline.expect
index 479b188c68c..12777f384f6 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.outline.expect
@@ -61,7 +61,7 @@ abstract class Link<T extends core::Object? = dynamic> extends core::Object {
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static factory create4<T extends core::Object? = dynamic>({core::int i = null}) → self::Link<self::Link::create4::T%>
+  static factory create4<T extends core::Object? = dynamic>({erroneously-initialized core::int i = null}) → self::Link<self::Link::create4::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.transformed.expect
index e2fb060b18f..922f3617ffd 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart.strong.transformed.expect
@@ -54,25 +54,25 @@ abstract class Link<T extends core::Object? = dynamic> extends core::Object {
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:7:28: Error: Expected 0 type arguments.
   factory Link.create2() = LinkFactory<T, T>.create;
                            ^";
-  static factory create3<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::create3::T%>
+  static factory create3<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::create3::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i = #C1) → self::Link<self::Link::_#create3#tearOff::T%>
+  static synthetic method _#create3#tearOff<T extends core::Object? = dynamic>(core::int i) → self::Link<self::Link::_#create3#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:8:33: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function(int)'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create3(int i) = LinkFactory.create;
                                 ^";
-  static factory create4<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::create4::T%>
+  static factory create4<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::create4::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
   factory Link.create4({int i}) = LinkFactory.create;
                                   ^";
-  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
+  static synthetic method _#create4#tearOff<T extends core::Object? = dynamic>({erroneously-initialized core::int i = #C1}) → self::Link<self::Link::_#create4#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart:9:35: Error: The constructor function type 'LinkFactory Function()' isn't a subtype of 'Link<T> Function({int i})'.
  - 'LinkFactory' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
  - 'Link' is from 'pkg/front_end/testcases/constructor_tearoffs/lowering/invalid_redirect.dart'.
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.expect
index 19155069730..5a9dde896a2 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.expect
@@ -60,9 +60,9 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     return new self::Class::•<self::Class::fact::T%>(field);
   static synthetic method _#fact#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#fact#tearOff::T%>
     return self::Class::fact<self::Class::_#fact#tearOff::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
-  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
+  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
     return new self::Class::•<self::Class::_#redirectingFactory#tearOff::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.modular.expect
index 19155069730..5a9dde896a2 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.modular.expect
@@ -60,9 +60,9 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     return new self::Class::•<self::Class::fact::T%>(field);
   static synthetic method _#fact#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#fact#tearOff::T%>
     return self::Class::fact<self::Class::_#fact#tearOff::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
-  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
+  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
     return new self::Class::•<self::Class::_#redirectingFactory#tearOff::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.transformed.expect
index b849bf1765c..374dedec1ea 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/named_mixin_application.dart.strong.transformed.expect
@@ -60,9 +60,9 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     return new self::Class::•<self::Class::fact::T%>(field);
   static synthetic method _#fact#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#fact#tearOff::T%>
     return self::Class::fact<self::Class::_#fact#tearOff::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
-  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
+  static synthetic method _#redirectingFactory#tearOff<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::_#redirectingFactory#tearOff::T%>
     return new self::Class::•<self::Class::_#redirectingFactory#tearOff::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values.dart.strong.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values.dart.strong.outline.expect
index a0f8634e919..39cf91a2883 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values.dart.strong.outline.expect
@@ -8,7 +8,7 @@ class Class1 extends core::Object {
     ;
   static synthetic method _#_#tearOff([has-declared-initializer core::int field]) → self::Class1
     return new self::Class1::_(field);
-  static factory •([core::int field = null]) → self::Class1 /* redirection-target: self::Class1::_ */
+  static factory •([core::int field = 42]) → self::Class1 /* redirection-target: self::Class1::_ */
     return new self::Class1::_(field);
   static synthetic method _#new#tearOff([core::int field]) → self::Class1
     return new self::Class1::_(field);
@@ -19,7 +19,7 @@ class Class2 extends core::Object {
     ;
   static synthetic method _#_#tearOff({has-declared-initializer core::int field}) → self::Class2
     return new self::Class2::_(field: field);
-  static factory •({core::int field = null}) → self::Class2 /* redirection-target: self::Class2::_ */
+  static factory •({core::int field = 42}) → self::Class2 /* redirection-target: self::Class2::_ */
     return new self::Class2::_(field: field);
   static synthetic method _#new#tearOff({core::int field}) → self::Class2
     return new self::Class2::_(field: field);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values_complex.dart.strong.outline.expect b/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values_complex.dart.strong.outline.expect
index ab2bd73d844..4fc2b827e5d 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values_complex.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/lowering/redirecting_factory_tear_off_default_values_complex.dart.strong.outline.expect
@@ -11,11 +11,11 @@ class Class1 extends core::Object {
     ;
   static synthetic method _#positional#tearOff([has-declared-initializer core::int field1, has-declared-initializer core::int field2]) → self::Class1
     return new self::Class1::positional(field1, field2);
-  static factory redirectPositionalSame([core::int field1 = null, core::int field2 = null]) → self::Class1 /* redirection-target: self::Class1::positional */
+  static factory redirectPositionalSame([core::int field1 = 1, core::int field2 = 2]) → self::Class1 /* redirection-target: self::Class1::positional */
     return new self::Class1::positional(field1, field2);
   static synthetic method _#redirectPositionalSame#tearOff([core::int field1, core::int field2]) → self::Class1
     return new self::Class1::positional(field1, field2);
-  static factory redirectPositionalFewer1([core::int field1 = null]) → self::Class1 /* redirection-target: self::Class1::positional */
+  static factory redirectPositionalFewer1([core::int field1 = 1]) → self::Class1 /* redirection-target: self::Class1::positional */
     return new self::Class1::positional(field1);
   static synthetic method _#redirectPositionalFewer1#tearOff([core::int field1]) → self::Class1
     return new self::Class1::positional(field1);
@@ -25,19 +25,19 @@ class Class1 extends core::Object {
     return new self::Class1::positional();
   static synthetic method _#named#tearOff({has-declared-initializer core::int field1, has-declared-initializer core::int field2}) → self::Class1
     return new self::Class1::named(field1: field1, field2: field2);
-  static factory redirectNamedSame({core::int field1 = null, core::int field2 = null}) → self::Class1 /* redirection-target: self::Class1::named */
+  static factory redirectNamedSame({core::int field1 = 1, core::int field2 = 2}) → self::Class1 /* redirection-target: self::Class1::named */
     return new self::Class1::named(field1: field1, field2: field2);
   static synthetic method _#redirectNamedSame#tearOff({core::int field1, core::int field2}) → self::Class1
     return new self::Class1::named(field1: field1, field2: field2);
-  static factory redirectNamedReorder({core::int field2 = null, core::int field1 = null}) → self::Class1 /* redirection-target: self::Class1::named */
+  static factory redirectNamedReorder({core::int field2 = 2, core::int field1 = 1}) → self::Class1 /* redirection-target: self::Class1::named */
     return new self::Class1::named(field2: field2, field1: field1);
   static synthetic method _#redirectNamedReorder#tearOff({core::int field2, core::int field1}) → self::Class1
     return new self::Class1::named(field2: field2, field1: field1);
-  static factory redirectNamedFewer1({core::int field1 = null}) → self::Class1 /* redirection-target: self::Class1::named */
+  static factory redirectNamedFewer1({core::int field1 = 1}) → self::Class1 /* redirection-target: self::Class1::named */
     return new self::Class1::named(field1: field1);
   static synthetic method _#redirectNamedFewer1#tearOff({core::int field1}) → self::Class1
     return new self::Class1::named(field1: field1);
-  static factory redirectNamedFewer2({core::int field2 = null}) → self::Class1 /* redirection-target: self::Class1::named */
+  static factory redirectNamedFewer2({core::int field2 = 2}) → self::Class1 /* redirection-target: self::Class1::named */
     return new self::Class1::named(field2: field2);
   static synthetic method _#redirectNamedFewer2#tearOff({core::int field2}) → self::Class1
     return new self::Class1::named(field2: field2);
diff --git a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.expect b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.expect
index f1d2fd40f69..292bffe8c93 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.expect
@@ -52,7 +52,7 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     ;
   static factory fact<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::fact::T%>
     return new self::Class::•<self::Class::fact::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.modular.expect b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.modular.expect
index f1d2fd40f69..292bffe8c93 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.modular.expect
@@ -52,7 +52,7 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     ;
   static factory fact<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::fact::T%>
     return new self::Class::•<self::Class::fact::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.transformed.expect b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.transformed.expect
index 9932670fb54..8f13425b4ef 100644
--- a/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/constructor_tearoffs/named_mixin_application.dart.strong.transformed.expect
@@ -52,7 +52,7 @@ class Class<T extends core::Object? = dynamic> extends core::Object implements s
     ;
   static factory fact<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::fact::T%>
     return new self::Class::•<self::Class::fact::T%>(field);
-  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field = #C1) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
+  static factory redirectingFactory<T extends core::Object? = dynamic>(core::int field) → self::Class<self::Class::redirectingFactory::T%> /* redirection-target: self::Class::•<self::Class::redirectingFactory::T%>*/
     return new self::Class::•<self::Class::redirectingFactory::T%>(field);
 }
 abstract class Mixin<S extends core::Object? = dynamic> extends core::Object /*isMixinDeclaration*/  {
diff --git a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.expect b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.expect
index 23807c3cded..c104e78d26e 100644
--- a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.expect
+++ b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.expect
@@ -20,13 +20,13 @@ class A<T extends core::Object? = dynamic> extends core::Object implements self:
     return new self::A::•<self::A::_#new#tearOff::T%>();
 }
 class B<T extends core::Object? = dynamic> extends core::Object {
-  static factory test05<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::test05::T%>
+  static factory test05<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::test05::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
   factory B.test05(int incompatible) = A<T>;
                                        ^";
-  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::_#test05#tearOff::T%>
+  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::_#test05#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
@@ -40,7 +40,3 @@ static method test() → dynamic {
   factory B.test05(int incompatible) = A<T>;
                                        ^";
 }
-
-constants  {
-  #C1 = null
-}
diff --git a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.modular.expect b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.modular.expect
index 23807c3cded..c104e78d26e 100644
--- a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.modular.expect
@@ -20,13 +20,13 @@ class A<T extends core::Object? = dynamic> extends core::Object implements self:
     return new self::A::•<self::A::_#new#tearOff::T%>();
 }
 class B<T extends core::Object? = dynamic> extends core::Object {
-  static factory test05<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::test05::T%>
+  static factory test05<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::test05::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
   factory B.test05(int incompatible) = A<T>;
                                        ^";
-  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::_#test05#tearOff::T%>
+  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::_#test05#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
@@ -40,7 +40,3 @@ static method test() → dynamic {
   factory B.test05(int incompatible) = A<T>;
                                        ^";
 }
-
-constants  {
-  #C1 = null
-}
diff --git a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.transformed.expect b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.transformed.expect
index 23807c3cded..c104e78d26e 100644
--- a/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/dart2js/invalid_redirection.dart.strong.transformed.expect
@@ -20,13 +20,13 @@ class A<T extends core::Object? = dynamic> extends core::Object implements self:
     return new self::A::•<self::A::_#new#tearOff::T%>();
 }
 class B<T extends core::Object? = dynamic> extends core::Object {
-  static factory test05<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::test05::T%>
+  static factory test05<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::test05::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
   factory B.test05(int incompatible) = A<T>;
                                        ^";
-  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible = #C1) → self::B<self::B::_#test05#tearOff::T%>
+  static synthetic method _#test05#tearOff<T extends core::Object? = dynamic>(core::int incompatible) → self::B<self::B::_#test05#tearOff::T%>
     return invalid-expression "pkg/front_end/testcases/dart2js/invalid_redirection.dart:13:40: Error: The constructor function type 'A<T> Function()' isn't a subtype of 'B<T> Function(int)'.
  - 'A' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
  - 'B' is from 'pkg/front_end/testcases/dart2js/invalid_redirection.dart'.
@@ -40,7 +40,3 @@ static method test() → dynamic {
   factory B.test05(int incompatible) = A<T>;
                                        ^";
 }
-
-constants  {
-  #C1 = null
-}
diff --git a/pkg/front_end/testcases/dart2js/tear_off_patch/main.dart.strong.outline.expect b/pkg/front_end/testcases/dart2js/tear_off_patch/main.dart.strong.outline.expect
index f55d2e8d154..282557331cd 100644
--- a/pkg/front_end/testcases/dart2js/tear_off_patch/main.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/dart2js/tear_off_patch/main.dart.strong.outline.expect
@@ -28,12 +28,12 @@ class Class<T extends core::Object? = dynamic> extends core::Object {
   static synthetic method /* from org-dartlang-testcase:///patch_lib.dart */ _#fact#tearOff<T extends core::Object? = dynamic>({has-declared-initializer core::bool defaultValue, required self2::Class::_#fact#tearOff::T% value}) → self2::Class<self2::Class::_#fact#tearOff::T%>
     return self2::Class::fact<self2::Class::_#fact#tearOff::T%>(defaultValue: defaultValue, value: value);
   @_in::patch
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect<T extends core::Object? = dynamic>({core::bool defaultValue = null, required self2::Class::redirect::T% value}) → self2::Class<self2::Class::redirect::T%> /* redirection-target: self2::ClassImpl::•<self2::Class::redirect::T%>*/
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect<T extends core::Object? = dynamic>({core::bool defaultValue = true, required self2::Class::redirect::T% value}) → self2::Class<self2::Class::redirect::T%> /* redirection-target: self2::ClassImpl::•<self2::Class::redirect::T%>*/
     return new self2::ClassImpl::•<self2::Class::redirect::T%>(defaultValue: defaultValue, value: value);
   static synthetic method /* from org-dartlang-testcase:///patch_lib.dart */ _#redirect#tearOff<T extends core::Object? = dynamic>({core::bool defaultValue, required self2::Class::_#redirect#tearOff::T% value}) → self2::Class<self2::Class::_#redirect#tearOff::T%>
     return new self2::ClassImpl::•<self2::Class::_#redirect#tearOff::T%>(defaultValue: defaultValue, value: value);
   @_in::patch
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect2<T extends core::Object? = dynamic>({core::bool defaultValue = null, required self2::Class::redirect2::T% value}) → self2::Class<self2::Class::redirect2::T%> /* redirection-target: self2::ClassImpl::patched<self2::Class::redirect2::T%>*/
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect2<T extends core::Object? = dynamic>({core::bool defaultValue = true, required self2::Class::redirect2::T% value}) → self2::Class<self2::Class::redirect2::T%> /* redirection-target: self2::ClassImpl::patched<self2::Class::redirect2::T%>*/
     return new self2::ClassImpl::patched<self2::Class::redirect2::T%>(defaultValue: defaultValue, value: value);
   static synthetic method /* from org-dartlang-testcase:///patch_lib.dart */ _#redirect2#tearOff<T extends core::Object? = dynamic>({core::bool defaultValue, required self2::Class::_#redirect2#tearOff::T% value}) → self2::Class<self2::Class::_#redirect2#tearOff::T%>
     return new self2::ClassImpl::patched<self2::Class::_#redirect2#tearOff::T%>(defaultValue: defaultValue, value: value);
diff --git a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.expect b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.expect
index 05221d76446..4ab9004a0c3 100644
--- a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.expect
+++ b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.expect
@@ -98,7 +98,7 @@ class E extends core::_Enum /*isEnum*/  {
                    ^";
   static factory f5() → self::E /* redirection-target: self::E::f */
     return self::E::f();
-  static factory f6(core::int value = #C7) → self::E
+  static factory f6(core::int value) → self::E
     return invalid-expression "pkg/front_end/testcases/enhanced_enums/constructor_calls.dart:28:29: Error: The constructor function type 'E Function()' isn't a subtype of 'E Function(int)'.
  - 'E' is from 'pkg/front_end/testcases/enhanced_enums/constructor_calls.dart'.
   factory E.f6(int value) = E.f; // Error.
@@ -128,7 +128,7 @@ static method test() → dynamic {
 Try using a constructor or factory that is 'const'.
   const E.f(); // Error.
         ^";
-  #C8;
+  #C7;
 }
 static method main() → dynamic {}
 
@@ -139,8 +139,7 @@ constants  {
   #C4 = 1
   #C5 = "two"
   #C6 = self::E {index:#C4, _name:#C5}
-  #C7 = null
-  #C8 = constructor-tearoff self::E::f
+  #C7 = constructor-tearoff self::E::f
 }
 
 
diff --git a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.modular.expect b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.modular.expect
index 05221d76446..4ab9004a0c3 100644
--- a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.modular.expect
@@ -98,7 +98,7 @@ class E extends core::_Enum /*isEnum*/  {
                    ^";
   static factory f5() → self::E /* redirection-target: self::E::f */
     return self::E::f();
-  static factory f6(core::int value = #C7) → self::E
+  static factory f6(core::int value) → self::E
     return invalid-expression "pkg/front_end/testcases/enhanced_enums/constructor_calls.dart:28:29: Error: The constructor function type 'E Function()' isn't a subtype of 'E Function(int)'.
  - 'E' is from 'pkg/front_end/testcases/enhanced_enums/constructor_calls.dart'.
   factory E.f6(int value) = E.f; // Error.
@@ -128,7 +128,7 @@ static method test() → dynamic {
 Try using a constructor or factory that is 'const'.
   const E.f(); // Error.
         ^";
-  #C8;
+  #C7;
 }
 static method main() → dynamic {}
 
@@ -139,8 +139,7 @@ constants  {
   #C4 = 1
   #C5 = "two"
   #C6 = self::E {index:#C4, _name:#C5}
-  #C7 = null
-  #C8 = constructor-tearoff self::E::f
+  #C7 = constructor-tearoff self::E::f
 }
 
 
diff --git a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.transformed.expect b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.transformed.expect
index 05221d76446..4ab9004a0c3 100644
--- a/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/enhanced_enums/constructor_calls.dart.strong.transformed.expect
@@ -98,7 +98,7 @@ class E extends core::_Enum /*isEnum*/  {
                    ^";
   static factory f5() → self::E /* redirection-target: self::E::f */
     return self::E::f();
-  static factory f6(core::int value = #C7) → self::E
+  static factory f6(core::int value) → self::E
     return invalid-expression "pkg/front_end/testcases/enhanced_enums/constructor_calls.dart:28:29: Error: The constructor function type 'E Function()' isn't a subtype of 'E Function(int)'.
  - 'E' is from 'pkg/front_end/testcases/enhanced_enums/constructor_calls.dart'.
   factory E.f6(int value) = E.f; // Error.
@@ -128,7 +128,7 @@ static method test() → dynamic {
 Try using a constructor or factory that is 'const'.
   const E.f(); // Error.
         ^";
-  #C8;
+  #C7;
 }
 static method main() → dynamic {}
 
@@ -139,8 +139,7 @@ constants  {
   #C4 = 1
   #C5 = "two"
   #C6 = self::E {index:#C4, _name:#C5}
-  #C7 = null
-  #C8 = constructor-tearoff self::E::f
+  #C7 = constructor-tearoff self::E::f
 }
 
 
diff --git a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.expect b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.expect
index 34ebc4937b6..8e14e8f8c5a 100644
--- a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.expect
@@ -86,19 +86,19 @@ static extension-type-member synthetic method E|constructor#_#redirNotEnough#tea
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:6:32: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function()'.
   factory E.redirNotEnough() = E; // Error.
                                ^";
-static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
@@ -110,12 +110,12 @@ static extension-type-member synthetic method E|constructor#_#redirTooMany3#tear
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:10:53: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, [dynamic])'.
   factory E.redirTooMany3(int foo, [dynamic bar]) = E; // Error.
                                                     ^";
-static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
                                                             ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
diff --git a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.modular.expect b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.modular.expect
index 34ebc4937b6..8e14e8f8c5a 100644
--- a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.modular.expect
@@ -86,19 +86,19 @@ static extension-type-member synthetic method E|constructor#_#redirNotEnough#tea
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:6:32: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function()'.
   factory E.redirNotEnough() = E; // Error.
                                ^";
-static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
@@ -110,12 +110,12 @@ static extension-type-member synthetic method E|constructor#_#redirTooMany3#tear
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:10:53: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, [dynamic])'.
   factory E.redirTooMany3(int foo, [dynamic bar]) = E; // Error.
                                                     ^";
-static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
                                                             ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
diff --git a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.transformed.expect b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.transformed.expect
index 34ebc4937b6..8e14e8f8c5a 100644
--- a/pkg/front_end/testcases/extension_types/issue53209.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/issue53209.dart.strong.transformed.expect
@@ -86,19 +86,19 @@ static extension-type-member synthetic method E|constructor#_#redirNotEnough#tea
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:6:32: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function()'.
   factory E.redirNotEnough() = E; // Error.
                                ^";
-static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany1(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany1#tearOff(core::int foo, core::String bar) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:8:50: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String)'.
   factory E.redirTooMany1(int foo, String bar) = E; // Error.
                                                  ^";
-static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany2(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar = #C1, core::num baz = #C1) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany2#tearOff(core::int foo, core::String bar, core::num baz) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:9:59: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, String, num)'.
   factory E.redirTooMany2(int foo, String bar, num baz) = E; // Error.
                                                           ^";
@@ -110,12 +110,12 @@ static extension-type-member synthetic method E|constructor#_#redirTooMany3#tear
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:10:53: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, [dynamic])'.
   factory E.redirTooMany3(int foo, [dynamic bar]) = E; // Error.
                                                     ^";
-static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member method E|constructor#redirTooMany4(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
                                                             ^";
-static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#redirTooMany4#tearOff(core::int foo, {required core::Object bar}) → self::E% /* erasure=core::int, declared=! */
   return invalid-expression "pkg/front_end/testcases/extension_types/issue53209.dart:11:61: Error: The constructor function type 'E Function(int)' isn't a subtype of 'E Function(int, {Object bar})'.
  - 'Object' is from 'dart:core'.
   factory E.redirTooMany4(int foo, {required Object bar}) = E; // Error.
diff --git a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.expect b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.expect
index 45c6677872b..d5077ec8813 100644
--- a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.expect
+++ b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.expect
@@ -44,13 +44,13 @@ static extension-type-member method E|constructor#testPositional([erroneously-in
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([core::int x = #C1, core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([erroneously-initialized core::int x = #C1, erroneously-initialized core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testPositional(x, y);
 static extension-type-member method E|constructor#testNamed({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */ {
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({core::int x = #C1, core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testNamed(x: x, y: y);
 
 constants  {
diff --git a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.modular.expect b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.modular.expect
index 45c6677872b..d5077ec8813 100644
--- a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.modular.expect
@@ -44,13 +44,13 @@ static extension-type-member method E|constructor#testPositional([erroneously-in
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([core::int x = #C1, core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([erroneously-initialized core::int x = #C1, erroneously-initialized core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testPositional(x, y);
 static extension-type-member method E|constructor#testNamed({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */ {
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({core::int x = #C1, core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testNamed(x: x, y: y);
 
 constants  {
diff --git a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.transformed.expect b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.transformed.expect
index 45c6677872b..d5077ec8813 100644
--- a/pkg/front_end/testcases/extension_types/issue56402.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/extension_types/issue56402.dart.strong.transformed.expect
@@ -44,13 +44,13 @@ static extension-type-member method E|constructor#testPositional([erroneously-in
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([core::int x = #C1, core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testPositional#tearOff([erroneously-initialized core::int x = #C1, erroneously-initialized core::int y = #C1]) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testPositional(x, y);
 static extension-type-member method E|constructor#testNamed({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */ {
   lowered final self::E% /* erasure=core::int, declared=! */ #this = x;
   return #this;
 }
-static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({core::int x = #C1, core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
+static extension-type-member synthetic method E|constructor#_#testNamed#tearOff({erroneously-initialized core::int x = #C1, erroneously-initialized core::String y = #C1}) → self::E% /* erasure=core::int, declared=! */
   return self::E|constructor#testNamed(x: x, y: y);
 
 constants  {
diff --git a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.expect b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.expect
index 2461e05bd1c..78de2b2ed82 100644
--- a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.expect
+++ b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.expect
@@ -36,7 +36,7 @@ class Class extends core::Object /*hasConstConstructor*/  {
   static factory /* from org-dartlang-testcase:///patch_lib.dart */ constFact({core::bool defaultValue = #C3}) → test::Class
     return throw "unsupported";
   @#C1
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({erroneously-initialized core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
     return new test::Class::_internal(defaultValue: defaultValue);
 }
 
diff --git a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.modular.expect b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.modular.expect
index 2461e05bd1c..78de2b2ed82 100644
--- a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.modular.expect
@@ -36,7 +36,7 @@ class Class extends core::Object /*hasConstConstructor*/  {
   static factory /* from org-dartlang-testcase:///patch_lib.dart */ constFact({core::bool defaultValue = #C3}) → test::Class
     return throw "unsupported";
   @#C1
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({erroneously-initialized core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
     return new test::Class::_internal(defaultValue: defaultValue);
 }
 
diff --git a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.outline.expect b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.outline.expect
index 14561fc0ca7..72b8df10623 100644
--- a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.outline.expect
@@ -26,7 +26,7 @@ class Class extends core::Object /*hasConstConstructor*/  {
   static factory /* from org-dartlang-testcase:///patch_lib.dart */ constFact({core::bool defaultValue = true}) → self2::Class
     ;
   @_in::patch
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({core::bool defaultValue = true}) → self2::Class /* redirection-target: self2::Class::_internal */
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({core::bool defaultValue = false}) → self2::Class /* redirection-target: self2::Class::_internal */
     return new self2::Class::_internal(defaultValue: defaultValue);
 }
 
diff --git a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.transformed.expect b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.transformed.expect
index 2461e05bd1c..78de2b2ed82 100644
--- a/pkg/front_end/testcases/general/factory_patch/main.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/factory_patch/main.dart.strong.transformed.expect
@@ -36,7 +36,7 @@ class Class extends core::Object /*hasConstConstructor*/  {
   static factory /* from org-dartlang-testcase:///patch_lib.dart */ constFact({core::bool defaultValue = #C3}) → test::Class
     return throw "unsupported";
   @#C1
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect({erroneously-initialized core::bool defaultValue = #C2}) → test::Class /* redirection-target: test::Class::_internal */
     return new test::Class::_internal(defaultValue: defaultValue);
 }
 
diff --git a/pkg/front_end/testcases/general/issue47036.dart.strong.outline.expect b/pkg/front_end/testcases/general/issue47036.dart.strong.outline.expect
index 9f00a8f631a..1bcc8970938 100644
--- a/pkg/front_end/testcases/general/issue47036.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/issue47036.dart.strong.outline.expect
@@ -9,7 +9,7 @@ class Default extends core::Object /*hasConstConstructor*/  {
     ;
 }
 class Settings extends core::Object {
-  static factory •({self::Sidebar sidebar = null}) → self::Settings /* redirection-target: self::_SSettings::• */
+  static factory •({self::Sidebar sidebar = const self::_$_SSidebar::•()}) → self::Settings /* redirection-target: self::_SSettings::• */
     return self::_SSettings::•(sidebar: sidebar);
 }
 class Sidebar extends core::Object {
@@ -17,7 +17,7 @@ class Sidebar extends core::Object {
     return self::_SSidebar::•();
 }
 abstract class _SSettings extends core::Object implements self::Settings {
-  static factory •({self::Sidebar sidebar = null}) → self::_SSettings /* redirection-target: self::_$_SSettings::• */
+  static factory •({self::Sidebar sidebar = const self::_$_SSidebar::•()}) → self::_SSettings /* redirection-target: self::_$_SSettings::• */
     return new self::_$_SSettings::•(sidebar: sidebar);
 }
 class _$_SSettings extends core::Object implements self::_SSettings /*hasConstConstructor*/  {
@@ -40,5 +40,7 @@ static method main() → void
 
 
 Extra constant evaluation status:
+Evaluated: ConstructorInvocation @ org-dartlang-testcase:///issue47036.dart:13:33 -> InstanceConstant(const _$_SSidebar{})
+Evaluated: ConstructorInvocation @ org-dartlang-testcase:///issue47036.dart:22:37 -> InstanceConstant(const _$_SSidebar{})
 Evaluated: ConstructorInvocation @ org-dartlang-testcase:///issue47036.dart:26:44 -> InstanceConstant(const _$_SSidebar{})
-Extra constant evaluation: evaluated: 9, effectively constant: 1
+Extra constant evaluation: evaluated: 11, effectively constant: 3
diff --git a/pkg/front_end/testcases/general/issue48548.dart.strong.outline.expect b/pkg/front_end/testcases/general/issue48548.dart.strong.outline.expect
index 1619ece2661..c2167f6669b 100644
--- a/pkg/front_end/testcases/general/issue48548.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/issue48548.dart.strong.outline.expect
@@ -4,7 +4,7 @@ import "dart:core" as core;
 
 abstract class A extends core::Object {
   abstract get value() → core::int;
-  static factory •({core::int value = null}) → self::A /* redirection-target: self::_AImpl::• */
+  static factory •({core::int value = 0}) → self::A /* redirection-target: self::_AImpl::• */
     return new self::_AImpl::•(value: value);
 }
 class _AImpl extends core::Object implements self::A {
diff --git a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.expect b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.expect
index 71cd9dcdb60..0785adc49f2 100644
--- a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.expect
+++ b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.expect
@@ -24,15 +24,15 @@ class Class extends core::Object {
     ;
   static factory redirect1a() → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional();
-  static factory redirect2a(core::int a = #C1) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect2a(core::int a) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
   static factory redirect3a([core::int a = #C1]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
-  static factory redirect4a(core::int a = #C1, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect4a(core::int a, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect5a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
-  static factory redirect6a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect6a([core::int a = #C1, erroneously-initialized core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect1b() → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named();
@@ -44,7 +44,7 @@ class Class extends core::Object {
     return new self::Class::named(a: a, b: b);
   static factory redirect5b({core::int b = #C2, core::int a = #C1}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(b: b, a: a);
-  static factory redirect6b({core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect6b({erroneously-initialized core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a, b: b);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.modular.expect b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.modular.expect
index 71cd9dcdb60..0785adc49f2 100644
--- a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.modular.expect
@@ -24,15 +24,15 @@ class Class extends core::Object {
     ;
   static factory redirect1a() → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional();
-  static factory redirect2a(core::int a = #C1) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect2a(core::int a) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
   static factory redirect3a([core::int a = #C1]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
-  static factory redirect4a(core::int a = #C1, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect4a(core::int a, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect5a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
-  static factory redirect6a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect6a([core::int a = #C1, erroneously-initialized core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect1b() → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named();
@@ -44,7 +44,7 @@ class Class extends core::Object {
     return new self::Class::named(a: a, b: b);
   static factory redirect5b({core::int b = #C2, core::int a = #C1}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(b: b, a: a);
-  static factory redirect6b({core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect6b({erroneously-initialized core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a, b: b);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.outline.expect b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.outline.expect
index 3641175ab24..9af2073122a 100644
--- a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.outline.expect
@@ -11,25 +11,25 @@ class Class extends core::Object {
     return new self::Class::positional();
   static factory redirect2a(core::int a) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
-  static factory redirect3a([core::int a = null]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect3a([core::int a = 0]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
-  static factory redirect4a(core::int a, [core::int b = null]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect4a(core::int a, [core::int b = 42]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
-  static factory redirect5a([core::int a = null, core::int b = null]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect5a([core::int a = 0, core::int b = 42]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
-  static factory redirect6a([core::int a = null, core::int b = 2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect6a([core::int a = 0, core::int b = 42]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect1b() → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named();
-  static factory redirect2b({core::int a = null}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect2b({core::int a = 0}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a);
-  static factory redirect3b({core::int b = null}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect3b({core::int b = 42}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(b: b);
-  static factory redirect4b({core::int a = null, core::int b = null}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect4b({core::int a = 0, core::int b = 42}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a, b: b);
-  static factory redirect5b({core::int b = null, core::int a = null}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect5b({core::int b = 42, core::int a = 0}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(b: b, a: a);
-  static factory redirect6b({core::int a = 1, core::int b = null}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect6b({core::int a = 0, core::int b = 42}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a, b: b);
 }
 static method main() → dynamic
diff --git a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.transformed.expect b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.transformed.expect
index 71cd9dcdb60..0785adc49f2 100644
--- a/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/redirecting_default_values.dart.strong.transformed.expect
@@ -24,15 +24,15 @@ class Class extends core::Object {
     ;
   static factory redirect1a() → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional();
-  static factory redirect2a(core::int a = #C1) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect2a(core::int a) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
   static factory redirect3a([core::int a = #C1]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a);
-  static factory redirect4a(core::int a = #C1, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect4a(core::int a, [core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect5a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
-  static factory redirect6a([core::int a = #C1, core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
+  static factory redirect6a([core::int a = #C1, erroneously-initialized core::int b = #C2]) → self::Class /* redirection-target: self::Class::positional */
     return new self::Class::positional(a, b);
   static factory redirect1b() → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named();
@@ -44,7 +44,7 @@ class Class extends core::Object {
     return new self::Class::named(a: a, b: b);
   static factory redirect5b({core::int b = #C2, core::int a = #C1}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(b: b, a: a);
-  static factory redirect6b({core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
+  static factory redirect6b({erroneously-initialized core::int a = #C1, core::int b = #C2}) → self::Class /* redirection-target: self::Class::named */
     return new self::Class::named(a: a, b: b);
 }
 static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.expect b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.expect
index 1929ef6c387..a74cee0c555 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.expect
@@ -15,7 +15,7 @@ class A extends core::Object {
   constructor •([core::int field = #C1]) → self::A
     : self::A::field = field, super core::Object::•()
     ;
-  static factory redirect([core::int field = #C1]) → self::A /* redirection-target: self::A::• */
+  static factory redirect([erroneously-initialized core::int field = #C1]) → self::A /* redirection-target: self::A::• */
     return new self::A::•(field);
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.modular.expect b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.modular.expect
index 1929ef6c387..a74cee0c555 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.modular.expect
@@ -15,7 +15,7 @@ class A extends core::Object {
   constructor •([core::int field = #C1]) → self::A
     : self::A::field = field, super core::Object::•()
     ;
-  static factory redirect([core::int field = #C1]) → self::A /* redirection-target: self::A::• */
+  static factory redirect([erroneously-initialized core::int field = #C1]) → self::A /* redirection-target: self::A::• */
     return new self::A::•(field);
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.outline.expect b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.outline.expect
index e57dbb8b4d8..78e25419ff5 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.outline.expect
@@ -6,7 +6,7 @@ class A extends core::Object {
   final field core::int field;
   constructor •([core::int field = 42]) → self::A
     ;
-  static factory redirect([core::int field = 87]) → self::A /* redirection-target: self::A::• */
+  static factory redirect([core::int field = 42]) → self::A /* redirection-target: self::A::• */
     return new self::A::•(field);
 }
 static method main() → dynamic
diff --git a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.transformed.expect b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.transformed.expect
index 1929ef6c387..a74cee0c555 100644
--- a/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/general/redirecting_factory_default_value.dart.strong.transformed.expect
@@ -15,7 +15,7 @@ class A extends core::Object {
   constructor •([core::int field = #C1]) → self::A
     : self::A::field = field, super core::Object::•()
     ;
-  static factory redirect([core::int field = #C1]) → self::A /* redirection-target: self::A::• */
+  static factory redirect([erroneously-initialized core::int field = #C1]) → self::A /* redirection-target: self::A::• */
     return new self::A::•(field);
 }
 static method main() → dynamic {
diff --git a/pkg/front_end/testcases/general/tear_off_patch/main.dart.strong.outline.expect b/pkg/front_end/testcases/general/tear_off_patch/main.dart.strong.outline.expect
index fb602b09c82..545ce430127 100644
--- a/pkg/front_end/testcases/general/tear_off_patch/main.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/general/tear_off_patch/main.dart.strong.outline.expect
@@ -24,10 +24,10 @@ class Class<T extends core::Object? = dynamic> extends core::Object {
   static factory /* from org-dartlang-testcase:///patch_lib.dart */ fact<T extends core::Object? = dynamic>({core::bool defaultValue = true, required self2::Class::fact::T% value}) → self2::Class<self2::Class::fact::T%>
     ;
   @_in::patch
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect<T extends core::Object? = dynamic>({core::bool defaultValue = null, required self2::Class::redirect::T% value}) → self2::Class<self2::Class::redirect::T%> /* redirection-target: self2::ClassImpl::•<self2::Class::redirect::T%>*/
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect<T extends core::Object? = dynamic>({core::bool defaultValue = true, required self2::Class::redirect::T% value}) → self2::Class<self2::Class::redirect::T%> /* redirection-target: self2::ClassImpl::•<self2::Class::redirect::T%>*/
     return new self2::ClassImpl::•<self2::Class::redirect::T%>(defaultValue: defaultValue, value: value);
   @_in::patch
-  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect2<T extends core::Object? = dynamic>({core::bool defaultValue = null, required self2::Class::redirect2::T% value}) → self2::Class<self2::Class::redirect2::T%> /* redirection-target: self2::ClassImpl::patched<self2::Class::redirect2::T%>*/
+  static factory /* from org-dartlang-testcase:///patch_lib.dart */ redirect2<T extends core::Object? = dynamic>({core::bool defaultValue = true, required self2::Class::redirect2::T% value}) → self2::Class<self2::Class::redirect2::T%> /* redirection-target: self2::ClassImpl::patched<self2::Class::redirect2::T%>*/
     return new self2::ClassImpl::patched<self2::Class::redirect2::T%>(defaultValue: defaultValue, value: value);
 }
 @/* from org-dartlang-testcase:///patch_lib.dart */ _in::patch
diff --git a/pkg/front_end/testcases/inference/flutter_issue160551.dart.strong.outline.expect b/pkg/front_end/testcases/inference/flutter_issue160551.dart.strong.outline.expect
index 12e985c0c96..e99e9cf8a4b 100644
--- a/pkg/front_end/testcases/inference/flutter_issue160551.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/inference/flutter_issue160551.dart.strong.outline.expect
@@ -5,7 +5,7 @@ import "dart:core" as core;
 abstract class A extends core::Object {
   constructor •() → self::A
     ;
-  static factory redir({core::double foo = null}) → self::A /* redirection-target: self::B::•<dynamic>*/
+  static factory redir({core::double foo = 10.0}) → self::A /* redirection-target: self::B::•<dynamic>*/
     return new self::B::•<dynamic>(foo: foo);
 }
 class B<T extends core::Object? = dynamic> extends self::A {
diff --git a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.expect
index 2cd432cd320..70ab8ebe8cb 100644
--- a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.expect
@@ -130,9 +130,9 @@ class A extends core::Object {
     ;
   external constructor constructor8([core::int i = #C1]) → self::A;
   external constructor constructor9({core::int i = #C1}) → self::A;
-  static factory factory3([core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
     return new self::A::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
     return new self::A::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::A /* redirection-target: self::A::constructor5 */
     return new self::A::constructor5(i);
@@ -190,9 +190,9 @@ class C extends core::Object implements self::B {
   constructor constructor7({required core::int i}) → self::C
     : self::C::i = i, super core::Object::•()
     ;
-  static factory factory3([core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
     return new self::C::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
     return new self::C::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::C /* redirection-target: self::C::constructor5 */
     return new self::C::constructor5(i);
diff --git a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.modular.expect b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.modular.expect
index 2cd432cd320..70ab8ebe8cb 100644
--- a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.modular.expect
@@ -130,9 +130,9 @@ class A extends core::Object {
     ;
   external constructor constructor8([core::int i = #C1]) → self::A;
   external constructor constructor9({core::int i = #C1}) → self::A;
-  static factory factory3([core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
     return new self::A::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
     return new self::A::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::A /* redirection-target: self::A::constructor5 */
     return new self::A::constructor5(i);
@@ -190,9 +190,9 @@ class C extends core::Object implements self::B {
   constructor constructor7({required core::int i}) → self::C
     : self::C::i = i, super core::Object::•()
     ;
-  static factory factory3([core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
     return new self::C::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
     return new self::C::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::C /* redirection-target: self::C::constructor5 */
     return new self::C::constructor5(i);
diff --git a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.outline.expect b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.outline.expect
index bcec2d41824..cb570cb7884 100644
--- a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.outline.expect
@@ -103,9 +103,9 @@ class A extends core::Object {
     ;
   external constructor constructor8([core::int i = null]) → self::A;
   external constructor constructor9({core::int i = null}) → self::A;
-  static factory factory3([core::int i = null]) → self::A /* redirection-target: self::A::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = null]) → self::A /* redirection-target: self::A::constructor3 */
     return new self::A::constructor3(i);
-  static factory factory4({core::int i = null}) → self::A /* redirection-target: self::A::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = null}) → self::A /* redirection-target: self::A::constructor4 */
     return new self::A::constructor4(i: i);
   static factory factory5([core::int? i = null]) → self::A /* redirection-target: self::A::constructor5 */
     return new self::A::constructor5(i);
@@ -156,9 +156,9 @@ class C extends core::Object implements self::B {
     ;
   constructor constructor7({required core::int i}) → self::C
     ;
-  static factory factory3([core::int i = null]) → self::C /* redirection-target: self::C::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = null]) → self::C /* redirection-target: self::C::constructor3 */
     return new self::C::constructor3(i);
-  static factory factory4({core::int i = null}) → self::C /* redirection-target: self::C::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = null}) → self::C /* redirection-target: self::C::constructor4 */
     return new self::C::constructor4(i: i);
   static factory factory5([core::int? i = null]) → self::C /* redirection-target: self::C::constructor5 */
     return new self::C::constructor5(i);
diff --git a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.transformed.expect
index 73ce2cefea3..9ae0ce7c0af 100644
--- a/pkg/front_end/testcases/nnbd/issue42362.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue42362.dart.strong.transformed.expect
@@ -130,9 +130,9 @@ class A extends core::Object {
     ;
   external constructor constructor8([core::int i = #C1]) → self::A;
   external constructor constructor9({core::int i = #C1}) → self::A;
-  static factory factory3([core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::A /* redirection-target: self::A::constructor3 */
     return new self::A::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::A /* redirection-target: self::A::constructor4 */
     return new self::A::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::A /* redirection-target: self::A::constructor5 */
     return new self::A::constructor5(i);
@@ -190,9 +190,9 @@ class C extends core::Object implements self::B {
   constructor constructor7({required core::int i}) → self::C
     : self::C::i = i, super core::Object::•()
     ;
-  static factory factory3([core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
+  static factory factory3([erroneously-initialized core::int i = #C1]) → self::C /* redirection-target: self::C::constructor3 */
     return new self::C::constructor3(i);
-  static factory factory4({core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
+  static factory factory4({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::constructor4 */
     return new self::C::constructor4(i: i);
   static factory factory5([core::int? i = #C1]) → self::C /* redirection-target: self::C::constructor5 */
     return new self::C::constructor5(i);
diff --git a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.expect b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.expect
index 207c98cad0f..f55322a2834 100644
--- a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.expect
+++ b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.expect
@@ -22,7 +22,7 @@ class C extends core::Object {
   static factory fact({erroneously-initialized core::int i = #C1}) → self::C {
     return new self::C::gen();
   }
-  static factory redirect({core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
+  static factory redirect({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
     return new self::C::gen(i: i);
 }
 class D extends core::Object {
diff --git a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.modular.expect b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.modular.expect
index 207c98cad0f..f55322a2834 100644
--- a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.modular.expect
+++ b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.modular.expect
@@ -22,7 +22,7 @@ class C extends core::Object {
   static factory fact({erroneously-initialized core::int i = #C1}) → self::C {
     return new self::C::gen();
   }
-  static factory redirect({core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
+  static factory redirect({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
     return new self::C::gen(i: i);
 }
 class D extends core::Object {
diff --git a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.outline.expect b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.outline.expect
index a190091f028..3ecf21ffefb 100644
--- a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.outline.expect
+++ b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.outline.expect
@@ -20,7 +20,7 @@ class C extends core::Object {
     ;
   static factory fact({erroneously-initialized core::int i = null}) → self::C
     ;
-  static factory redirect({core::int i = null}) → self::C /* redirection-target: self::C::gen */
+  static factory redirect({erroneously-initialized core::int i = null}) → self::C /* redirection-target: self::C::gen */
     return new self::C::gen(i: i);
 }
 class D extends core::Object {
diff --git a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.transformed.expect b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.transformed.expect
index 207c98cad0f..f55322a2834 100644
--- a/pkg/front_end/testcases/nnbd/issue43276.dart.strong.transformed.expect
+++ b/pkg/front_end/testcases/nnbd/issue43276.dart.strong.transformed.expect
@@ -22,7 +22,7 @@ class C extends core::Object {
   static factory fact({erroneously-initialized core::int i = #C1}) → self::C {
     return new self::C::gen();
   }
-  static factory redirect({core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
+  static factory redirect({erroneously-initialized core::int i = #C1}) → self::C /* redirection-target: self::C::gen */
     return new self::C::gen(i: i);
 }
 class D extends core::Object {