[cfe] Report error on nullable supertypes through type aliases
Closes #43261
Closes #45423
Change-Id: Ia22975f9cd8fd3835b0feda82c6d5310098b605c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/193501
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
diff --git a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
index 1833d4f..31a334d 100644
--- a/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/named_type_builder.dart
@@ -21,6 +21,8 @@
templateExtendingRestricted,
templateNotAType,
templateSupertypeIsIllegal,
+ templateSupertypeIsIllegalAliased,
+ templateSupertypeIsNullableAliased,
templateSupertypeIsTypeVariable,
templateTypeArgumentMismatch,
templateTypeArgumentsOnTypeVariable,
@@ -177,7 +179,7 @@
String get debugName => "NamedTypeBuilder";
StringBuffer printOn(StringBuffer buffer) {
- buffer.write(name);
+ buffer.write(flattenName(name, charOffset, fileUri));
if (arguments?.isEmpty ?? true) return buffer;
buffer.write("<");
bool first = true;
@@ -201,29 +203,39 @@
context: context);
}
- Supertype handleInvalidSupertype(LibraryBuilder library, int charOffset,
- Uri fileUri, TypeAliasBuilder aliasBuilder) {
+ Supertype handleInvalidSupertype(
+ LibraryBuilder library, int charOffset, Uri fileUri) {
Template<Message Function(String name)> template =
declaration.isTypeVariable
? templateSupertypeIsTypeVariable
: templateSupertypeIsIllegal;
- if (aliasBuilder != null) {
- library.addProblem(
- template.withArguments(flattenName(name, charOffset, fileUri)),
- charOffset,
- noLength,
- fileUri,
- context: [
- messageTypedefCause.withLocation(
- aliasBuilder.fileUri, aliasBuilder.charOffset, noLength),
- ]);
- } else {
- library.addProblem(
- template.withArguments(flattenName(name, charOffset, fileUri)),
- charOffset,
- noLength,
- fileUri);
- }
+ library.addProblem(template.withArguments(fullNameForErrors), charOffset,
+ noLength, fileUri);
+ return null;
+ }
+
+ Supertype handleInvalidAliasedSupertype(
+ LibraryBuilder library,
+ int charOffset,
+ Uri fileUri,
+ TypeAliasBuilder aliasBuilder,
+ DartType type) {
+ Template<Message Function(String name, DartType type, bool)> template =
+ declaration.isTypeVariable
+ ? templateSupertypeIsTypeVariable
+ : (type != null && type.nullability == Nullability.nullable
+ ? templateSupertypeIsNullableAliased
+ : templateSupertypeIsIllegalAliased);
+ library.addProblem(
+ template.withArguments(
+ fullNameForErrors, type, library.isNonNullableByDefault),
+ charOffset,
+ noLength,
+ fileUri,
+ context: [
+ messageTypedefCause.withLocation(
+ aliasBuilder.fileUri, aliasBuilder.charOffset, noLength),
+ ]);
return null;
}
@@ -266,7 +278,6 @@
Supertype buildSupertype(
LibraryBuilder library, int charOffset, Uri fileUri) {
TypeDeclarationBuilder declaration = this.declaration;
- TypeAliasBuilder aliasBuilder; // Non-null if a type alias is used.
if (declaration is ClassBuilder) {
if (declaration.isNullClass && !library.mayImplementRestrictedTypes) {
library.addProblem(
@@ -277,10 +288,10 @@
}
return declaration.buildSupertype(library, arguments);
} else if (declaration is TypeAliasBuilder) {
- aliasBuilder = declaration;
+ TypeAliasBuilder aliasBuilder = declaration;
DartType type =
declaration.buildType(library, library.nonNullableBuilder, arguments);
- if (type is InterfaceType) {
+ if (type is InterfaceType && type.nullability != Nullability.nullable) {
return new Supertype(type.classNode, type.typeArguments);
} else if (type is NullType) {
// Even though Null is disallowed as a supertype, ClassHierarchyBuilder
@@ -324,9 +335,9 @@
unaliasedDeclaration.name == "FutureOr");
return new Supertype((unaliasedDeclaration as ClassBuilder).cls,
<DartType>[type.typeArgument]);
- } else {
- // Do nothing: handleInvalidSuper below will handle the erroneous case.
}
+ return handleInvalidAliasedSupertype(
+ library, charOffset, fileUri, aliasBuilder, type);
} else if (declaration is InvalidTypeDeclarationBuilder) {
library.addProblem(
declaration.message.messageObject,
@@ -336,22 +347,23 @@
severity: Severity.error);
return null;
}
- return handleInvalidSupertype(library, charOffset, fileUri, aliasBuilder);
+ return handleInvalidSupertype(library, charOffset, fileUri);
}
Supertype buildMixedInType(
LibraryBuilder library, int charOffset, Uri fileUri) {
TypeDeclarationBuilder declaration = this.declaration;
- TypeAliasBuilder aliasBuilder; // Non-null if a type alias is used.
if (declaration is ClassBuilder) {
return declaration.buildMixedInType(library, arguments);
} else if (declaration is TypeAliasBuilder) {
- aliasBuilder = declaration;
+ TypeAliasBuilder aliasBuilder = declaration;
DartType type =
declaration.buildType(library, library.nonNullableBuilder, arguments);
- if (type is InterfaceType) {
+ if (type is InterfaceType && type.nullability != Nullability.nullable) {
return new Supertype(type.classNode, type.typeArguments);
}
+ return handleInvalidAliasedSupertype(
+ library, charOffset, fileUri, aliasBuilder, type);
} else if (declaration is InvalidTypeDeclarationBuilder) {
library.addProblem(
declaration.message.messageObject,
@@ -361,7 +373,7 @@
severity: Severity.error);
return null;
}
- return handleInvalidSupertype(library, charOffset, fileUri, aliasBuilder);
+ return handleInvalidSupertype(library, charOffset, fileUri);
}
TypeBuilder subst(Map<TypeVariableBuilder, TypeBuilder> substitution) {
diff --git a/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart b/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart
index 21f427c..4e0e710 100644
--- a/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart
+++ b/pkg/front_end/lib/src/fasta/fasta_codes_cfe_generated.dart
@@ -4631,6 +4631,78 @@
// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
const Template<
Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>
+ templateSupertypeIsIllegalAliased = const Template<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>(
+ messageTemplate:
+ r"""The type '#name' which is an alias of '#type' can't be used as supertype.""",
+ withArguments: _withArgumentsSupertypeIsIllegalAliased);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>
+ codeSupertypeIsIllegalAliased = const Code<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>(
+ "SupertypeIsIllegalAliased",
+ analyzerCodes: <String>["EXTENDS_NON_CLASS"]);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsSupertypeIsIllegalAliased(
+ String name, DartType _type, bool isNonNullableByDefault) {
+ if (name.isEmpty) throw 'No name provided';
+ name = demangleMixinApplicationName(name);
+ TypeLabeler labeler = new TypeLabeler(isNonNullableByDefault);
+ List<Object> typeParts = labeler.labelType(_type);
+ String type = typeParts.join();
+ return new Message(codeSupertypeIsIllegalAliased,
+ message:
+ """The type '${name}' which is an alias of '${type}' can't be used as supertype.""" +
+ labeler.originMessages,
+ arguments: {'name': name, 'type': _type});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>
+ templateSupertypeIsNullableAliased = const Template<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>(
+ messageTemplate:
+ r"""The type '#name' which is an alias of '#type' can't be used as supertype because it is nullable.""",
+ withArguments: _withArgumentsSupertypeIsNullableAliased);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Code<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>
+ codeSupertypeIsNullableAliased = const Code<
+ Message Function(
+ String name, DartType _type, bool isNonNullableByDefault)>(
+ "SupertypeIsNullableAliased",
+ analyzerCodes: <String>["EXTENDS_NON_CLASS"]);
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+Message _withArgumentsSupertypeIsNullableAliased(
+ String name, DartType _type, bool isNonNullableByDefault) {
+ if (name.isEmpty) throw 'No name provided';
+ name = demangleMixinApplicationName(name);
+ TypeLabeler labeler = new TypeLabeler(isNonNullableByDefault);
+ List<Object> typeParts = labeler.labelType(_type);
+ String type = typeParts.join();
+ return new Message(codeSupertypeIsNullableAliased,
+ message:
+ """The type '${name}' which is an alias of '${type}' can't be used as supertype because it is nullable.""" +
+ labeler.originMessages,
+ arguments: {'name': name, 'type': _type});
+}
+
+// DO NOT EDIT. THIS FILE IS GENERATED. SEE TOP OF FILE.
+const Template<
+ Message Function(
DartType _type, DartType _type2, bool isNonNullableByDefault)>
templateSwitchExpressionNotAssignable = const Template<
Message Function(
diff --git a/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart b/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart
index f7d816c..e097eca 100644
--- a/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/type_labeler.dart
@@ -112,8 +112,8 @@
result.add(nameForEntity(
typedefNode,
typedefNode.name,
- typedefNode.enclosingLibrary.importUri,
- typedefNode.enclosingLibrary.fileUri));
+ typedefNode?.enclosingLibrary?.importUri ?? unknownUri,
+ typedefNode?.enclosingLibrary?.fileUri ?? unknownUri));
if (node.typeArguments.isNotEmpty) {
result.add("<");
bool first = true;
@@ -226,8 +226,10 @@
result.add(nameForEntity(
classNode,
classNode.name,
- classNode.enclosingLibrary.importUri,
- classNode.enclosingLibrary.fileUri));
+ // TODO(johnniwinther): Ensure enclosing libraries on classes earlier
+ // in the compiler to ensure types in error messages have context.
+ classNode?.enclosingLibrary?.importUri ?? unknownUri,
+ classNode?.enclosingLibrary?.fileUri ?? unknownUri));
if (node.typeArguments.isNotEmpty) {
result.add("<");
bool first = true;
@@ -252,8 +254,8 @@
result.add(nameForEntity(
node.extension,
node.extension.name,
- node.extension.enclosingLibrary.importUri,
- node.extension.enclosingLibrary.fileUri));
+ node.extension?.enclosingLibrary?.importUri ?? unknownUri,
+ node.extension?.enclosingLibrary?.fileUri ?? unknownUri));
if (node.typeArguments.isNotEmpty) {
result.add("<");
bool first = true;
diff --git a/pkg/front_end/messages.status b/pkg/front_end/messages.status
index d25dfc3..cebc0ac 100644
--- a/pkg/front_end/messages.status
+++ b/pkg/front_end/messages.status
@@ -745,6 +745,8 @@
SupertypeIsFunction/analyzerCode: Fail
SupertypeIsFunction/example: Fail
SupertypeIsIllegal/example: Fail
+SupertypeIsIllegalAliased/example: Fail
+SupertypeIsNullableAliased/example: Fail
SupertypeIsTypeVariable/example: Fail
SwitchCaseFallThrough/example: Fail
SwitchExpressionNotSubtype/analyzerCode: Fail
diff --git a/pkg/front_end/messages.yaml b/pkg/front_end/messages.yaml
index c5be3f5..9525c92 100644
--- a/pkg/front_end/messages.yaml
+++ b/pkg/front_end/messages.yaml
@@ -2952,6 +2952,14 @@
template: "The type '#name' can't be used as supertype."
analyzerCode: EXTENDS_NON_CLASS
+SupertypeIsIllegalAliased:
+ template: "The type '#name' which is an alias of '#type' can't be used as supertype."
+ analyzerCode: EXTENDS_NON_CLASS
+
+SupertypeIsNullableAliased:
+ template: "The type '#name' which is an alias of '#type' can't be used as supertype because it is nullable."
+ analyzerCode: EXTENDS_NON_CLASS
+
SupertypeIsTypeVariable:
template: "The type variable '#name' can't be used as supertype."
analyzerCode: EXTENDS_NON_CLASS
diff --git a/pkg/front_end/test/spell_checking_list_tests.txt b/pkg/front_end/test/spell_checking_list_tests.txt
index 8050222..17ee5f0 100644
--- a/pkg/front_end/test/spell_checking_list_tests.txt
+++ b/pkg/front_end/test/spell_checking_list_tests.txt
@@ -180,6 +180,8 @@
cursor
cuts
cx
+d1a
+d1b
dacoharkes
dadd
daemon
@@ -523,6 +525,8 @@
mx
mxn
mysdk
+n1a
+n1b
naively
naturally
negatable
diff --git a/pkg/front_end/testcases/general/qualified.dart.weak.expect b/pkg/front_end/testcases/general/qualified.dart.weak.expect
index a51969d..b829051 100644
--- a/pkg/front_end/testcases/general/qualified.dart.weak.expect
+++ b/pkg/front_end/testcases/general/qualified.dart.weak.expect
@@ -17,7 +17,7 @@
// lib.Missing method() {}
// ^^^^^^^^^^^
//
-// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' can't be used as supertype.
+// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' which is an alias of 'void Function()' can't be used as supertype.
// class IllegalSupertype extends lib.VoidFunction {}
// ^
// pkg/front_end/testcases/general/qualified_lib.dart:27:9: Context: The issue arises via this type alias.
diff --git a/pkg/front_end/testcases/general/qualified.dart.weak.outline.expect b/pkg/front_end/testcases/general/qualified.dart.weak.outline.expect
index fcf8ecc..2102d04 100644
--- a/pkg/front_end/testcases/general/qualified.dart.weak.outline.expect
+++ b/pkg/front_end/testcases/general/qualified.dart.weak.outline.expect
@@ -17,7 +17,7 @@
// lib.Missing method() {}
// ^^^^^^^^^^^
//
-// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' can't be used as supertype.
+// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' which is an alias of 'void Function()' can't be used as supertype.
// class IllegalSupertype extends lib.VoidFunction {}
// ^
// pkg/front_end/testcases/general/qualified_lib.dart:27:9: Context: The issue arises via this type alias.
diff --git a/pkg/front_end/testcases/general/qualified.dart.weak.transformed.expect b/pkg/front_end/testcases/general/qualified.dart.weak.transformed.expect
index 25de173..003ca00 100644
--- a/pkg/front_end/testcases/general/qualified.dart.weak.transformed.expect
+++ b/pkg/front_end/testcases/general/qualified.dart.weak.transformed.expect
@@ -17,7 +17,7 @@
// lib.Missing method() {}
// ^^^^^^^^^^^
//
-// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' can't be used as supertype.
+// pkg/front_end/testcases/general/qualified.dart:18:7: Error: The type 'lib.VoidFunction' which is an alias of 'void Function()' can't be used as supertype.
// class IllegalSupertype extends lib.VoidFunction {}
// ^
// pkg/front_end/testcases/general/qualified_lib.dart:27:9: Context: The issue arises via this type alias.
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart
new file mode 100644
index 0000000..30966c9
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart
@@ -0,0 +1,57 @@
+// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'nullable_supertypes.dart' as prefix;
+
+class A {}
+class B {}
+class C {}
+
+typedef AAlias = A?;
+typedef BAlias = B?;
+typedef CAlias = C?;
+typedef TAlias<T> = T?;
+
+class C1 extends AAlias {}
+
+class C2 implements AAlias {}
+
+class C3 = A with BAlias;
+
+class C4 = A with B implements CAlias;
+
+class C5 extends A with BAlias {}
+
+mixin M1 on AAlias {}
+
+mixin M2 on A, BAlias {}
+
+mixin M3 on A implements BAlias {}
+
+class D1 extends TAlias<A> {}
+
+class D1a extends prefix.TAlias<A> {}
+
+class D1b extends TAlias<prefix.A> {}
+
+class D2 implements TAlias<A> {}
+
+class D3 = A with TAlias<B>;
+
+class D4 = A with B implements TAlias<C>;
+
+class D5 extends A with TAlias<B> {}
+
+mixin N1 on TAlias<A> {}
+
+mixin N1a on prefix.TAlias<A> {}
+
+mixin N1b on TAlias<prefix.A> {}
+
+mixin N2 on A, TAlias<B> {}
+
+mixin N3 on A implements TAlias<B> {}
+
+main() {
+}
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.expect
new file mode 100644
index 0000000..1a2fe24
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.expect
@@ -0,0 +1,383 @@
+library /*isNonNullableByDefault*/;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:18: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:21: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias' can't be mixed in.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:32: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:25: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias' can't be mixed in.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:13: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:16: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:26: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:16:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C1 extends AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:18:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C2 implements AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:20:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C3 = A with BAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:22:7: Error: The type 'CAlias' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C4 = A with B implements CAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:13:9: Context: The issue arises via this type alias.
+// typedef CAlias = C?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:24:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C5 extends A with BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:26:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M1 on AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:28:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M2 on A, BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:30:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M3 on A implements BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:7: Error: The type 'TAlias<C>' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///nullable_supertypes.dart" as prefix;
+
+typedef AAlias = self::A?;
+typedef BAlias = self::B?;
+typedef CAlias = self::C?;
+typedef TAlias<T extends core::Object? = dynamic> = T?;
+class A extends core::Object {
+ synthetic constructor •() → self::A
+ : super core::Object::•()
+ ;
+}
+class B extends core::Object {
+ synthetic constructor •() → self::B
+ : super core::Object::•()
+ ;
+}
+class C extends core::Object {
+ synthetic constructor •() → self::C
+ : super core::Object::•()
+ ;
+}
+class C1 extends core::Object {
+ synthetic constructor •() → self::C1
+ : super core::Object::•()
+ ;
+}
+class C2 extends core::Object {
+ synthetic constructor •() → self::C2
+ : super core::Object::•()
+ ;
+}
+class C3 extends self::A {
+ synthetic constructor •() → self::C3
+ : super self::A::•()
+ ;
+}
+class C4 = self::A with self::B {
+ synthetic constructor •() → self::C4
+ : super self::A::•()
+ ;
+}
+abstract class _C5&A&BAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_C5&A&BAlias
+ : super self::A::•()
+ ;
+}
+class C5 extends self::_C5&A&BAlias {
+ synthetic constructor •() → self::C5
+ : super self::_C5&A&BAlias::•()
+ ;
+}
+abstract class M1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _M2&A&BAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_M2&A&BAlias
+ : super core::Object::•()
+ ;
+}
+abstract class M2 extends self::_M2&A&BAlias /*isMixinDeclaration*/ {
+}
+abstract class M3 extends self::A /*isMixinDeclaration*/ {
+}
+class D1 extends core::Object {
+ synthetic constructor •() → self::D1
+ : super core::Object::•()
+ ;
+}
+class D1a extends core::Object {
+ synthetic constructor •() → self::D1a
+ : super core::Object::•()
+ ;
+}
+class D1b extends core::Object {
+ synthetic constructor •() → self::D1b
+ : super core::Object::•()
+ ;
+}
+class D2 extends core::Object {
+ synthetic constructor •() → self::D2
+ : super core::Object::•()
+ ;
+}
+class D3 extends self::A {
+ synthetic constructor •() → self::D3
+ : super self::A::•()
+ ;
+}
+class D4 = self::A with self::B {
+ synthetic constructor •() → self::D4
+ : super self::A::•()
+ ;
+}
+abstract class _D5&A&TAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_D5&A&TAlias
+ : super self::A::•()
+ ;
+}
+class D5 extends self::_D5&A&TAlias {
+ synthetic constructor •() → self::D5
+ : super self::_D5&A&TAlias::•()
+ ;
+}
+abstract class N1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1a extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1b extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _N2&A&TAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_N2&A&TAlias
+ : super core::Object::•()
+ ;
+}
+abstract class N2 extends self::_N2&A&TAlias /*isMixinDeclaration*/ {
+}
+abstract class N3 extends self::A /*isMixinDeclaration*/ {
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.transformed.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.transformed.expect
new file mode 100644
index 0000000..5dac514
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.strong.transformed.expect
@@ -0,0 +1,383 @@
+library /*isNonNullableByDefault*/;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:18: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:21: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias' can't be mixed in.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:32: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:25: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias' can't be mixed in.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:13: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:16: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:26: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:16:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C1 extends AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:18:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C2 implements AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:20:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C3 = A with BAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:22:7: Error: The type 'CAlias' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C4 = A with B implements CAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:13:9: Context: The issue arises via this type alias.
+// typedef CAlias = C?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:24:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C5 extends A with BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:26:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M1 on AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:28:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M2 on A, BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:30:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M3 on A implements BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:7: Error: The type 'TAlias<C>' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///nullable_supertypes.dart" as prefix;
+
+typedef AAlias = self::A?;
+typedef BAlias = self::B?;
+typedef CAlias = self::C?;
+typedef TAlias<T extends core::Object? = dynamic> = T?;
+class A extends core::Object {
+ synthetic constructor •() → self::A
+ : super core::Object::•()
+ ;
+}
+class B extends core::Object {
+ synthetic constructor •() → self::B
+ : super core::Object::•()
+ ;
+}
+class C extends core::Object {
+ synthetic constructor •() → self::C
+ : super core::Object::•()
+ ;
+}
+class C1 extends core::Object {
+ synthetic constructor •() → self::C1
+ : super core::Object::•()
+ ;
+}
+class C2 extends core::Object {
+ synthetic constructor •() → self::C2
+ : super core::Object::•()
+ ;
+}
+class C3 extends self::A {
+ synthetic constructor •() → self::C3
+ : super self::A::•()
+ ;
+}
+class C4 extends self::A implements self::B /*isEliminatedMixin*/ {
+ synthetic constructor •() → self::C4
+ : super self::A::•()
+ ;
+}
+abstract class _C5&A&BAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_C5&A&BAlias
+ : super self::A::•()
+ ;
+}
+class C5 extends self::_C5&A&BAlias {
+ synthetic constructor •() → self::C5
+ : super self::_C5&A&BAlias::•()
+ ;
+}
+abstract class M1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _M2&A&BAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_M2&A&BAlias
+ : super core::Object::•()
+ ;
+}
+abstract class M2 extends self::_M2&A&BAlias /*isMixinDeclaration*/ {
+}
+abstract class M3 extends self::A /*isMixinDeclaration*/ {
+}
+class D1 extends core::Object {
+ synthetic constructor •() → self::D1
+ : super core::Object::•()
+ ;
+}
+class D1a extends core::Object {
+ synthetic constructor •() → self::D1a
+ : super core::Object::•()
+ ;
+}
+class D1b extends core::Object {
+ synthetic constructor •() → self::D1b
+ : super core::Object::•()
+ ;
+}
+class D2 extends core::Object {
+ synthetic constructor •() → self::D2
+ : super core::Object::•()
+ ;
+}
+class D3 extends self::A {
+ synthetic constructor •() → self::D3
+ : super self::A::•()
+ ;
+}
+class D4 extends self::A implements self::B /*isEliminatedMixin*/ {
+ synthetic constructor •() → self::D4
+ : super self::A::•()
+ ;
+}
+abstract class _D5&A&TAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_D5&A&TAlias
+ : super self::A::•()
+ ;
+}
+class D5 extends self::_D5&A&TAlias {
+ synthetic constructor •() → self::D5
+ : super self::_D5&A&TAlias::•()
+ ;
+}
+abstract class N1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1a extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1b extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _N2&A&TAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_N2&A&TAlias
+ : super core::Object::•()
+ ;
+}
+abstract class N2 extends self::_N2&A&TAlias /*isMixinDeclaration*/ {
+}
+abstract class N3 extends self::A /*isMixinDeclaration*/ {
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.textual_outline.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.textual_outline.expect
new file mode 100644
index 0000000..fbfa19f
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.textual_outline.expect
@@ -0,0 +1,29 @@
+import 'nullable_supertypes.dart' as prefix;
+class A {}
+class B {}
+class C {}
+typedef AAlias = A?;
+typedef BAlias = B?;
+typedef CAlias = C?;
+typedef TAlias<T> = T?;
+class C1 extends AAlias {}
+class C2 implements AAlias {}
+class C3 = A with BAlias;
+class C4 = A with B implements CAlias;
+class C5 extends A with BAlias {}
+mixin M1 on AAlias {}
+mixin M2 on A, BAlias {}
+mixin M3 on A implements BAlias {}
+class D1 extends TAlias<A> {}
+class D1a extends prefix.TAlias<A> {}
+class D1b extends TAlias<prefix.A> {}
+class D2 implements TAlias<A> {}
+class D3 = A with TAlias<B>;
+class D4 = A with B implements TAlias<C>;
+class D5 extends A with TAlias<B> {}
+mixin N1 on TAlias<A> {}
+mixin N1a on prefix.TAlias<A> {}
+mixin N1b on TAlias<prefix.A> {}
+mixin N2 on A, TAlias<B> {}
+mixin N3 on A implements TAlias<B> {}
+main() {}
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.expect
new file mode 100644
index 0000000..1a2fe24
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.expect
@@ -0,0 +1,383 @@
+library /*isNonNullableByDefault*/;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:18: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:21: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias' can't be mixed in.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:32: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:25: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias' can't be mixed in.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:13: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:16: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:26: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:16:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C1 extends AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:18:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C2 implements AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:20:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C3 = A with BAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:22:7: Error: The type 'CAlias' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C4 = A with B implements CAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:13:9: Context: The issue arises via this type alias.
+// typedef CAlias = C?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:24:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C5 extends A with BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:26:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M1 on AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:28:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M2 on A, BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:30:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M3 on A implements BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:7: Error: The type 'TAlias<C>' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///nullable_supertypes.dart" as prefix;
+
+typedef AAlias = self::A?;
+typedef BAlias = self::B?;
+typedef CAlias = self::C?;
+typedef TAlias<T extends core::Object? = dynamic> = T?;
+class A extends core::Object {
+ synthetic constructor •() → self::A
+ : super core::Object::•()
+ ;
+}
+class B extends core::Object {
+ synthetic constructor •() → self::B
+ : super core::Object::•()
+ ;
+}
+class C extends core::Object {
+ synthetic constructor •() → self::C
+ : super core::Object::•()
+ ;
+}
+class C1 extends core::Object {
+ synthetic constructor •() → self::C1
+ : super core::Object::•()
+ ;
+}
+class C2 extends core::Object {
+ synthetic constructor •() → self::C2
+ : super core::Object::•()
+ ;
+}
+class C3 extends self::A {
+ synthetic constructor •() → self::C3
+ : super self::A::•()
+ ;
+}
+class C4 = self::A with self::B {
+ synthetic constructor •() → self::C4
+ : super self::A::•()
+ ;
+}
+abstract class _C5&A&BAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_C5&A&BAlias
+ : super self::A::•()
+ ;
+}
+class C5 extends self::_C5&A&BAlias {
+ synthetic constructor •() → self::C5
+ : super self::_C5&A&BAlias::•()
+ ;
+}
+abstract class M1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _M2&A&BAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_M2&A&BAlias
+ : super core::Object::•()
+ ;
+}
+abstract class M2 extends self::_M2&A&BAlias /*isMixinDeclaration*/ {
+}
+abstract class M3 extends self::A /*isMixinDeclaration*/ {
+}
+class D1 extends core::Object {
+ synthetic constructor •() → self::D1
+ : super core::Object::•()
+ ;
+}
+class D1a extends core::Object {
+ synthetic constructor •() → self::D1a
+ : super core::Object::•()
+ ;
+}
+class D1b extends core::Object {
+ synthetic constructor •() → self::D1b
+ : super core::Object::•()
+ ;
+}
+class D2 extends core::Object {
+ synthetic constructor •() → self::D2
+ : super core::Object::•()
+ ;
+}
+class D3 extends self::A {
+ synthetic constructor •() → self::D3
+ : super self::A::•()
+ ;
+}
+class D4 = self::A with self::B {
+ synthetic constructor •() → self::D4
+ : super self::A::•()
+ ;
+}
+abstract class _D5&A&TAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_D5&A&TAlias
+ : super self::A::•()
+ ;
+}
+class D5 extends self::_D5&A&TAlias {
+ synthetic constructor •() → self::D5
+ : super self::_D5&A&TAlias::•()
+ ;
+}
+abstract class N1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1a extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1b extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _N2&A&TAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_N2&A&TAlias
+ : super core::Object::•()
+ ;
+}
+abstract class N2 extends self::_N2&A&TAlias /*isMixinDeclaration*/ {
+}
+abstract class N3 extends self::A /*isMixinDeclaration*/ {
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.outline.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.outline.expect
new file mode 100644
index 0000000..a0cf738
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.outline.expect
@@ -0,0 +1,371 @@
+library /*isNonNullableByDefault*/;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:18: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:21: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias' can't be mixed in.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:32: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:25: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias' can't be mixed in.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:13: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:16: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:26: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:16:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C1 extends AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:18:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C2 implements AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:20:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C3 = A with BAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:22:7: Error: The type 'CAlias' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C4 = A with B implements CAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:13:9: Context: The issue arises via this type alias.
+// typedef CAlias = C?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:24:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C5 extends A with BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:26:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M1 on AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:28:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M2 on A, BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:30:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M3 on A implements BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:7: Error: The type 'TAlias<C>' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///nullable_supertypes.dart" as prefix;
+
+typedef AAlias = self::A?;
+typedef BAlias = self::B?;
+typedef CAlias = self::C?;
+typedef TAlias<T extends core::Object? = dynamic> = T?;
+class A extends core::Object {
+ synthetic constructor •() → self::A
+ ;
+}
+class B extends core::Object {
+ synthetic constructor •() → self::B
+ ;
+}
+class C extends core::Object {
+ synthetic constructor •() → self::C
+ ;
+}
+class C1 extends core::Object {
+ synthetic constructor •() → self::C1
+ ;
+}
+class C2 extends core::Object {
+ synthetic constructor •() → self::C2
+ ;
+}
+class C3 extends self::A {
+ synthetic constructor •() → self::C3
+ : super self::A::•()
+ ;
+}
+class C4 = self::A with self::B {
+ synthetic constructor •() → self::C4
+ : super self::A::•()
+ ;
+}
+abstract class _C5&A&BAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_C5&A&BAlias
+ : super self::A::•()
+ ;
+}
+class C5 extends self::_C5&A&BAlias {
+ synthetic constructor •() → self::C5
+ ;
+}
+abstract class M1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _M2&A&BAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_M2&A&BAlias
+ ;
+}
+abstract class M2 extends self::_M2&A&BAlias /*isMixinDeclaration*/ {
+}
+abstract class M3 extends self::A /*isMixinDeclaration*/ {
+}
+class D1 extends core::Object {
+ synthetic constructor •() → self::D1
+ ;
+}
+class D1a extends core::Object {
+ synthetic constructor •() → self::D1a
+ ;
+}
+class D1b extends core::Object {
+ synthetic constructor •() → self::D1b
+ ;
+}
+class D2 extends core::Object {
+ synthetic constructor •() → self::D2
+ ;
+}
+class D3 extends self::A {
+ synthetic constructor •() → self::D3
+ : super self::A::•()
+ ;
+}
+class D4 = self::A with self::B {
+ synthetic constructor •() → self::D4
+ : super self::A::•()
+ ;
+}
+abstract class _D5&A&TAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_D5&A&TAlias
+ : super self::A::•()
+ ;
+}
+class D5 extends self::_D5&A&TAlias {
+ synthetic constructor •() → self::D5
+ ;
+}
+abstract class N1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1a extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1b extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _N2&A&TAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_N2&A&TAlias
+ ;
+}
+abstract class N2 extends self::_N2&A&TAlias /*isMixinDeclaration*/ {
+}
+abstract class N3 extends self::A /*isMixinDeclaration*/ {
+}
+static method main() → dynamic
+ ;
diff --git a/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.transformed.expect b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.transformed.expect
new file mode 100644
index 0000000..5dac514
--- /dev/null
+++ b/pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart.weak.transformed.expect
@@ -0,0 +1,383 @@
+library /*isNonNullableByDefault*/;
+//
+// Problems in library:
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:18: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:21: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:19: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias' can't be mixed in.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:32: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:25: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias' can't be mixed in.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:13: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:14: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:16: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:26: Error: Can't use a typedef denoting a type variable as a constructor, nor for a static member access.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:16: Context: This is the type variable ultimately denoted.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:16:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C1 extends AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:18:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C2 implements AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:20:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C3 = A with BAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:22:7: Error: The type 'CAlias' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C4 = A with B implements CAlias;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:13:9: Context: The issue arises via this type alias.
+// typedef CAlias = C?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:24:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class C5 extends A with BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:26:7: Error: The type 'AAlias' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M1 on AAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:11:9: Context: The issue arises via this type alias.
+// typedef AAlias = A?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:28:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M2 on A, BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:30:7: Error: The type 'BAlias' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin M3 on A implements BAlias {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:12:9: Context: The issue arises via this type alias.
+// typedef BAlias = B?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:32:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1 extends TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:34:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1a extends prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:36:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D1b extends TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:38:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D2 implements TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:40:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D3 = A with TAlias<B>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:42:7: Error: The type 'TAlias<C>' which is an alias of 'C?' can't be used as supertype because it is nullable.
+// - 'C' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D4 = A with B implements TAlias<C>;
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:44:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// class D5 extends A with TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:46:7: Error: The type 'TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1 on TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:48:7: Error: The type 'prefix.TAlias<A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1a on prefix.TAlias<A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:50:7: Error: The type 'TAlias<prefix.A>' which is an alias of 'A?' can't be used as supertype because it is nullable.
+// - 'A' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N1b on TAlias<prefix.A> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:52:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N2 on A, TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:54:7: Error: The type 'TAlias<B>' which is an alias of 'B?' can't be used as supertype because it is nullable.
+// - 'B' is from 'pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart'.
+// mixin N3 on A implements TAlias<B> {}
+// ^
+// pkg/front_end/testcases/nonfunction_type_aliases/nullable_supertypes.dart:14:9: Context: The issue arises via this type alias.
+// typedef TAlias<T> = T?;
+// ^
+//
+import self as self;
+import "dart:core" as core;
+
+import "org-dartlang-testcase:///nullable_supertypes.dart" as prefix;
+
+typedef AAlias = self::A?;
+typedef BAlias = self::B?;
+typedef CAlias = self::C?;
+typedef TAlias<T extends core::Object? = dynamic> = T?;
+class A extends core::Object {
+ synthetic constructor •() → self::A
+ : super core::Object::•()
+ ;
+}
+class B extends core::Object {
+ synthetic constructor •() → self::B
+ : super core::Object::•()
+ ;
+}
+class C extends core::Object {
+ synthetic constructor •() → self::C
+ : super core::Object::•()
+ ;
+}
+class C1 extends core::Object {
+ synthetic constructor •() → self::C1
+ : super core::Object::•()
+ ;
+}
+class C2 extends core::Object {
+ synthetic constructor •() → self::C2
+ : super core::Object::•()
+ ;
+}
+class C3 extends self::A {
+ synthetic constructor •() → self::C3
+ : super self::A::•()
+ ;
+}
+class C4 extends self::A implements self::B /*isEliminatedMixin*/ {
+ synthetic constructor •() → self::C4
+ : super self::A::•()
+ ;
+}
+abstract class _C5&A&BAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_C5&A&BAlias
+ : super self::A::•()
+ ;
+}
+class C5 extends self::_C5&A&BAlias {
+ synthetic constructor •() → self::C5
+ : super self::_C5&A&BAlias::•()
+ ;
+}
+abstract class M1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _M2&A&BAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_M2&A&BAlias
+ : super core::Object::•()
+ ;
+}
+abstract class M2 extends self::_M2&A&BAlias /*isMixinDeclaration*/ {
+}
+abstract class M3 extends self::A /*isMixinDeclaration*/ {
+}
+class D1 extends core::Object {
+ synthetic constructor •() → self::D1
+ : super core::Object::•()
+ ;
+}
+class D1a extends core::Object {
+ synthetic constructor •() → self::D1a
+ : super core::Object::•()
+ ;
+}
+class D1b extends core::Object {
+ synthetic constructor •() → self::D1b
+ : super core::Object::•()
+ ;
+}
+class D2 extends core::Object {
+ synthetic constructor •() → self::D2
+ : super core::Object::•()
+ ;
+}
+class D3 extends self::A {
+ synthetic constructor •() → self::D3
+ : super self::A::•()
+ ;
+}
+class D4 extends self::A implements self::B /*isEliminatedMixin*/ {
+ synthetic constructor •() → self::D4
+ : super self::A::•()
+ ;
+}
+abstract class _D5&A&TAlias extends self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_D5&A&TAlias
+ : super self::A::•()
+ ;
+}
+class D5 extends self::_D5&A&TAlias {
+ synthetic constructor •() → self::D5
+ : super self::_D5&A&TAlias::•()
+ ;
+}
+abstract class N1 extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1a extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class N1b extends core::Object /*isMixinDeclaration*/ {
+}
+abstract class _N2&A&TAlias extends core::Object implements self::A /*isAnonymousMixin*/ {
+ synthetic constructor •() → self::_N2&A&TAlias
+ : super core::Object::•()
+ ;
+}
+abstract class N2 extends self::_N2&A&TAlias /*isMixinDeclaration*/ {
+}
+abstract class N3 extends self::A /*isMixinDeclaration*/ {
+}
+static method main() → dynamic {}
diff --git a/pkg/front_end/testcases/textual_outline.status b/pkg/front_end/testcases/textual_outline.status
index b30bc2c..6585a37 100644
--- a/pkg/front_end/testcases/textual_outline.status
+++ b/pkg/front_end/testcases/textual_outline.status
@@ -132,6 +132,7 @@
nonfunction_type_aliases/issue41501: FormatterCrash
nonfunction_type_aliases/issue42446: FormatterCrash
nonfunction_type_aliases/issue45051: FormatterCrash
+nonfunction_type_aliases/nullable_supertypes: FormatterCrash
nonfunction_type_aliases/unaliased_bounds_checks_in_constructor_calls: FormatterCrash
rasta/bad_redirection: FormatterCrash
rasta/issue_000032: FormatterCrash
