| // Copyright (c) 2019, 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. |
| |
| |
| /// @assertion It is a compile error if a factory returns a non-null object whose |
| /// type is not a subtype of its actual return type. |
| /// @description Checks that returning an object of subtype of M |
| /// from factory constructor M does not produce an error. Test type alias |
| /// @author sgrekhov@unipro.ru |
| |
| abstract class A { |
| A() {} |
| factory A.foo() => CAlias.foo(); |
| } |
| |
| class C extends A { |
| C.foo() {} |
| } |
| typedef CAlias = C; |
| |
| main() { |
| A.foo(); |
| } |
