| // Copyright (c) 2020, 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. |
| |
| // @dart = 2.9 |
| |
| // Verifies that mixin supertypes are properly maintained even if marked as |
| // deferred (e.g., in a circular hierarchy). |
| // Regression test for: https://github.com/flutter/flutter/issues/66859 |
| |
| import "package:expect/expect.dart"; |
| |
| mixin M {} |
| |
| mixin N {} |
| |
| class A extends B<C> with M, N {} |
| |
| class B<T> {} |
| |
| class C extends A {} |
| |
| class Z extends B<Z> with M {} |
| |
| main() { |
| var z = Z(); |
| Expect.isTrue(z is B<Z>); |
| Expect.isTrue(z is M); |
| var a = A(); |
| Expect.isTrue(a is M); |
| Expect.isTrue(a is N); |
| Expect.isTrue(a is B<C>); |
| } |