| // Copyright (c) 2024, 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. | |
| abstract class A<X> {} | |
| mixin M1<Y> on A<void Function<Z>(void Function(Z, Y))> {} | |
| class B1 extends A<void Function<Z>(void Function(Z, int))> with M1 {} // Ok. |