| // Copyright (c) 2022, 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=2.19 | |
| base class A {} | |
| abstract base class B {} | |
| base mixin M {} | |
| base class C = Object with M; |