| // Copyright (c) 2018, 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. | |
| // test w/ `pub run test -N prefer_mixin` | |
| class A {} | |
| class B extends Object with A {} // LINT | |
| mixin M {} | |
| class C with M {} // OK |