| // Copyright (c) 2021, 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. | |
| class D1 {} | |
| class D2 {} | |
| class D implements D1, D2 {} | |
| class A { | |
| void m(covariant D d) {} | |
| } | |
| abstract class B1 { | |
| void m(D1 d1); | |
| } | |
| abstract class B2 { | |
| void m(D2 d2); | |
| } | |
| main() {} |