| // Copyright (c) 2019, 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 I0 {} | |
| class A {} | |
| class B extends A implements I0 {} | |
| class C { | |
| void f(B x) {} | |
| } | |
| abstract class I { | |
| void f(covariant A x); | |
| } | |
| class D extends C implements I {} | |
| // ^ | |
| // [analyzer] COMPILE_TIME_ERROR.INVALID_IMPLEMENTATION_OVERRIDE | |
| // [cfe] unspecified | |
| main() {} |