| // Copyright (c) 2016, 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 A implements C { | |
| } | |
| class B extends A { | |
| } | |
| class C extends B implements D { | |
| } | |
| class D { | |
| } | |
| main() { | |
| print(new A()); | |
| print(new B()); | |
| print(new C()); | |
| print(new D()); | |
| } |