| // Copyright (c) 2017, 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 = 2.9 |
| |
| class A { |
| void foo() {} |
| } |
| |
| abstract class I { |
| void foo([x]); |
| } |
| |
| class /*@compile-error=unspecified*/ B extends A implements I { |
| // This class declaration violates soundness, since it allows `new |
| // B().foo(42)`, which would lead to invalid arguments being passed to A.foo. |
| } |
| |
| void f(B b) { |
| b.foo(); |
| } |
| |
| main() { |
| f(new B()); |
| } |
