| /* |
| * Copyright (c) 2011, 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. |
| */ |
| /** |
| * @assertion Unless explicitly stated otherwise, all ordinary rules that apply to methods |
| * apply to abstract methods. |
| * 7.1: It is a static warning if an instance method m1 overrides an instance |
| * member m2 and the type of m1 is not a subtype of the type of m2. |
| * @description Checks that a static warning is produced when the type of an abstract m1 |
| * is not a subtype of the non-abstract m2's type because their respective optional positional parameter |
| * types are not mutually assignable. |
| * @static-warning |
| * @author rodionov |
| * @reviewer kaigorodov |
| */ |
| |
| class A { |
| foo([int x]) {} |
| } |
| |
| abstract class B extends A { |
| foo([String x]); /// static type warning |
| } |
| |
| class C extends B { |
| foo([String x]) { |
| } |
| } |
| |
| main() { |
| new A().foo(2); |
| new C().foo("1"); |
| } |
| |
