| // 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. |
| |
| // Test that generic methods can be overridden using the bound of a type |
| // variable as the type of the parameter in the overloaded method. |
| |
| library generic_methods_overriding_contravariance_test; |
| |
| import "test_base.dart"; |
| |
| class X {} |
| |
| class Y extends X {} |
| |
| class Z extends Y {} |
| |
| class C { |
| String fun<T extends Y>(T t) => "C"; |
| } |
| |
| class E extends C { |
| String fun<T extends Y>(Y y) => "E"; |
| } |
| |
| main() { |
| Y y = new Y(); |
| |
| C c = new C(); |
| E e = new E(); |
| |
| expectTrue(c.fun<Y>(y) == "C"); |
| expectTrue(e.fun<Y>(y) == "E"); |
| } |