| // 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 that have bounds on type parameters can be |
| // overridden, and that type propagation can be used in such methods. |
| |
| library generic_methods_overriding_type_propagation2_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 F extends C { |
| String foobar(Z z) { |
| return "FZ"; |
| } |
| |
| String fun<T extends Y>(T t) { |
| if (t is Z) { |
| return this.foobar(t); |
| } |
| return "FY"; |
| } |
| } |
| |
| main() { |
| Y y = new Y(); |
| Z z = new Z(); |
| |
| C c = new C(); |
| F f = new F(); |
| |
| expectTrue(c.fun<Y>(y) == "C"); |
| |
| expectTrue(f.fun<Y>(y) == "FY"); |
| expectTrue(f.fun<Z>(z) == "FZ"); |
| } |