| // Copyright (c) 2019, 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 A1 {} |
| |
| extension A2 on A1 { |
| A1 method1() { |
| return this; |
| } |
| |
| A1 method2<T>(T o) { |
| print(o); |
| return this; |
| } |
| |
| A1 method3<T>([T o]) { |
| print(o); |
| return this; |
| } |
| |
| A1 method4<T>({T o}) { |
| print(o); |
| return this; |
| } |
| } |
| |
| class B1<T> {} |
| |
| extension B2<T> on B1<T> { |
| B1<T> method1() { |
| return this; |
| } |
| |
| B1<T> method2<S>(S o) { |
| print(o); |
| return this; |
| } |
| } |
| |
| main() {} |