| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion If both the extension and the method is generic, then inference |
| /// must infer the extension type parameters first, to figure out whether the |
| /// extension applies, and only then start inferring method type parameters. As |
| /// mentioned above, the inference is similar to other cases of chained inference. |
| /// @description Check that two-step type inference forces correct type parameter |
| /// choice and error is thrown if method parameter is of incorrect type. |
| /// @author iarkh@unipro.ru |
| |
| extension SuperList<T> on List<T> { |
| void checkme1<R>(R i) {} |
| void checkme2<R extends T>(R i) {} |
| } |
| |
| main() { |
| List<String> list = []; |
| list.checkme1(42); |
| list.checkme1<int>(42); |
| list.checkme2(42); //# 01: compile-time error |
| list.checkme2<int>(42); //# 02: compile-time error |
| } |