| // 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. |
| |
| import "package:expect/expect.dart"; |
| |
| T f<T>(T x) => x; |
| |
| void test(T Function<T>(T) f) { |
| int Function(int) intFunc = f.call; |
| dynamic intFuncDynamic = intFunc; |
| Expect.isTrue(intFuncDynamic is int Function(int)); |
| Expect.isFalse(intFuncDynamic is String Function(String)); |
| Expect.equals(intFuncDynamic(1), 1); |
| Expect.throwsTypeError(() { |
| intFuncDynamic('oops'); |
| }); |
| String Function(String) stringFunc = f.call; |
| dynamic stringFuncDynamic = stringFunc; |
| Expect.isTrue(stringFuncDynamic is String Function(String)); |
| Expect.isFalse(stringFuncDynamic is int Function(int)); |
| Expect.equals(stringFuncDynamic('hello'), 'hello'); |
| Expect.throwsTypeError(() { |
| stringFuncDynamic(1); |
| }); |
| } |
| |
| main() { |
| test(f); |
| } |