| // 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. |
| |
| /// @assertion A class declaration, type alias, or function [G] may be generic, |
| /// that is, [G] may have formal type parameters declared. |
| /// @description Checks various correct type alias declarations. |
| /// @author iarkh@unipro.ru |
| |
| // SharedOptions=--enable-experiment=nonfunction-type-aliases |
| |
| import "../../Utils/expect.dart"; |
| |
| class A<T> {} |
| |
| class B<T1, T2> { |
| B(T1 x, T2 y) { |
| this.x = x; |
| this.y = y; |
| } |
| T1? x; |
| T2? y; |
| } |
| |
| typedef BAlias<T> = B<T, T>; |
| |
| main() { |
| BAlias b1 = B(1, 2); |
| Expect.isTrue(b1 is B); |
| Expect.isTrue(b1 is BAlias); |
| Expect.equals(1, b1.x); |
| Expect.equals(2, b1.y); |
| |
| BAlias<int> b2 = new B<int, int>(0, 100); |
| Expect.isTrue(b2 is B<int, int>); |
| Expect.isTrue(b2 is BAlias<int>); |
| Expect.equals(0, b2.x); |
| Expect.equals(100, b2.y); |
| |
| var a = new A<int?>(); |
| BAlias<A<int?>?> b3 = new B<A<int?>?, A<int?>?>(a, null); |
| Expect.isTrue(b3 is B<A<int?>?, A<int?>?>); |
| Expect.isTrue(b3 is BAlias<A<int?>?>); |
| Expect.equals(a, b3.x); |
| Expect.isNull(b3.y); |
| } |