| // Copyright (c) 2016, 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 |
| |
| // Check function subtyping of type arguments. These cases use typedefs as type |
| // arguments, and the typedefs have type parameters that are used more than |
| // once. |
| |
| import 'package:expect/expect.dart'; |
| |
| typedef A F<A>(A arg1, A arg2); |
| typedef B G<A, B>(B arg1, B arg2); |
| |
| typedef Set<A> FS<A>(Set<A> arg1, Set<A> arg2); |
| |
| @pragma('dart2js:noInline') |
| @pragma('dart2js:assumeDynamic') |
| dyn(x) => x; |
| |
| class CheckEnv<X, Y> { |
| test(bool intX) { |
| Expect.isTrue(<F<X>>[] is! List<F>); |
| Expect.isTrue(<F<X>>[] is List<F<X>>); |
| Expect.isTrue(<F<X>>[] is List<G<Y, X>>); |
| |
| Expect.isTrue(dyn(<F<X>>[]) is! List<F>); |
| Expect.isTrue(dyn(<F<X>>[]) is List<F<X>>); |
| Expect.isTrue(dyn(<F<X>>[]) is List<G<Y, X>>); |
| |
| Expect.isFalse(<F<X>>[] is List<F<Y>>); |
| Expect.isFalse(<F<X>>[] is List<G<X, Y>>); |
| |
| Expect.isFalse(dyn(<F<X>>[]) is List<F<Y>>); |
| Expect.isFalse(dyn(<F<X>>[]) is List<G<X, Y>>); |
| |
| Expect.isFalse(dyn(<FS<X>>[]) is List<FS>); |
| Expect.isFalse(dyn(<FS<X>>[]) is List<FS<Null>>); |
| Expect.isTrue(dyn(<FS<X>>[]) is List<FS<X>>); |
| if (intX) { |
| Expect.isTrue(dyn(<FS<X>>[]) is List<FS<int>>); |
| Expect.isTrue(dyn(<FS<int>>[]) is List<FS<X>>); |
| Expect.isFalse(dyn(<FS<Y>>[]) is List<FS<int>>); |
| Expect.isFalse(dyn(<FS<int>>[]) is List<FS<Y>>); |
| } |
| } |
| } |
| |
| main() { |
| Expect.isTrue(<F<int>>[] is List<F<int>>); |
| Expect.isTrue(dyn(<F<int>>[]) is List<F<int>>); |
| Expect.isTrue(<F<int>>[] is List<G<bool, int>>); |
| Expect.isTrue(dyn(<F<int>>[]) is List<G<bool, int>>); |
| |
| new CheckEnv<int, String>().test(true); |
| new CheckEnv<String, int>().test(false); |
| } |