| /* |
| * Copyright (c) 2021, 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 type T is assignable to a type S if T is dynamic, or if T is a |
| * subtype of S. |
| * |
| * @description Checks that a type T is assignable to a type S if T is dynamic, |
| * or if T is a subtype of S. Test type aliases |
| * |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=nonfunction-type-aliases |
| // Requirements=nnbd-weak |
| import "../../../../Utils/expect.dart"; |
| class A {} |
| class C extends A {} |
| |
| typedef AAlias = A; |
| typedef CAlias = C; |
| |
| main() { |
| dynamic d = "Lily was here"; |
| AAlias a1 = new A(); |
| AAlias a2 = new C(); |
| Expect.throws(() { |
| AAlias a3 = d; |
| }); |
| |
| AAlias? a4 = new A(); |
| AAlias? a5 = new C(); |
| Expect.throws(() { |
| AAlias? a6 = d; |
| }); |
| } |