| // 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 check of the form [e == null] or of the form [e is Null] where |
| /// [e] has static type [T] promotes the type of [e] to [Null] in the [true] |
| /// continuation, and to [NonNull(T)] in the [false] continuation. |
| /// |
| /// @description Check that [e] is promoted to [NonNull(T)] in the [false] |
| /// condition. Test type aliases. |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-strong |
| |
| class A { |
| foo() {} |
| } |
| |
| typedef AAlias1 = A?; |
| typedef AAlias2 = AAlias1?; |
| |
| dynamic init(x) => x; |
| |
| main() { |
| AAlias1 a1 = init(A()); |
| if (a1 is Null) { |
| } else { |
| a1.foo(); |
| AAlias1 a11 = a1; |
| a11.foo(); |
| } |
| |
| if (a1 == null) { |
| } else { |
| a1.foo(); |
| AAlias1 a11 = a1; |
| } |
| |
| AAlias2? a2 = init(A()); |
| if (a2 is Null) { |
| } else { |
| a2.foo(); |
| AAlias1 a22 = a1; |
| } |
| |
| if (a2 == null) { |
| } else { |
| a2.foo(); |
| AAlias1 a22 = a1; |
| } |
| } |