| /* |
| * 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 T] where [e] |
| * has static type [T?] promotes the type of [e] to [T] in the [true] |
| * continuation, and to [Null] in the [false] continuation. |
| * |
| * @description Check that type of [e] is promoted to [T] in the [true] |
| * condition. Test [e is T] expression. Test type aliases |
| * @author iarkh@unipro.ru |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable,nonfunction-type-aliases |
| // Requirements=nnbd-strong |
| |
| class A { |
| foo() {} |
| } |
| |
| class B<T> { |
| bar() {} |
| } |
| |
| typedef AAlias = A?; |
| typedef BAlias1 = B?; |
| typedef BAlias2 = B<int>?; |
| typedef IntAlias = int?; |
| |
| main() { |
| AAlias a = new A(); |
| if (a is A) { |
| a.foo(); |
| A a1 = a; |
| } |
| |
| BAlias1 b1 = new B(); |
| if (b1 is B) { |
| b1.bar(); |
| B b11 = b1; |
| } |
| |
| BAlias2 b2 = new B<int>(); |
| if (b2 is B<int>()) { |
| b2.bar(); |
| B b22 = b2; |
| } |
| |
| IntAlias i = 42; |
| if (i is int) { |
| i.isOdd; |
| int j = i + 10; |
| } |
| } |