| // 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 [e is Null] expression. |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-strong |
| |
| class A { |
| foo() {} |
| } |
| |
| class B<T> { |
| bar() {} |
| } |
| |
| dynamic init(x) => x; |
| |
| main() { |
| A? a = init(A()); |
| if (a is Null) { |
| } else { |
| a.foo(); |
| A a1 = a; |
| } |
| |
| B? b1 = init(B()); |
| if (b1 is Null) { |
| } else { |
| b1.bar(); |
| B b11 = b1; |
| } |
| |
| B<int>? b2 = init(B<int>()); |
| if (b2 is Null) { |
| } else { |
| b2.bar(); |
| B<int> b22 = b2; |
| } |
| |
| int? i = init(0); |
| if (i is Null) { |
| } else { |
| i.isOdd; |
| int i1 = i + 2; |
| } |
| } |