| /* |
| * 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 An expression of the form [e is T] or [e is! T] is accepted as a |
| * potentially and compile-time constant expression if [e] is potentially |
| * constant or compile-time constant, respectively, and [T] is a compile-time |
| * constant type. |
| * @description Checks that an expression of the form [e is! T] is accepted if |
| * [e] is a compile-time constant |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| import "../../Utils/expect.dart"; |
| |
| const i = 0; |
| const i1 = "12345"; |
| |
| class MyClass1 { |
| final int res; |
| const MyClass1() : res = (i is! int ? -1 : i); |
| } |
| |
| class MyClass2 { |
| final int res; |
| const MyClass2() : res = (i1 is! int ? -1 : i); |
| } |
| |
| main() { |
| const bool i_int = i is! int; |
| Expect.isFalse(i_int); |
| |
| const bool i_str = i is! String; |
| Expect.isTrue(i_str); |
| |
| const bool i1_int = i1 is! int; |
| Expect.isTrue(i1_int); |
| |
| const bool i1_str = i1 is! String; |
| Expect.isFalse(i1_str); |
| |
| const MyClass1 c1 = MyClass1(); |
| Expect.equals(0, c1.res); |
| |
| const MyClass2 c2 = MyClass2(); |
| Expect.equals(-1, c2.res); |
| } |