| /* |
| * 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 not a constant |
| * @compile-error |
| * @author iarkh@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| |
| Object str = "test"; |
| |
| main() { |
| const bool check = str is! String; |
| } |
