| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion The [==] operator in constant expressions was defined such that |
| /// [e1 != null] was only allowed if [e1] had one of the "primitive" system |
| /// types. Users had to rewrite their code to [!identical(e1, null)]. This was |
| /// changed so that the [==] expression is always allowed as long as one of the |
| /// operands is [null]. |
| /// @description Checks that compile-time exception is thrown if one of the [==] |
| /// operand is [null] and another one is not a potentially constant. |
| /// @author iarkh@unipro.ru |
| |
| |
| class A {} |
| A a = new A(); |
| |
| class B { |
| final String option; |
| const B(String str) : assert(a == null), option = str ?? "undefined"; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| |
| main() { |
| } |
