| // 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 It is a warning to use a null aware operator (?., ?.., ??, ??=, |
| /// or ...?) on an expression of type T if T is strictly non-nullable. |
| /// |
| /// @description Check it is a warning to use a null aware operator (?., ?.., ??, |
| /// ??=, or ...?) on a strictly non-nullable receiver. Test if (t != null) {…} |
| /// @author sgrekhov@unipro.ru |
| /// @issue 39598 |
| /// @issue 39714 |
| |
| class A {} |
| |
| class C extends A {} |
| |
| main() { |
| A? a = A(); |
| C c = C(); |
| if (a != null) { |
| a?.toString(); |
| // ^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| a?..toString(); |
| // ^^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| a ?? c; |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| a ??= c; |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| } |
| } |
