| /* |
| * 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 a non-nullable receiver. |
| * |
| * @description Check it is a warning to use a null aware operator (?., ?.., ??, |
| * ??=, or ...?) on a non-nullable receiver. Test if (t != null) {…} |
| * @author sgrekhov@unipro.ru |
| * @issue 39598 |
| * @issue 39714 |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // Requirements=nnbd-strong |
| class A { |
| } |
| class C extends A {} |
| |
| main() { |
| A? a = A(); |
| C c = C(); |
| if (a != null) { |
| a?.toString(); //# 01: static type warning |
| a?..toString(); //# 02: static type warning |
| a ?? c; //# 03: static type warning |
| a ??= c; //# 04: static type warning |
| } |
| } |
