| /* |
| * 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 In a legacy library, none of the new syntax introduced by this |
| * proposal is available, and it is a static error if it is used. |
| * |
| * @description Check that it is a static error if NNBD syntax is used in a |
| * pre-NNBD legacy library |
| * @author sgrekhov@unipro.ru |
| */ |
| // @dart=2.4 |
| // SharedOptions=--enable-experiment=non-nullable |
| |
| class C { |
| int operator[](int index) => index * 2; |
| } |
| |
| main() { |
| C? c = null; |
| c?.[42]; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
