| // 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 <T extends Object> |
| /// @author sgrekhov@unipro.ru |
| /// @issue 39598 |
| /// @issue 39714 |
| |
| test<T extends Object>(T t) { |
| t?.toString(); |
| // ^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| t?..toString(); |
| // ^^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| t ?? t; |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| t ??= t; |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| List<T> clist = [t, t]; |
| List<T> alist = [t, t, ...? clist]; |
| // ^^^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| } |
| |
| main() { |
| test<String>("Lily was here"); |
| } |
