| // 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 FutureOr<FutureOr<A>> |
| /// @author sgrekhov@unipro.ru |
| /// @issue 39598 |
| /// @issue 39714 |
| |
| |
| import "dart:async"; |
| |
| class A {} |
| |
| main() { |
| FutureOr<FutureOr<A>> a = new A(); |
| a?.toString(); |
| //^ |
| // [cfe] Operand of null-aware operation '?.' has type 'FutureOr<FutureOr<A>>' which excludes null. |
| // ^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| a?..toString(); |
| //^ |
| // [cfe] Operand of null-aware operation '?..' has type 'FutureOr<FutureOr<A>>' which excludes null. |
| // ^^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| a ?? a; |
| //^ |
| // [cfe] Operand of null-aware operation '??' has type 'FutureOr<FutureOr<A>>' which excludes null. |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| a ??= a; |
| //^ |
| // [cfe] Operand of null-aware operation '??=' has type 'FutureOr<FutureOr<A>>' which excludes null. |
| // ^ |
| // [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION |
| List<FutureOr<FutureOr<A>>> clist = [a, a]; |
| List<FutureOr<FutureOr<A>>> alist = [a, a, ...? clist]; |
| // ^^^^ |
| // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR |
| // ^ |
| // [cfe] Operand of null-aware operation '...?' has type 'List<FutureOr<FutureOr<A>>>' which excludes null. |
| } |