| /* |
| * 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 |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // Requirements=nnbd-strong |
| import "dart:async"; |
| |
| class A {} |
| |
| main() { |
| FutureOr<FutureOr<A>> a = new A(); |
| a?.toString(); //# 01: static type warning |
| a?..toString(); //# 02: static type warning |
| a ?? a; //# 03: static type warning |
| a ??= a; //# 04: static type warning |
| List<FutureOr<FutureOr<A>>> clist = [a, a]; |
| List<FutureOr<FutureOr<A>>> alist = [a, a, ...? clist]; //# 05: static type warning |
| } |
