| /* |
| * 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<Function> |
| * @author sgrekhov@unipro.ru |
| * @issue 39598 |
| * @issue 39714 |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // Requirements=nnbd-strong |
| import "dart:async"; |
| |
| void foo() {} |
| |
| main() { |
| FutureOr<Function> f = foo; |
| f?.toString(); //# 01: static type warning |
| f?..toString(); //# 02: static type warning |
| f ?? f; //# 03: static type warning |
| f ??= f; //# 04: static type warning |
| List<FutureOr<Function>> clist = [f, f]; |
| List<FutureOr<Function>> alist = [f, f, ...? clist]; //# 05: static type warning |
| } |
