/*
 * 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 the null check operator (!) on an
 * expression of type T if T is strictly non-nullable
 *
 * @description It is a warning to use the null check operator (!) on an
 * expression of type T if T is strictly non-nullable. Test FutureOr<Function>
 * @author sgrekhov@unipro.ru
 * @issue 39598
 */

import "dart:async";

void foo() {}

main() {
  FutureOr<Function> f = foo;
  f!;
//^
// [cfe] Operand of null-aware operation '!' has type 'FutureOr<Function>' which excludes null.
// ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
}