// 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.

// @dart = 2.9

import 'dart:async';
import 'package:expect/expect.dart';

main() {
  Expect.subtype<void Function(), FutureOr<void Function()>>();
}