// Copyright (c) 2017, 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.

/*@testedFeatures=inference*/
library test;

import 'dart:async';

main() async {
  var /*@ type=() ->* Future<Null?>* */ f = /*@ returnType=Future<Null?>* */ () async {
    return null;
  };
  Future y = f();
  Future<String> z = f();
  String s = await f();
}