// Copyright (c) 2011, 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 Let S be the runtime type of o.
///    • If the body of f is marked async it is a compile type error if o is not
/// null and Future<S> is not a subtype of the actual return type of f.
///    • Otherwise, it is a compile type error if o is not null and the runtime
/// type of o is not a subtype of the actual return type of f.
///
/// @description Checks that it's not an error in any mode if o is null.
///
/// @author kaigorodov


var r = null;

int? foo() { return r; }

main() {
  foo();
}