/*
 * 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 T be the static type of e and let f be the immediately
 * enclosing function.
 *    It is a static type warning if the body of f is marked async and the type
 * Future<flatten(T)> may not be assigned to the declared return type of f.
 * Otherwise, it is a static type warning if T may not be assigned to the
 * declared return type of f.
 *
 * @description Checks that no static warning occurs if the type of e may be
 * assigned to the declared return type of the immediately enclosing function.
 *
 * @static-clean
 * @author rodionov
 */

abstract class I {}
class S implements I {}
class C extends S {}

S foo() {  return new C(); }
I foo2() { return new C(); }
C bar() {  return new C(); }

main() {
  foo();
  foo2();
  bar();
}