// Copyright (c) 2016, 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 A function type T may be assigned to a function type S, written
/// T ⇐⇒ S, iff T <: S.
/// @description Checks that a function type T may be assigned to a function type
/// S, iff T <: S.
/// @author ngl@unipro.ru

class A {}
class B extends A {}

class X {}

typedef B t1(B b);

main() {
  t1 x1x = (X x) => new B();
//         ^
// [analyzer] unspecified
// [cfe] unspecified
}