/*
 * 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 v be a local variable or a formal parameter. An is-expression
 * of the form v is T shows that v has type T iff T is more specific than the
 * type S of the expression v and both T != dynamic and S != dynamic.
 * @description Checks that if neither T is more specific than S, nor
 * S is more specific than T, is-expression does not show that v has type T.
 * Formal parameter case.
 * @static-warning
 * @author ilya
 */

class C {}
class D { f(){} }

f(C x) {
  x is D ? x.f() : null;
}

main() {
  f(new C());
}