| /* |
| * 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 T is less specific than S, then is-expression |
| * does not show that v has type T. |
| * @static-clean |
| * @author ilya |
| */ |
| |
| class C {} |
| class D extends C { f(){} } |
| |
| f(D x) { |
| D y = x; |
| |
| x is C ? x.f() : null; // formal parameter |
| y is C ? y.f() : null; // local variable |
| } |
| |
| main() { |
| f(new D()); |
| } |
