| /* |
| * 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 An if statement of the form if (b) s1 else s2. |
| * If: |
| * - b shows that a variable v has type T . |
| * - v is not potentially mutated in s1 or within a closure. |
| * - If the variable v is accessed by a closure in s1 then the variable v is |
| * not potentially mutated anywhere in the scope of v. |
| * Then the type of v is known to be T in s1. |
| * @description Checks that if b shows that v has type T, but v is potentially |
| * mutated in s1, then the type of v is not known to be T in s1. |
| * @static-warning |
| * @author ilya |
| */ |
| import "../../Utils/expect.dart"; |
| |
| class C {} |
| class D extends C { |
| f() {} |
| } |
| |
| f(C x) { |
| if (x is D) { |
| x = new C(); |
| x.f(); // throws |
| } |
| } |
| |
| main() { |
| Expect.throws(() => f(new D())); |
| } |
