| /* |
| * 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 A logical boolean expression b of the form e1 && e2 shows that a |
| * variable v has type T if all of the following conditions hold: |
| * • Either e1 shows that v has type T or e2 shows that v has type T. |
| * • v is a local variable or formal parameter. |
| * • The variable v is not mutated in e2 or within a closure. |
| * Furthermore, if all of the following hold: |
| * • e1 shows that v has type T. |
| * • v is not mutated in either e1 , e2 or within a closure. |
| * • If the variable v is accessed by a closure in e2 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 e2. |
| * @description Checks that if v is local variable or formal parameter, either |
| * e1 or e2 shows that v has type T, but v is mutated in e2, then b does not |
| * show that v has any promoted type. Local variable case. |
| * @author ilya |
| */ |
| import '../../../Utils/expect.dart'; |
| |
| class C {} |
| |
| class D extends C { |
| f() {} |
| } |
| |
| skyIsBlue(_) => true; |
| |
| f(var y) { |
| var x = y; |
| |
| x is D && skyIsBlue(x = new C()) ? x.f() : null; |
| } |
| |
| main() { |
| Expect.throws(() => f(new D())); |
| } |