| /* |
| * 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 type T is more specific than a type S, written T << S, if T is a type parameter and S is the upper bound of T. |
| * << is a partial order on types. T is a subtype of S, written T <: S, iff [⊥/Dynamic]T << S. |
| * A type T may be assigned to a type S, written T <=> S, if either T <: S or S <: T. |
| * @description Checks assignability (no static warnings) of S and T where T is type parameter and S is it's upper bound. |
| * Note: detailed checks are contained in tests for the next assertion. |
| * @static-clean |
| * @author iefremov |
| * @reviewer rodionov |
| */ |
| import "../../Utils/expect.dart"; |
| |
| class Super {} |
| |
| class Mid extends Super {} |
| |
| class Sub extends Mid {} |
| |
| class Checker<T extends Super> { |
| Checker(T t) { |
| Expect.isTrue(t is Super); |
| Super ss = t; |
| Super f() {} |
| T tt = f(); |
| } |
| } |
| |
| main() { |
| new Checker<Sub>(new Sub()); |
| } |