| // 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 function type (T1,...Tk,[Tk+1,...,Tn+m]) -> T is a subtype of |
| * the function type (S1,...,Sk+j,[Sk+j+1,...,Sn]) -> S, if all of the following |
| * conditions are met: |
| * 1. Either |
| * • S is void, or |
| * • T <=> S. |
| * 2. ∀i ∈ 1..n, Ti ⇐⇒ Si. |
| * @description Checks that function type t1 is a subtype of function type t2 |
| * even if t1 has less required parameters but accepts the same or greater |
| * number of required and optional parameters. |
| * @author iefremov |
| */ |
| import "../../../Utils/expect.dart"; |
| |
| typedef t1(int x); |
| typedef t2(int x, int y); |
| |
| main() { |
| Expect.isTrue(([int x = 42]) {} is t1); |
| Expect.isTrue(([var x]) {} is t1); |
| Expect.isTrue((int x, [int y = 42]) {} is t2); |
| Expect.isTrue(([int x = 4, int y = 2]) {} is t2); |
| } |