| // 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 Assertion means that as long function type t1 has no more |
| /// required parameters and no less total positional parameters than function |
| /// type t2, types of extra positional parameters of t1 do not matter for subtype |
| /// relation. Under this condition, checks that t1 is subtype of t2 if their |
| /// parameter types are assignable on t2 parameters set range, and t1 has extra |
| /// optional positional parameters of some arbitary type. |
| /// @author ilya |
| |
| import "../../../Utils/expect.dart"; |
| |
| typedef t1(int x); |
| typedef t2(int x, int y); |
| |
| class Whatever {} |
| |
| main() { |
| Expect.isTrue(([int x = 0, Whatever? w]) {} is t1); |
| Expect.isTrue(([var x, Whatever? w, Whatever? w2]) {} is t1); |
| Expect.isTrue((int x, [int y = 0, Whatever? w]) {} is t2); |
| Expect.isTrue((int x, [int y = 0, Whatever? w, Whatever? w2]) {} is t2); |
| Expect.isTrue(([int x = 42, int y = 0, Whatever? w, Whatever? w2]) {} is t2); |
| } |