| // 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 not a subtype of function type |
| /// t2 even if just one of t1's optional positional parameters has a type that is |
| /// not mutually assignable with the type of t2's corresponding positional |
| /// optional parameter. |
| /// @author iefremov |
| |
| import "../../../Utils/expect.dart"; |
| |
| class B {} |
| |
| typedef B func(Object o); |
| typedef B t1(int i, B b, Map<int, num> m, var x, [var ox, B? ob, List<num>? ol, bool? obool]); |
| |
| B f1(int i, B b, Map<int, num> m, var x, [var ox, func? ob, List<num>? ol, bool? obool]) => new B(); |
| // ^^^ func <=/=> B |
| B f2(int i, B b, Map<int, num> m, var x, [var ox, B? ob, List<B>? ol, bool? obool]) => new B(); |
| // ^^^ B <=/=> num |
| B f3(num i, B b, Map<int, num> m, var x, [var ox, B? ob, List<num>? ol, int? obool]) => new B(); |
| // ^^^ int <=/=> bool |
| |
| main() { |
| Expect.isFalse(f1 is t1); |
| Expect.isFalse(f2 is t1); |
| Expect.isFalse(f3 is t1); |
| } |