| // 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 The function type (T1, ... Tn, {Tx1 x1, ..., Txk xk}) -> T is a |
| /// subtype of the function type (S1, ..., Sn, {Sy1 y1, ..., Sym ym }) -> S, if |
| /// all of the following conditions are met: |
| /// 1. Either |
| /// • S is void, Or |
| /// • T ⇐⇒ S. |
| /// 2. ∀i ∈ 1..n, Ti ⇐⇒ Si . |
| /// 3. k ≥ m and yi ∈ {x1 , ..., xk }, i ∈ 1..m. |
| /// 4. For all yi ∈ {y1 , ..., ym }, yi = xj ⇒ Tj ⇐⇒ Si. |
| /// @description Checks that function type t1 is not a subtype of function type |
| /// t2 if its named optional parameters are a smaller subset of t2's. |
| /// @author rodionov |
| |
| import "../../../Utils/expect.dart"; |
| |
| typedef t1({int x}); |
| typedef t2({int x, int y}); |
| typedef t3({int x, int y, int z}); |
| |
| main() { |
| Expect.isFalse(() {} is t1); |
| |
| Expect.isFalse(({int x = 42}) {} is t2); |
| Expect.isFalse(({var x}) {} is t2); |
| |
| Expect.isFalse(({int x = 42, int y = 42}) {} is t3); |
| Expect.isFalse(({var x, var y}) {} is t3); |
| } |