| // 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 they have different number of required parameters. |
| * @author rodionov |
| */ |
| import "../../../Utils/expect.dart"; |
| |
| typedef t1(int x); |
| typedef t2(int x, int y); |
| |
| main() { |
| Expect.isFalse(() {} is t1); |
| Expect.isFalse((int x, var y) {} is t1); |
| Expect.isFalse((int x, int y) {} is t1); |
| Expect.isFalse(({required int x}) {} is t1); |
| Expect.isFalse(({required var x}) {} is t1); |
| |
| Expect.isFalse(() {} is t2); |
| Expect.isFalse((int x) {} is t2); |
| Expect.isFalse((int y) {} is t2); |
| Expect.isFalse((int x, {required int y}) {} is t2); |
| Expect.isFalse(({required int x, required int y}) {} is t2); |
| Expect.isFalse((int x, int y, int z) {} is t2); |
| } |