| /* |
| * Copyright (c) 2019, 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 Since the spread is unpacked and its individual elements added to |
| * the containing collection, we don't require the spread expression itself to |
| * be assignable to the collection's type. For example, this is allowed: |
| * |
| * var numbers = <num>[1, 2, 3]; |
| * var ints = <int>[...numbers]; |
| * |
| * This works because the individual elements in numbers do happen to have the |
| * right type even though the list that contains them does not. As long as the |
| * spread object is "spreadable" — it implements [Iterable] — there is no |
| * static error. |
| * @description Checks that it's possible to have the spread expression which is |
| * not assignable to the collection type for the map. |
| * @author iarkh@unipro.ru |
| */ |
| |
| import "../../Utils/expect.dart"; |
| |
| main() { |
| var numbers = <num, num>{1: 1, 2: 2, 3: 3}; |
| Expect.mapEquals({1: 1, 2: 2, 3: 3}, <int, int>{...numbers}); |
| |
| var objects = <Object, Object>{2: 22, 7: 77, 9: 99}; |
| Expect.mapEquals({2: 22, 7: 77, 9: 99}, <int, int>{...objects}); |
| |
| var a; |
| Expect.throws(() => a = <String, int>{...objects}); |
| |
| dynamic strings = <String>[]; |
| Expect.throws(() => a = <int, int>{11: 12, ...strings}); |
| |
| |
| numbers = <num, num>{1: 1, 2: 2, 3: 3}; |
| Expect.mapEquals({1: 1, 2: 2, 3: 3}, <int, int>{...?numbers}); |
| |
| objects = <Object, Object>{2: 22, 7: 77, 9: 99}; |
| Expect.mapEquals({2: 22, 7: 77, 9: 99}, <int, int>{...?objects}); |
| |
| Expect.throws(() => a = <String, int>{...?objects}); |
| |
| strings = <String>[]; |
| Expect.throws(() => a = <int, int>{11: 12, ...?strings}); |
| |
| } |