| // 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 static error is thrown if null-aware spread element |
| /// and map type arguments are incompatible. |
| /// @author iarkh@unipro.ru |
| |
| main() { |
| Map<num, num> numbers = <num, num>{}; |
| Map<String, num> map = <String, num>{...?numbers}; |
| // ^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
