| // 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 Finally, we define inference on a setOrMapLiteral collection as |
| /// follows: |
| /// ... |
| /// Else, if collection is unambiguously a map literal where P is Map<Pk, Pv>: |
| /// |
| /// If Pk is ? then the static key type of collection is K where K is the least |
| /// upper bound of the inferred key types of the elements. |
| /// |
| /// @description Checks that if collection is unambiguously a map literal and Pk |
| /// is ? then the static key type of collection is K where K is the least upper |
| /// bound of the inferred key types of the elements. |
| /// @author sgrekhov@unipro.ru |
| /// @issue 43280 |
| |
| import "../../Utils/expect.dart"; |
| |
| class C<K extends num, V> { |
| test(K k, V v) { |
| var m = {k: v, 1: 2}; |
| Expect.isTrue(m is Map<num, Object?>); |
| Expect.isFalse(m is Map<num, int?>); |
| Expect.runtimeIsType<Map<num, Object?>>(m); |
| Expect.runtimeIsNotType<Map<num, int?>>(m); |
| } |
| } |
| |
| main() { |
| C<int, int?>().test(3, 4); |
| C<int, int?>().test(3, null); |
| } |