| /* |
| * 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 To infer the type of element: |
| * ... |
| * If element is a spreadElement with expression e1: |
| * ... |
| * If P is Set<Ps> then let S be the inferred type of e1 in context Iterable<Ps>: |
| * ... |
| * If S is Null and the spread operator is ...?, then the set element type is |
| * Null. |
| * |
| * @description Checks that if S is Null and the spread operator is ...?, then |
| * the set element type is Null. |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=constant-update-2018 |
| import "../../Utils/expect.dart"; |
| |
| Set<X> foo<X>(Set<X> s) => s; |
| |
| main() { |
| Null x = null; |
| var s = foo({...?x}); |
| Expect.isTrue(s is Set<Null>); |
| } |
