| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion If a map literal has a downwards inference type of [Map<K, V>] for |
| /// some [K] and [V], then the downwards inference context type of a spread |
| /// element in that map is [Map<K, V>]. |
| /// @description Checks statically that a spread element inference context type |
| /// is [K, V] in the map literal |
| /// @author iarkh@unipro.ru |
| |
| |
| class A1 {} |
| class B1 extends A1 {} |
| class C1 extends B1 {} |
| |
| class A2 {} |
| class B2 extends A2 {} |
| class C2 extends B2 {} |
| |
| Map<K, V> getAMap<K, V>(var a, var b) { return <K, V>{a: b}; } |
| |
| main() { |
| var int_map = getAMap<int, int>(1, 2); |
| var str_map = getAMap<int, String>(1, "test"); |
| |
| var a_map = getAMap<A1, A2>(new A1(), new A2()); |
| var b_map = getAMap<B1, B2>(new B1(), new B2()); |
| var c_map = getAMap<C1, C2>(new C1(), new C2()); |
| |
| Map map1 = <int, int>{...str_map}; //# 01: compile-time error |
| Map map2 = <int, String>{1: "1", 2: "2", ...int_map, 14: "14"}; //# 02: compile-time error |
| Map map3 = <int, C2>{1 : new C2(), ...c_map}; //# 03: compile-time error |
| Map map4 = <int, A2>{...int_map}; //# 04: compile-time error |
| Map map5 = <A1, String>{...?str_map}; //# 05: compile-time error |
| } |