| /* |
| * 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 ? then let S be the inferred type of e1 in context ?: |
| * ... |
| * If S is a non-Null subtype of Map<Object, Object>, then the inferred key type |
| * of element is K and the inferred value type of element is V, where K and V |
| * are the types such that Map<K, V> is a superinterface of S (the result of |
| * constraint matching for X and Y using the constraint S <: Map<X, Y>). |
| * |
| * @description Checks that if S is a non-Null subtype of Map<Object, Object>, |
| * then the inferred key type of element is K and the inferred value type of |
| * element is V, where K and V are the types such that Map<K, V> is a |
| * superinterface of S |
| * @author sgrekhov@unipro.ru |
| */ |
| import "../../Utils/expect.dart"; |
| |
| void test1<T extends Map<num, String>>(T t) { |
| var m1 = {...t}; |
| var m2 = {...?t}; |
| Expect.isTrue(m1 is Map<num, String>); |
| Expect.isTrue(m2 is Map<num, String>); |
| Expect.isFalse(m1 is Map<int, String>); |
| Expect.isFalse(m2 is Map<int, String>); |
| } |
| |
| void test2<T extends Map<Object, Object>>(T t) { |
| var m1 = {...t}; |
| var m2 = {...?t}; |
| Expect.isTrue(m1 is Map<Object, Object>); |
| Expect.isTrue(m2 is Map<Object, Object>); |
| Expect.isFalse(m1 is Map<int, String>); |
| Expect.isFalse(m2 is Map<int, String>); |
| } |
| |
| main() { |
| int x = 1; |
| test1({1: "1", 2: "2", 3: "3"}); |
| test2({1: "1", 2: "2", 3: "3"}); |
| } |