| /* |

| * 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 Iterable<Object>, then the inferred set element |

| * type of element is T where T is the type such that Iterable<T> is a |

| * superinterface of S (the result of constraint matching for X using the |

| * constraint S <: Iterable<X>). |

| * |

| * @description Checks that if S is a non-Null subtype of Iterable<Object?>, |

| * then the inferred set element type of element is T where T is the type such |

| * that Iterable<T> is a superinterface of S |

| * @author sgrekhov@unipro.ru |

| * @static-warning |

| */ |

| import "../../Utils/expect.dart"; |

| |

| void test1<T extends Iterable<num>>(T t) { |

| var s1 = {...t}; |

| var s2 = {...?t}; |

| Expect.isTrue(s1 is Set<num>); |

| Expect.isFalse(s1 is Set<int>); |

| Expect.isTrue(s2 is Set<num>); |

| Expect.isFalse(s2 is Set<int>); |

| } |

| |

| void test2<T extends Iterable<Object>>(T t) { |

| var s1 = {...t}; |

| var s2 = {...?t}; |

| Expect.isTrue(s1 is Set<Object>); |

| Expect.isFalse(s1 is Set<num>); |

| Expect.isTrue(s2 is Set<Object>); |

| Expect.isFalse(s2 is Set<num>); |

| } |

| |

| main() { |

| int x = 2; |

| test1([1, x, 3, 4]); |

| test2([1.0, 2.0, x, 4]); |

| } |