| /* |

| * 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 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 |

| */ |

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

| |

| main() { |

| var s1 = [1, 2, 3, 4]; |

| var x1 = {...s1}; |

| Expect.isTrue(x1 is Set<int>); |

| |

| var s2 = [1.0, 2.0, 3, 4]; |

| var x2 = {...s2}; |

| Expect.isTrue(x2 is Set<num>); |

| Expect.isFalse(x2 is Set<int>); |

| Expect.isFalse(x2 is Set<double>); |

| |

| var s3 = [1.0, 2, "3", 4]; |

| var x3 = {...s3}; |

| Expect.isTrue(x3 is Set<Object>); |

| Expect.isFalse(x3 is Set<num>); |

| Expect.isFalse(x3 is Set<String>); |

| } |