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// 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 From the Unified collections Spec:
/// We require that at least one component unambiguously determine the literal
/// form, otherwise it is a compile-time error. So, given:
/// dynamic x = <int, int>{};
/// Iterable l = [];
/// Map m = {};
/// Then:
/// {...x} // Static error, because it is ambiguous.
/// {...x, ...l} // Statically a set, runtime error when spreading x.
/// {...x, ...m} // Statically a map, no runtime error.
/// {...l, ...m} // Static error, because it must be both a set and a map.
/// @description Checks some dynamic cases of the type inference
/// @author
import "../../Utils/expect.dart";
main() {
dynamic set1 = <int>{};
dynamic set2 = <int>{};
dynamic map1 = <int, int>{};
dynamic map2 = <int, int>{};
Map res;
Expect.throws(() => res = {...map1, ...set1});
Expect.throws(() => res = {...set1, ...map1});
Expect.throws(() => res = {...set1, ...set2});
Map res1 = {...map1, ...map2};