// 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 none of these cases match, it is an error.
///
/// @description Checks that it is a compile error if none of the cases
/// (`Iterable<Object>` nor of `Map<Object, Object>`, and it's also not
/// `dynamic` nor `Null`) match
/// @author sgrekhov@unipro.ru

Set<X> foo<X>(Set<X> s) => s;

void test<T>(T t) {
  foo({...?t});
//         ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  test<Null>(null);
}