// 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 collection Spec:
 * A [spreadElement] starting with [...?] is a constant element if its
 * expression is constant and it evaluates to [null] or a constant [List], [Set]
 * or [Map] instance originally created by a list, set or map literal. It is a
 * potentially constant element if the expression is potentially constant
 * expression.
 * @description: Checks that constant set spread [...?] element can be constant
 * list or set or [null].
 * @author iarkh@unipro.ru
 */

List? l = [];
Set? s = {};

const Map? m1 = {1: 1};
Map? m2 = {2: 2};

const int? i1 = 25;
int? i2 = 25;

main() {
  const Set res1 = const {...?l};
// [error line 28, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  const Set res2 = const {...?s};
// [error line 32, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  const Set res3 = const {...?m1};
// [error line 36, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  const Set res4 = const {...?m2};
// [error line 40, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  const Set res5 = const {...?i1};
// [error line 44, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  const Set res6 = const {...?i2};
// [error line 48, column 0]
// [analyzer] unspecified
// [cfe] unspecified
}