// 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.

// @dart = 2.9

/// @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 list spread [...?] element cannot be
/// non-constant, non-null and not list or set.
/// @author iarkh@unipro.ru


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

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

const int i1 = 25;
int i2 = 25;

main() {
  const List res1 = const [...?l];  //# 01: compile-time error
  const List res2 = const [...?s];  //# 02: compile-time error
  const List res3 = const [...?m1]; //# 03: compile-time error
  const List res4 = const [...?m2]; //# 04: compile-time error
  const List res5 = const [...?i1]; //# 05: compile-time error
  const List res6 = const [...?i2]; //# 06: compile-time error
}