// 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 map spread [...?] element can only be
/// constant map or null
/// @author iarkh@unipro.ru


const l1 = [];
List l2 = [];

const s1 = {11};
Set s2 = {};

Map m = {2: 2};

const int i1 = 25;
int i2 = 25;

main() {
  const Map res1= const {...?l1};  //# 01: compile-time error
  const Map res2 = const {...?l2}; //# 02: compile-time error
  const Map res3 = const {...?s1}; //# 03: compile-time error
  const Map res4 = const {...?s2}; //# 04: compile-time error
  const Map res5 = const {...?m};  //# 05: compile-time error
  const Map res6 = const {...?i1}; //# 06: compile-time error
  const Map res7 = const {...?i2}; //# 07: compile-time error
}