LanguageFeatures/Spread-collections/ConstSpreads_A10_t15.dart

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

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

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

Map? m = {2: 2};

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

main() {
  const Map res1= const {...?l1};
  //              ^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
  // [cfe] Both Iterable and Map spread elements encountered in ambiguous literal.
  const Map res2 = const {...?l2};
//                 ^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  const Map res3 = const {...?s1};
//                 ^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  const Map res4 = const {...?s2};
//                 ^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  const Map res5 = const {...?m};
//                            ^
// [analyzer] unspecified
// [cfe] unspecified
  const Map res6 = const {...?i1};
//                            ^^
// [analyzer] unspecified
// [cfe] unspecified
  const Map res7 = const {...?i2};
//                            ^^
// [analyzer] unspecified
// [cfe] unspecified
}