LanguageFeatures/Spread-collections/ConstSpreads_A10_t21.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 some disambiguilty cases for sets and maps.
/// @author iarkh@unipro.ru


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

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

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

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

const n = null;

main() {
  const res1  = {...?l2};
//                   ^^
// [analyzer] unspecified
// [cfe] unspecified
  const res2  = {...?s2};
//                   ^^
// [analyzer] unspecified
// [cfe] unspecified
  const res3  = {...?l1, 123: 2};
  //            ^^^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_BOTH
  // [cfe] Both Iterable and Map spread elements encountered in ambiguous literal.
  const res4  = {14: 3, ...?s1};
  //            ^^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_BOTH
  // [cfe] Both Iterable and Map spread elements encountered in ambiguous literal.
  const res5  = {...?m1, 13};
  //            ^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_BOTH
  //                 ^
  // [cfe] Unexpected type 'Map<dynamic, dynamic>?' of a spread.  Expected 'dynamic' or an Iterable.
  const res6  = {...?m2};
//                   ^^
// [analyzer] unspecified
// [cfe] unspecified
  const res7  = {...?i1};
//              ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  const res8  = {...?i2};
//              ^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  const res9  = {...?n};
  //            ^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_EITHER
  // [cfe] Not enough type information to disambiguate between literal set and literal map.
  const res10 = {...?null};
  //            ^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_EITHER
  // [cfe] Not enough type information to disambiguate between literal set and literal map.
}