LanguageFeatures/Spread-collections/Syntax_A02_t07.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 The grammar changes for map and set are a little more complex
 * because of the potential ambiguity of collections containing only spreads.
 * The changed and new rules are:
 *
 *    setOrMapLiteral:
 *    mapLiteral |
 *    setLiteral |
 *    mapOrSetLiteral
 *    ;
 *
 *    mapLiteral:
 *    const? typeArguments? '{' mapLiteralEntryList? '}'
 *    ;
 *
 *    mapLiteralEntryList:
 *    mapLiteralEntry ( ',' mapLiteralEntry )* ','?
 *    ;
 *
 *    mapLiteralEntry:
 *    expression ':' expression |
 *    spread
 *    ;
 *
 *    setLiteral:
 *    'const'? typeArguments? '{' spreadableList '}' ;
 *
 *    mapOrSetLiteral:
 *    'const'?  '{' spread (',' spread)* '}' ;
 *
 * @description Checks that spreadable map can not be declared as constant if
 * spreadable element is not a constant.
 * @author iarkh@unipro.ru
 */

late Map map2;

main() {
  Map map1 = {1: 1, 2: 4, 3: 6};
  int i = 0;

  Map a;
  a = const {...map2};
// [error line 48, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {...map1, ...map2};
// [error line 52, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {...map2, ...map1};
// [error line 56, column 0]
// [analyzer] unspecified
// [cfe] unspecified

  a = const {...map2, 10: 2};
// [error line 61, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {10: 2, ...map2};
// [error line 65, column 0]
// [analyzer] unspecified
// [cfe] unspecified

  a = const {...map1, i: 10};
// [error line 70, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {...map1, 10: i};
// [error line 74, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {i: 10, ...map1};
// [error line 78, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  a = const {10: i, map1};
// [error line 82, column 0]
// [analyzer] unspecified
// [cfe] unspecified
}