LanguageFeatures/Set-literals/constant_set_literals_A02_t04.dart

/*
 * Copyright (c) 2018, 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 It is a compile-time error if any of the values of the constant
 * element expressions override Object.operator== unless they are instances of
 * int or String, objects implementing Symbol originally created by a symbol
 * literal or a constant invocation of the Symbol constructor, or objects
 * implementing Type originally created by a constant type literal expression.
 * It is a compile-time error if any two of the values are equal according to ==
 *
 * @description Checks that it is a compile-time error if any any two of the
 * values are equal according to ==
 * @author sgrekhov@unipro.ru
 */
main() {
  var v1 = const {1, 2, 1};
  //       ^
  // [cfe] Constant evaluation error:
  //                    ^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
  const v2 = const {1, 2, 1};
  //         ^
  // [cfe] Constant evaluation error:
  //                      ^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
  const v3 = {1, 2, 1};
  //         ^
  // [cfe] Constant evaluation error:
  //                ^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
  var v4 = const {1, null, null};
  //       ^
  // [cfe] Constant evaluation error:
  //                       ^^^^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
  const v5 = const {'a', 'b', 'c', 'a'};
  //         ^
  // [cfe] Constant evaluation error:
  //                               ^^^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
  const v6 = {'a', 'b', 'c', 'a'};
  //         ^
  // [cfe] Constant evaluation error:
  //                         ^^^
  // [analyzer] COMPILE_TIME_ERROR.EQUAL_ELEMENTS_IN_CONST_SET
}