LanguageFeatures/Control-flow-collections/const_collections_A06_t01.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.

// @dart = 2.9

/// @assertion An if element:
/// ...
/// It is a compile-time error if the condition evaluates to false and the else
/// expression, if it exists, is not a constant expression.
///
/// @description Checks that it is a compile-time error if the condition
/// evaluates to false and the else expression is not a constant expression.
/// @author ngl@unipro.ru

main() {
  const t = false;
  var x = 1;
  List<int> list1 = const [if (t) 1 else x];        //# 01: compile-time error
  const List<int> list2 = [if (t) 2 else x + 1];    //# 02: compile-time error
  var list3 = const [if (t) 3 else x - 1];          //# 03: compile-time error
  var list4 = const <int>[if (t) 4 else x - 2];     //# 04: compile-time error
  const list5 = [if (t) 5 else x + 2];              //# 05: compile-time error

  Set<int> set1 = const {if (t) 1 else x};          //# 06: compile-time error
  const Set<int> set2 = {if (t) 2 else x - 1};      //# 07: compile-time error
  var set3 = const {if (t) 3 else x + 1};           //# 08: compile-time error
  var set4 = const <int>{if (t) 4 else x + 2};      //# 09: compile-time error
  const set5 = {if (t) 5 else x - 2};               //# 10: compile-time error

  Map<int, String> map1 = const {if (t) 1: "1x" else x: "x"};         //# 11: compile-time error
  const Map<int, String> map2 = {if (t) 2: "2x" else x - 1: "x-1"};   //# 12: compile-time error
  var map3 = const {if (t) 3: "3x" else x + 1: "x+1"};                //# 13: compile-time error
  var map4 = const <int, String>{if (t) 4: "4x" else x - 2: "x-2"};   //# 14: compile-time error
  const map5 = {if (t) 5: "5x" else x + 2: "x+2"};                    //# 15: compile-time error
}