Language/Expressions/If_null_Expressions/syntax_t03.dart

// Copyright (c) 2015, 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
///  ifNullExpression:
///   logicalOrExpression (‘??’ logicalOrExpression)*
///
/// @description Verify several kinds of if-null expressions, logicalOrExpression
/// is an expression.
/// @author a.semenov@unipro.ru

import '../../../Utils/expect.dart';

main() {
  int? x = 1;
  dynamic empty = [];
  Expect.equals(2, ((x as int) + 1) ?? 10);
//                                     ^^
// [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION
//                             ^
// [cfe] Operand of null-aware operation '??' has type 'int' which excludes null.
  Expect.iterableEquals([], empty ?? 10);
  Expect.equals(30, (10 + 5 * 4) ?? (2 + 2 * 2));
//                                  ^^^^^^^^^^^
// [analyzer] STATIC_WARNING.DEAD_NULL_AWARE_EXPRESSION
//                      ^
// [cfe] Operand of null-aware operation '??' has type 'int' which excludes null.
}