Language/Expressions/Constants/parenthesized_expression_t01.dart

// Copyright (c) 2011, 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 A constant expression is an expression whose value can never
/// change, and that can be evaluated entirely at compile time.
/// A constant expression is one of the following:
/// . . .
/// • A parenthesized expression (e) where e is a constant expression.
/// @description Checks that a parenthesized constant expression can be an
/// element of a constant list literal and is, therefore, a constant expression.
/// @author msyabro

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

const x = '';
const bool y = false;

class C {
  const C();
}

const constList = const [
  (1),
  (true),
  (''),
  (null),
  (x),
  (y),
  (const C()),
  (const [1, 2, 3]),
  (const {}),
  (1 == 1),
  (identical('', null)),
  (true != false),
  (!true),
  (false && false),
  (1 ^ 2),
  (~0),
  (2 + 0.5),
  (1 * 1)
];

main() {
  Expect.isTrue(constList is List);
  Expect.runtimeIsType<List>(constList);
}