Language/Expressions/Lists/identical_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.

// @dart = 2.9

/// @assertion Let list1 = const <V>[e11...e1n] and list2 = const <U>[e21...e2n]
/// be two constant list literals and let the  elements of list1 and list2
/// evaluate to  o11... o1n and o21... o2n respectively. Iff identical(o1i, o2i)
/// for 1 <= i <= n and V = U then identical(list1, list2).
/// @description Checks that constant lists with identical elements and type
/// arguments are identical.
/// @author msyabro
/// @reviewer kaigorodov

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

class C {
  const C();
}

main() {
  Expect.isTrue(identical(const [], const []));

  Expect.isTrue(identical(const [1, 2, 1 + 2], const [1, 2, 3]));
  Expect.isTrue(identical(const <bool>[false], const <bool>[false]));
  Expect.isTrue(identical(const ["a", "b", "c"], const ["a", "b", "c"]));
  Expect.isTrue(
      identical(const [1, null, const C()], const [1, null, const C()]));

  var l1 = const [1 + 1, 2 * 2, 3 ~/ 3];
  var l2 = const [2, 4, 1];
  Expect.isTrue(identical(l1, l2));
}