tests/language/identity/closure2_test.dart

// Copyright (c) 2012, 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.

import "package:expect/expect.dart";
import 'package:expect/variations.dart' as v;

var myIdentical = identical;

main() {
  // Mint (2^63).
  Expect.isTrue(myIdentical(0x8000000000000000, 0x8000000000000000));

  if (!v.jsNumbers) {
    Expect.isFalse(myIdentical(0x8000000000000000, 0x8000000000000000 + 1));

    // Different types.
    Expect.isFalse(myIdentical(42, 42.0));

    // NaN handling.
    Expect.isTrue(myIdentical(double.nan, double.nan));
  } else {
    // Web numbers have less precision, conflate int and double values, and have
    // an incorrect implementation of `identical` for NaNs.
    Expect.isTrue(myIdentical(0x8000000000000000, 0x8000000000000000 + 1));
    Expect.isTrue(myIdentical(42, 42.0));
    Expect.isFalse(myIdentical(double.nan, double.nan));
  }
}