JSTests/test262/test/language/arguments-object/mapped/mapped-arguments-nonconfigurable-nonwritable-1.js

// Copyright (C) 2015 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
info: Mapped arguments object with non-configurable property
description: >
    Mapped arguments property is changed to non-configurable and
    non-writable. Perform property attribute changes with a single
    [[DefineOwnProperty]] call. Mapped values are unchanged, mapping
    itself is removed.
flags: [noStrict]
---*/

function argumentsNonConfigurableAndNonWritable(a) {
  Object.defineProperty(arguments, "0", {configurable: false, writable: false});
  assert.sameValue(a, 1);
  assert.sameValue(arguments[0], 1);

  // Postcondition: Arguments mapping is removed.
  a = 2;
  assert.sameValue(a, 2);
  assert.sameValue(arguments[0], 1);
}
argumentsNonConfigurableAndNonWritable(1);