JSTests/test262/test/language/arguments-object/mapped/mapped-arguments-nonconfigurable-strict-delete-2.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: >
    Mapping works when property is non-configurable, arguments property
    was not deleted. [[Delete]] operations throws TypeError if called
    from strict-mode code. Variable is changed with SetMutableBinding.
flags: [noStrict]
---*/

function argumentsAndStrictDeleteSetMutableBinding(a) {
  Object.defineProperty(arguments, "0", {configurable: false});

  // Precondition: Delete is unsuccessful and doesn't affect mapping.
  var args = arguments;
  assert.throws(TypeError, function() { "use strict"; delete args[0]; });
  assert.sameValue(a, 1);
  assert.sameValue(arguments[0], 1);

  a = 2;
  assert.sameValue(a, 2);
  assert.sameValue(arguments[0], 2);
}
argumentsAndStrictDeleteSetMutableBinding(1);