test/language/arguments-object/mapped/nonconfigurable-descriptors-with-param-assign.js


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// Copyright (C) 2017 Caio Lima. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Property descriptor of mapped arguments object with non-configurable property
info: |
    Mapping keep working when property is set to non-configurable, and its
    descriptor needs to change properly.
flags: [noStrict]
esid: sec-arguments-exotic-objects-defineownproperty-p-desc
includes: [propertyHelper.js]
---*/

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

  a = 2;
  let propertyDescriptor = Object.getOwnPropertyDescriptor(arguments, "0");
  assert.sameValue(propertyDescriptor.value, 2);
  verifyEnumerable(arguments, "0");
  verifyWritable(arguments, "0");
  verifyNotConfigurable(arguments, "0");
}
argumentsAndSetMutableBinding(1);