tor-browser

The Tor Browser
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mapped-arguments-nonwritable-nonconfigurable-2.js (950B)

      1 // Copyright (C) 2015 André Bargull. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 info: Mapped arguments object with non-configurable property
      6 description: >
      7    Mapped arguments property is changed to non-writable and
      8    non-configurable. Perform property attribute changes with two
      9    [[DefineOwnProperty]] calls. Add intervening call to
     10    SetMutableBinding.
     11 flags: [noStrict]
     12 ---*/
     13 
     14 function argumentsNonWritableThenNonConfigurableWithInterveningSetMutableBinding(a) {
     15  Object.defineProperty(arguments, "0", {writable: false});
     16  a = 2;
     17  Object.defineProperty(arguments, "0", {configurable: false});
     18  assert.sameValue(a, 2);
     19  assert.sameValue(arguments[0], 1);
     20 
     21  // Postcondition: Arguments mapping is removed.
     22  a = 3;
     23  assert.sameValue(a, 3);
     24  assert.sameValue(arguments[0], 1);
     25 }
     26 argumentsNonWritableThenNonConfigurableWithInterveningSetMutableBinding(1);
     27 
     28 reportCompare(0, 0);