text: /// Copyright (c) 2012 Ecma International.  All rights reserved. 
  /**
   * @path ch15/15.4/15.4.4/15.4.4.20/15.4.4.20-9-b-13.js
   * @description Array.prototype.filter - deleting own property with prototype property causes prototype index property to be visited on an Array
   */
  
  
  function testcase() {
          function callbackfn(val, idx, obj) {
              return val < 3 ? true : false;
          }
          var arr = [0, 111, 2];
  
          Object.defineProperty(arr, "0", {
              get: function () {
                  delete arr[1];
                  return 0;
              },
              configurable: true
          });
  
          try {
              Array.prototype[1] = 1;
              var newArr = arr.filter(callbackfn);
  
              return newArr.length === 3 && newArr[1] === 1;
          } finally {
              delete Array.prototype[1];
          }
      }
  runTestCase(testcase);
  