text: // Copyright (c) 2012 Ecma International.  All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  esid: sec-array.prototype.reduce
  es5id: 15.4.4.21-8-b-iii-1-20
  description: >
      Array.prototype.reduce - element to be retrieved is own accessor
      property without a get function that overrides an inherited
      accessor property on an Array
  ---*/
  
          var testResult = false;
          function callbackfn(prevVal, curVal, idx, obj) {
              if (idx === 1) {
                  testResult = (prevVal === undefined);
              }
          }
  
              Array.prototype[0] = 0;
              var arr = [, 1, 2];
              Object.defineProperty(arr, "0", {
                  set: function () { },
                  configurable: true
              });
  
              arr.reduce(callbackfn);
  
  assert(testResult, 'testResult !== true');
  