deepForInLoop.js - mozsearch

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function deepForInLoop() {

  // NB: the number of props set in C is arefully tuned to match 8 = 2.

  function C(){this.p = 1, this.q = 2}

  C.prototype = {p:1, q:2, r:3, s:4, t:5};

  var o = new C;

  var j = 0;

  var a = [];

  for (var i in o)

    a[j++] = i;

  return a.join("");

assertEq(deepForInLoop(), "pqrst");