<!DOCTYPE HTML>
<html>
<head>
<script>


function f() {
  for (var j in { a:1, b:2, c:3, d:4, e:5 }) {
  }
}

function boom()
{
  f();
  Function.prototype.__defineGetter__("xxx", function(){});
}

</script></head>

<body onload="boom();"></body>
</html>