$super probe in Classy javascript framework
<p>I can not understand the following lines in <a href="http://classy.pocoo.org" rel="nofollow">Classy</a> framework:</p>

<pre><code>/* we check if $super is in use by a class if we can.  But first we have to
 check if the JavaScript interpreter supports that.  This also matches
 to false positives later, but that does not do any harm besides slightly
 slowing calls down. */
  var probe_super = (function(){$super();}).toString().indexOf('$super') &gt; 0;
  function usesSuper(obj) {
    return !probe_super || /\B\$super\b/.test(obj.toString());
  }
</code></pre>

<p>when and how to make the probe_super return false?    </p>
