Classyフレームワークの次の行を理解できません。
/* 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') > 0;
function usesSuper(obj) {
return !probe_super || /\B\$super\b/.test(obj.toString());
}
いつ、どのようにして probe_super が false を返すようにしますか?