how to get id of function passed into addEventListener

I need to get some identifier for the function being passing to addEventListener to try to find where a bogus second handler is getting added to a library I am using.

using this in a wrapper function around EventDispatcher.addEventListener

override function addEventListener (type:String, listener:Function, useCapture:Boolean=false, priority:int=0, useWeakReference:Boolean=false) : void;

if ( "mouseDown" == type)

     trace( addEventListener type: " + type + " listener: " + listener )

I see in my logs

addEventListener type: mouseDown  listener: function Function() {}

which is not much good.

In the debugger I see an id associated with the function, how can I get that id? or some unique identifier.

Like this

EventCollector.addEventListener: mouseDown  func: 23449322

or ideally

EventCollector.addEventListener: mouseDown  func: className.functionName.instanceId

bob