ActionScript 3.0 :: Flash Check For Specific Event Listener Function?

i'm trying to check if a movieclip has an event listener with a sepecific function bound to it. The hasEventListener function only accepts one parameter (the listener). What i would need would be an hasEventListener that accepts a second parameter, namely the function that is bound to it.

Code:
if (!mc.hasEventListener(MouseEvent.ROLL_OVER) {
mc.addEventListener(MouseEvent.ROLL_OVER, overHandler);
}

but what i would need is:

Code:
if (!mc.hasEventListener(MouseEvent.ROLL_OVER, overHandler) {
mc.addEventListener(MouseEvent.ROLL_OVER, overHandler);
}

because i bind more than one ROLL_OVER listeners to that mc.