[asdf-devel] lisp source debugger

Hi, This maybe an irrelevant question, if so, please point me to the best list to ask. But I am wondering whether you guys can recommend some source level debugger that can POINT ME PRECISELY to where the error was. For example, Allegro CL cannot because many times it tells me that there is an error in a function, but it doesn't tell me which line even if I set their debug flag to 3 the highest level and suppressed everything else, speed, optimization etc. (my function has hundreds of lines then I am frustrated ...)

Best, Yuan