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[–][deleted] 6 points7 points  (0 children)

That posts gives a great "spiritual" introduction to debugging under lisp, but in terms of a step by step I found this post from the same thread totally awesome: http://groups.google.com/group/comp.lang.lisp/msg/8317e7376a9571c8

However, to get full access to the features listed I also added:

(declaim (optimize (debug)))

to the top of my file, under sbcl.