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(emacs-lisp-intro.info)Debugging

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Debugging
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   GNU Emacs has two debuggers, `debug' and `edebug'.  The first is
built into the internals of Emacs and is always with you; the second
requires that you instrument a function before you can use it.

   Both debuggers are described extensively in Note: Debugging Lisp
Programs.  In this chapter, I will walk through a
short example of each.

debug

How to use the built-in debugger.

debug-on-entry

Start debugging when you call a function.

debug-on-quit

Start debugging when you quit with C-g.

edebug

How to use Edebug, a source level debugger.

Debugging Exercises