GNU Emacs has two debuggers, debug and edebug. The
first is built into the internals of Emacs and is always with you;
the second is an extension to Emacs that has become part of the standard
distribution in version 19.
Both debuggers are described extensively in section `Debugging Lisp Programs' in The GNU Emacs Lisp Reference Manual. In this chapter, I will walk through a short example of each.
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