Subject: Re: bug#6664: 24.0.50; Lisp error (void-variable DEFUN) when debugging Elisp code

From: Chong Yidong <[email-masked]>
Date: Sun, 21 Aug 2011 13:44:37 -0400

Christoph <[email-masked]> writes:

> Start Emacs with emacs -Q. Go to grep.el, l.916 in function regrep.
> Set breakpoint with `C-u C-M-x'.  Run `M-x rgrep'.  Press `i' to step
> into the function.  The debugger pops up with the following backtrace:

The error appears because you tried to instrument a built-in function.
I improved the error message to make it more obvious.