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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Lisp debugger problems.
Date: Thu, 03 Mar 2005 15:57:32 -0500
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    What about advising the primitives that define functions to add
    debug-entry-code when a function is in debug-function-list?  Would
    that work?

Please do not think of making any part of Emacs advise primitives.
That technique should never be used, because it causes confusion.  All
code in Emacs that advises other parts of Emacs was installed without
my knowledge.  It is a bug that ought to be fixed.