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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Redefining functions and variables
Date: Thu, 29 Jul 2010 11:57:24 +0200
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> (defmacro defun (name args &rest body)

Just as is the case for `defun', redefining macros with `defmacro'
is problematic.  I really recommend not to do that and use defadvice
instead, which was designed specifically for this purpose.


        Stefan