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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fixing numerous `message' bugs..
Date: Fri, 07 Dec 2007 12:17:58 -0500
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To: David Kastrup <dak@gnu.org>
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In-reply-to: <85abonpxnw.fsf@lola.goethe.zz> (message from David Kastrup on
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Xref: news.gmane.org gmane.emacs.devel:84832
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    +++ b/lisp/textmodes/artist.el
    @@ -1151,14 +1151,14 @@ PREV-OP-ARG are used when invoked recursively during the build-up."
       (interactive)
       (let ((next-op (cdr (cdr (assoc artist-curr-go artist-prev-next-op-alist)))))
	 (artist-select-operation next-op)
    -    (message next-op)))
    +    (message (and next-op "%s") next-op)))

I have a feeling that next-op is always supposed to be non-nil, and I
think artist-select-operation will get en error if next-op is not nil.
So I think the `and' is not needed.  How about asking the `artist.el'
maintainer?