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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Elisp manual: Note that created faces cannot be removed.
Date: Sat, 20 Jul 2019 21:41:20 +0300
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In-reply-to: <83a7d8sg7w.fsf@gnu.org> (message from Eli Zaretskii on Sat, 20
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> Date: Sat, 20 Jul 2019 21:39:31 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> > +Note that once you have defined a face with @code{defface}, you cannot
> > +later remove this face except by restarting Emacs.
> 
> I think without some index entries leading to it, this sentence will
> be lost in the ocean of the information in the manual.

Also, defface is not the only way of defining a face, unlike what the
proposed text seems to imply.