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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: patch for woman (woman-topic-at-point)
Date: Sat, 27 Aug 2005 22:45:19 -0400
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References: <38wtm926pt.fsf@tiscali.de> <E1E8cvW-0003zN-N8@fencepost.gnu.org>
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Cc: Dr Francis J Wright <F.J.Wright@qmul.ac.uk>, emacs-devel@gnu.org
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Xref: news.gmane.org gmane.emacs.devel:42455
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    It follows from the above that if you want to offer some suggestion using
    the argument DEF of `completing-read' the suggestion must be "valid".

Ok, so test it for validity and provide it as a default only if it
is valid.

I see that's what your latest patch does.  I have not checked it line
by line, but it looks like the right overall.  Francis, do you agree?