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From: Richard M Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Idea for syntax-ppss.  Is it new?  Could it be any good?
Date: Sun, 27 Jul 2008 22:27:06 -0400
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To: Alan Mackenzie <acm@muc.de>
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Xref: news.gmane.org gmane.emacs.devel:101614
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    It caches the state for several positions, but I don't think they're at
    regular positions.  I don't understand the detailed workings of the
    routine at the moment.

If we have a cache, it might be more efficient to cache the locations
where beginnings of defuns were found.