[Chicken-hackers] [PATCH] Irregex bugfix and update to 0.9.1

[Peter Bex]

Hi all,

Prompted by some discussion and a bogus patch by me, Alex came up with
a very simple but effective fix for ticket #686.  We've made a new
bugfix release for irregex, 0.9.1, so here's a patch to bring Chicken
up-to-date with upstream.

The fix is pretty simple; if you know the regex is a "searcher" (one
that starts with 'bos, ie the beginning of a string), don't loop in
the fold procedure because it can't possibly match anymore.  This should
also improve performance for such regex matches that can be short-cut
like this.

Cheers,
Peter
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0001-Irregex-Ensure-bos-is-matched-only-once-in-irregex-f.patch
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