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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fight: font-lock.el 1.289 vs. cc-defs.el
Date: Mon, 30 Jan 2006 13:46:04 -0500
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Xref: news.gmane.org gmane.emacs.devel:49773
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    I'm asking that this change to font-lock.el be reconsidered, though I
    admit I don't know the problem it fixes.

It detects a kind of problem that was hard to debug, when it occurred.
I decided we needed to make such problems show themselves.  I don't
remember the details, but there was probably another change around the
same time which fixed the specific problem.

    CC Mode calls (font-lock-compile-keywords "\\<\\>") at initialisation, to
    test for a bug in middle aged XEmacsen which splatted font-lock-keywords.
    The new check in V1.289 causes CC Mode to bail out with an error.

I suggest you test that condition only on XEmacs.