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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs crashes
Date: Thu, 16 Mar 2006 15:18:24 -0500
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    So we know that the code that clobbers can store -1.  That may be useful.
    Is it always -1?

I see I was mistaken in reaching that conclusion, since it wasn't
a real cons cell.