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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Problem report #60
Date: Wed, 12 Apr 2006 13:10:30 -0400
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    So this is fine.  It'd be a big bug if t were 0, though, indexing at -1
    like that.  Looking back up, it seems that if the while loop iterates even
    once, t is > 0, but what if the while test fails the first time?

Which while test is that?  Which line number?