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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Subtle bugs in interval code.
Date: Fri, 23 Mar 2007 18:32:34 -0400
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Xref: news.gmane.org gmane.emacs.devel:68435
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    Studying the code in interval.c for merge_properties and
    intervals_equal, I noticed that they use Fmemq to search
    for a given property on a plist.

This is a simple thing, so how about writing an explicit loop in those
two places, which does exactly the right thing?  No need to make it a
subroutine.

It probably should not do QUIT;.