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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: backup method
Date: Thu, 03 Feb 2005 01:40:16 -0500
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    Any reason why you didn't use make-temp-file?

make-temp-file creates the file empty.  Between that and writing the
data into it, someone else could delete the file and put in a symlink.
The code I wrote solves that problem.