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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Strange `file-name-sans-extension' behavior
Date: Sat, 10 Aug 2002 11:16:52 -0600 (MDT)
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    Could we introduce a new function for that or some way to tell
    `expand-file-name' not to do the expansion if the dir is relative ?

In principle this is ok, but why is concat not correct?
In this very limited situation, it ought to be correct as
far as I can tell.