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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: opening /tmp//foo doesn't work.
Date: Sat, 12 Nov 2005 16:21:59 -0500
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    So I would like to suggest that if opening /foo fails emacs will
    s|//|/|g and then try to open /tmp/foo, and if that fails will
    report that /foo and /tmp/foo do not exist.

It won't work, because `/tmp/' is deleted in the minibuffer
before Emacs ever tries to open a file.

That is a very important feature, and must be enabled by default.
However, it could make sense to turn off this feature when
insert-default-directory is nil.  Do people think that is a good idea?