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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: vc-find-root and nonexistent drives
Date: Sun, 17 Feb 2008 06:18:24 +0200
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	<jwvhcg9kmdz.fsf-monnier+emacs@gnu.org>
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Cc: lekktu@gmail.com, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-reply-to: <jwvabm0k5he.fsf-monnier+emacs@gnu.org> (message from Stefan
	Monnier on Sat, 16 Feb 2008 15:33:15 -0500)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sat, 16 Feb 2008 15:33:15 -0500
> Cc: Emacs Devel <emacs-devel@gnu.org>
> 
> Can you try the patch below?

I'd suggest to mention MS-Windows and the specific problem mentioned
by Juanma in the comments.