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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: vc-diff in non-VC buffer
Date: Thu, 11 Oct 2007 01:20:26 -0400
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    C:\> emacs -Q -D
    C-x v =

    => launches a traversal of the hard disk.

I think it should verify that the current buffer corresponds to a
version-controlled directory or file.  Eric, do you see any
argument against doing so?