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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: grep-mode should print default-directory (again)
Date: Thu, 12 Apr 2007 21:42:55 -0400
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To: Nick Roberts <nickrob@snap.net.nz>
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In-reply-to: <17946.53750.886235.857427@farnswood.snap.net.nz> (message from
	Nick Roberts on Tue, 10 Apr 2007 11:53:26 +1200)
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Xref: news.gmane.org gmane.emacs.devel:69367
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    AFAICS compilation-directory is just used with recompile and it gets set by
    M-x compile (through default-directory).

Damn, you're right.  That means the change to set compilation-directory
instead of default-directory was no good.  It broke the feature.

I can see only two ways to fix this:

* Go back to setting and saving default-directory, as before, and mark
  it safe.  (I don't find the arguments against this entirely convincing.)

* Make compilation-directory affect next-error, overriding
  default-directory.