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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Feature request: A way to get a traceback to a buffer or a
	string
Date: Tue, 11 Dec 2007 14:01:13 -0500
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To: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
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Xref: news.gmane.org gmane.emacs.devel:85061
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/85061>

    In some situations you may know that a function call will cause an 
    error. You may then want to get a traceback from this particular call, 
    without user intervention.

Can you explain why this is useful?  I do not see the usefulness.