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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Patch: make eldoc indicate current argument
Date: Mon, 16 Jul 2007 23:34:46 -0400
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To: Paul Pogonyshev <pogonyshev@gmx.net>
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In-reply-to: <200707160223.25223.pogonyshev@gmx.net> (message from Paul
	Pogonyshev on Mon, 16 Jul 2007 02:23:24 +0300)
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    I was aware of such things (optional parameters in brackets), but
    didn't figure out what to do with them:

	;; FIXME: What to do with optional arguments, like in
	;;        (defun NAME ARGLIST [DOCSTRING] BODY...) case?
	;;        The problem is there is no robust way to determine if
	;;        the current argument is indeed a docstring.

Doc strings are so important that eldoc may as well have special-case
code for them.