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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Undocumented hyperlinks in doc strings.
Date: Fri, 17 Oct 2003 16:46:24 -0400
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    `button' being a text property, we can not just avoid to use it in
    documentation strings.  What about replacing:

			  ((boundp sym)
			   (help-xref-button 8 'help-variable sym))

    by:

			  ((and (boundp sym)
				(not (string= sym "button")))
			   (help-xref-button 8 'help-variable sym))

Perhaps it should test that the variable has documentation
as a variable.  That would be cleaner.  Would that do the job?