GNU bug report logs - #16744
24.3.50; REGRESSION: C-h v does not show doc for `ediff-highlight-all-diffs'

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Message #8 received at 16744 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>, Michael Kifer <kifer <at> cs.stonybrook.edu>
Cc: 16744 <at> debbugs.gnu.org
Subject: Re: bug#16744: 24.3.50;
 REGRESSION: C-h v does not show doc for `ediff-highlight-all-diffs'
Date: Thu, 13 Feb 2014 22:29:34 +0200

> Date: Thu, 13 Feb 2014 11:31:58 -0800 (PST)
> From: Drew Adams <drew.adams <at> oracle.com>
> 
> emacs -Q
> M-x load-library ediff
> C-h v ediff-highlight-all-diffs
> 
> No doc shown, just an empty "Documentation:".

That's because of the ediff-defvar-local macro:

  (defcustom ediff-highlight-all-diffs t
    "If nil, only the selected differences are highlighted.
  Otherwise, all difference regions are highlighted, but the selected region is
  shown in brighter colors."
    :type 'boolean
    :group 'ediff-highlighting)
  (ediff-defvar-local ediff-highlight-all-diffs t "")

It is invoked (here and elsewhere) with an empty string as the doc, so
that's what you get.

Michael, what's the purpose here?

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