GNU bug report logs - #19324
25.0.50; add-function and nil

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Package: emacs;

Reported by: Leo Liu <sdl.web <at> gmail.com>

Date: Tue, 9 Dec 2014 04:56:02 UTC

Severity: normal

Found in version 25.0.50

Done: Leo Liu <sdl.web <at> gmail.com>

Bug is archived. No further changes may be made.

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Message #11 received at 19324 <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 19324 <at> debbugs.gnu.org
Subject: Re: bug#19324: 25.0.50; add-function and nil
Date: Thu, 11 Dec 2014 08:57:33 +0800

On 2014-12-10 14:54 -0500, Stefan Monnier wrote:
> - Make sure all the functions you add use either :override or :around
>   and check that the orig is not nil before calling it.

Yes, I had expected this to work and obviously not so filed this bug.
Otherwise it is not a bad workaround.

Go to a buffer in text mode where the default
eldoc-documentation-function is nil and eval

  (add-function :around (local 'eldoc-documentation-function)
                        (lambda (orig) (or (and orig (funcall orig)) (ignore))))

Move around to get the error.

Leo
This bug report was last modified 10 years and 168 days ago.

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