GNU bug report logs - #36066
27.0.50; Error for C-h f in help-fns--first-release

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Subject: bug#36066: closed (Re: bug#36066: 27.0.50; Error for C-h f in
 help-fns--first-release)
Date: Mon, 03 Jun 2019 02:34:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#36066: 27.0.50; Error for C-h f in help-fns--first-release

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 36066 <at> debbugs.gnu.org.

-- 
36066: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36066
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 36066-done <at> debbugs.gnu.org
Subject: Re: bug#36066: 27.0.50; Error for C-h f in help-fns--first-release
Date: Mon, 03 Jun 2019 04:33:18 +0200

Eric Abrahamsen <eric <at> ericabrahamsen.net> writes:

> Is it possible Juanma Barranquero fixed this like a couple of hours
> ago, in 33ea72eb3c27f5ee5d76980d70ab335d7fa33db6?

Exactly that - nice timing ;-)

Ok, closing.


Thanks,

Michael.

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Error for C-h f in help-fns--first-release
Date: Mon, 03 Jun 2019 04:09:40 +0200

Hello,

for some functions I can't show *Help* with C-h f because I get an error
like this:

Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  add-text-properties(nil nil (button (t) category #:help-news-button help-args nil) nil)
  make-text-button(nil nil type help-news help-args nil)
  help-fns--first-release(my-edebug-setup-hook-fun)
  help-fns--mention-first-release(my-edebug-setup-hook-fun)
  run-hook-with-args(help-fns--mention-first-release my-edebug-setup-hook-fun)
  describe-function-1(my-edebug-setup-hook-fun)
  describe-function(my-edebug-setup-hook-fun)

Seems the variable "first" is never set and ends up nil, thus the error.
It often happens to functions in my init file FWIW.

BTW, the calculation/heuristic also seems not very clever in some cases.
E.g. in emacs -Q I define

(defun f () nil)

C-h f f

    f is a Lisp closure.

    (f)

      Probably introduced at or before Emacs version 1.6.

(defun test () nil)

C-h f test

    test is a Lisp closure.

    (test)

      Probably introduced at or before Emacs version 15.

Etc.  Shouldn't it be obvious to Emacs that I defined the functions?


TIA,

Michael

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