GNU bug report logs - #4560
23.1.50; (string-match "string" nil) error when typing `M-x help RET'

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From: Giorgos Keramidas <keramida <at> ceid.upatras.gr>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 4560 <at> debbugs.gnu.org, emacs-pretest-bug <at> gnu.org
Subject: bug#4560: 23.1.50; (string-match "string" nil) error when typing `M-x help RET'
Date: Sun, 27 Sep 2009 05:17:57 +0300

On Sat, 26 Sep 2009 20:28:08 -0400, Stefan Monnier <monnier <at> iro.umontreal.ca> wrote:
>> Something seems to have changed in the way string-match works with its
>> second argument is nil.
>
> Actually, the problem was in help.el's use of make-help-screen.
> I've installed the patch below, which should fix it,

> --- lisp/help.el	14 Sep 2009 23:28:43 -0000	1.348
> +++ lisp/help.el	27 Sep 2009 00:27:00 -0000
> @@ -203,7 +203,9 @@
>  ;; It can't find this, but nobody will look.
>  (make-help-screen help-for-help-internal
>    (purecopy "Type a help option: [abcCdefFgiIkKlLmnprstvw.] C-[cdefmnoptw] or ?")
> -  (purecopy
> +  ;; Don't purecopy this one, because it's not evaluated (it's
> +  ;; directly used as a docstring in a function definition, so it'll
> +  ;; be moved to the DOC file anyway: no need for purecopying it).
>    "You have typed %THIS-KEY%, the help character.  Type a Help option:
>  \(Use SPC or DEL to scroll through this text.  Type \\<help-map>\\[help-quit] to exit the Help command.)
>
> @@ -248,7 +250,7 @@
>  C-o         Emacs ordering and distribution information.
>  C-p         Info about known Emacs problems.
>  C-t         Emacs TODO list.
> -C-w         Information on absence of warranty for GNU Emacs.")
> +C-w         Information on absence of warranty for GNU Emacs."
>    help-map)

Thanks!  This seems to have fixed the bug :-)

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