GNU bug report logs - #39529
28.0.50; Metahelp does not contain help text

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Federico Tedin <federicotedin <at> gmail.com>
Subject: bug#39529: closed (Re: bug#39529: 28.0.50; Metahelp does not
 contain help text)
Date: Sat, 15 Feb 2020 23:26:02 +0000

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Your bug report

#39529: 28.0.50; Metahelp does not contain help text

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 39529 <at> debbugs.gnu.org.

-- 
39529: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=39529
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 39529-done <at> debbugs.gnu.org, federicotedin <at> gmail.com
Subject: Re: bug#39529: 28.0.50; Metahelp does not contain help text
Date: Sat, 15 Feb 2020 15:25:44 -0800

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On 2/9/20 11:34 AM, Eli Zaretskii wrote:

> I suspect the sxhash changes on Jan 7.  This problem started happening
> in that day's build.

Right you are. The problem was Emacs was using a hash table to unify identical 
Lisp compiled objects when purecopying them, even though their doc strings were 
not set up yet (and so were 0 placeholders that always compared equal). Formerly 
this bug was masked because sxhash simply returned the objects' hashed 
addresses, but the January 7 changes unveiled the bug. I install the attached 
patch to fix the problem.

[0001-Fix-C-h-C-h-bug-due-to-mutating-a-hash-key.patch (text/x-patch, attachment)]

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From: Federico Tedin <federicotedin <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Metahelp does not contain help text
Date: Sun, 09 Feb 2020 20:06:40 +0100

On Emacs 28.0.50 (5e7bead8ea), typing C-h C-h will display the
*Metahelp* buffer, but instead of containing the usual help information,
it will contain just the following:

Automatically break line at a previous space, in insertion of text.

(which appears to be the document string for `auto-fill-function' in
simple.el).

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