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

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Package: emacs;

Reported by: Federico Tedin <federicotedin <at> gmail.com>

Date: Sun, 9 Feb 2020 19:07:01 UTC

Severity: normal

Found in version 28.0.50

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

Full log

Message #16 received at 39529-done <at> debbugs.gnu.org (full text, mbox):

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

[Message part 1 (text/plain, inline)]
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)]
This bug report was last modified 5 years and 91 days ago.

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