GNU bug report logs - #39682
describe-package disabled by help-fns+.elc compiled in older Emacs

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Message #51 received at 39682 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 39682 <at> debbugs.gnu.org, Tim Johnson <tim <at> tj49.com>
Subject: Re: bug#39682: 26.3; Help window for list-packages disabled
Date: Thu, 20 Feb 2020 20:25:13 -0500

retitle 39682 describe-package disabled by help-fns+.elc compiled in older Emacs
tags 39682 = notabug
close 39682
quit

Drew Adams <drew.adams <at> oracle.com> writes:

>> Possible solution!
>> 
>> I loaded emacs -q, ran list-packages, look at the info for help-fns+.el
>> and understood that it would need to be re-compiled with a newer version
>> of emacs.
>> 
>> I just re-compiled help-fns+.el as per instructions in the info file and
>> the problem is solved.
>
> I'm glad you seem to have solved the problem.
>
> But I don't understand how you got help-fns+.el[c] loaded if you
> started Emacs using `emacs -q', which doesn't load your init file.
>
> The original problem really needs to have been narrowed down to only
> the library (or libraries) really necessary to repro the problem.

Yeah, help-fns+ wasn't even mentioned until now, so this was all a bit
surprising.  However, looking at its code I think it's clear what the
problem was: help-fns+ has a copy of the describe-package function,
which it overrides the builtin one with.  The describe-package code
contains a call to package-desc-p which is an inline function.  So a
help-fns+.elc produced by an older version of Emacs uses an older
version of package-desc-p that gives the wrong answer when handed a
new-style struct (i.e., a record rather than a vector).  That's why it
decides that it's been handed something that doesn't specify a package
and complains.

Anyway, I don't think there's anything to fix here, so I'm closing the
report.

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