GNU bug report logs - #38912
27.0.60; PDumper meets segmentation fault when evil is loaded

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Message #58 received at 38912 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: dancol <at> dancol.org
Cc: niwtrx <at> icloud.com, Paul Eggert <eggert <at> cs.ucla.edu>, emacs-devel <at> gnu.org,
 38912 <at> debbugs.gnu.org, Pip Cet <pipcet <at> gmail.com>,
 Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#38912: 27.0.60; PDumper meets segmentation fault when evil
 is loaded
Date: Tue, 07 Jan 2020 09:16:31 -0500

>  The worst case is window configurations, where there's a nontrivial 
>  function compare_window_configurations that Fequal delegates to.

Indeed, this is very strange.

>  Does anyone know offhand why we don't simply use eq to compare window 
>  configurations?

I'm curious about it too.  As a long-time Elisp coder, I find this
behavior very odd (I just discovered it while looking at the code)
and I think having them compared by identity would make a lot more sense.

> I think changing the equal behavior of these objects would be
> a compatibility change.

Indeed.  It's clearly out of the question for Emacs-27.  But I'd be in
favor of introducing this backward incompatibility in Emacs-28, unless
we can find a good use case where the structural-equality is needed
for them.


        Stefan

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