GNU bug report logs - #55395
What does (1 2 3 . #2) mean?

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Message #29 received at 55395 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 55395 <at> debbugs.gnu.org, Lars Ingebrigtsen <larsi <at> gnus.org>
Subject: Re: bug#55395: What does (1 2 3 . #2) mean?
Date: Wed, 18 May 2022 17:16:16 -0400

>  [(1 2 3 . #0)]
>
> could mean either
>
>  [#1=(1 2 3 . #1#)]
>
> or
>
>  #1=[(1 2 3 . #1#)]

AFAIK it *should* mean the latter (#0 is the root of the overall
printed object, not just the list).

Mattias Engdegård [2022-05-18 16:29:51] wrote:

> Perhaps these attempts to generate a meaningful circularity reference is
> a fool's errand and we should just go with #!circle! or something similar.

Yup.  But we don't shy away from playing the fools.


        Stefan

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