GNU bug report logs - #24875
26.0.50; In Dotted Pair Notation, the read function returns CDR if CAR is absent

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Chunyang Xu <mail <at> xuchunyang.me>
Cc: 24875 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#24875: 26.0.50; In Dotted Pair Notation, the read function returns CDR if CAR is absent
Date: Tue, 06 Jul 2021 17:32:26 +0200

Chunyang Xu <mail <at> xuchunyang.me> writes:

> For example, I eval this in the *scratch* buffer:
>
> (read "( . 123)")
>      ⇒ 123
>
> (read "(1 . ( . (3 . nil)))")
>      ⇒ (1 3)
>
> I can't find explanation about this behavior in elisp manual. Is it
> expected?

That is indeed very eccentric behaviour, so we should probably mention
it somewhere?  (I guess we can't change it.)

Anybody got an opinion here, or a way that we can describe it in the
manual except pointing at the examples and then going ¯\_(ツ)_/¯?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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