From: Lars Magne Ingebrigtsen <lmi@gnus.org>
To: Xue Fuqiao <xfq.free@gmail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: About Circular Objects
Date: Tue, 25 Dec 2012 15:48:41 +0100 [thread overview]
Message-ID: <87pq1y9ohi.fsf@gnus.org> (raw)
In-Reply-To: <mailman.16090.1356446630.855.help-gnu-emacs@gnu.org> (Xue Fuqiao's message of "Tue, 25 Dec 2012 16:52:49 +0800")
Xue Fuqiao <xfq.free@gmail.com> writes:
> I have a question about the #N# read syntax and #N= syntax. Look at
> this code:
>
> (progn
> (setq x '#1=(a #1#))
> (eq x (cdr x)))
>
> Why does this code return nil? Isn't the second element the list itself?
(progn
(setq x '#1=(a . #1#))
(eq x (cdr x)))
=> t
--
(domestic pets only, the antidote for overdose, milk.)
http://lars.ingebrigtsen.no * Lars Magne Ingebrigtsen
next parent reply other threads:[~2012-12-25 14:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.16090.1356446630.855.help-gnu-emacs@gnu.org>
2012-12-25 14:48 ` Lars Magne Ingebrigtsen [this message]
2012-12-25 14:51 ` About Circular Objects Pascal J. Bourguignon
2012-12-25 8:52 Xue Fuqiao
2012-12-25 14:52 ` Teemu Likonen
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