From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: Predicate for true lists Date: Fri, 6 Jul 2018 11:04:55 -0700 Organization: UCLA Computer Science Department Message-ID: <6fc589d1-2c21-3e9b-be47-b7700f61642d@cs.ucla.edu> References: <87fu3vdjjk.fsf@tcd.ie> <87bmcqhhsf.fsf@tcd.ie> <87in6xgtpb.fsf@tcd.ie> <2af892df-26cb-60b2-4fd8-067fcb3d32e9@cs.ucla.edu> <87r2kh9uwx.fsf@tcd.ie> <83h8lcnbxb.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------130C5F516105A40884E4BCD6" X-Trace: blaine.gmane.org 1530900191 14035 195.159.176.226 (6 Jul 2018 18:03:11 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 6 Jul 2018 18:03:11 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Cc: emacs-devel@gnu.org To: Eli Zaretskii , "Basil L. Contovounesios" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Jul 06 20:03:07 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fbV4U-0003Vr-Pt for ged-emacs-devel@m.gmane.org; Fri, 06 Jul 2018 20:03:07 +0200 Original-Received: from localhost ([::1]:59201 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbV6a-0003BG-E6 for ged-emacs-devel@m.gmane.org; Fri, 06 Jul 2018 14:05:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:60180) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbV6O-000374-T6 for emacs-devel@gnu.org; Fri, 06 Jul 2018 14:05:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fbV6N-0001oT-Ps for emacs-devel@gnu.org; Fri, 06 Jul 2018 14:05:04 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:38450) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fbV6K-0001jX-0d; Fri, 06 Jul 2018 14:05:00 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 87DAC16113B; Fri, 6 Jul 2018 11:04:58 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 3391mv0lDPhb; Fri, 6 Jul 2018 11:04:56 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id BAFE1161145; Fri, 6 Jul 2018 11:04:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id sK4SdxSFAd-V; Fri, 6 Jul 2018 11:04:56 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 60D83161130; Fri, 6 Jul 2018 11:04:56 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: <83h8lcnbxb.fsf@gnu.org> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:227018 Archived-At: This is a multi-part message in MIME format. --------------130C5F516105A40884E4BCD6 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Eli Zaretskii wrote: > Do we really want this usage of the function as a predicate? I find > this slightly unnatural, Me too, but we haven't come up with a better function semantics, so let's= just=20 live with them. I don't care whether the function is called proper-list-l= ength=20 or proper-list-p. (As Drew mentioned, we could have both names.) > and also not future-proof enough, because you > rely on the checks 'length' does internally. I see now that those checks of 'length' were documented incorrectly, so I= =20 installed the attached documentation fix into the emacs-26 branch. It sho= uld be=20 OK to rely on these checks (after all, they're documented correctly now := -). --------------130C5F516105A40884E4BCD6 Content-Type: text/x-patch; name="0001-Fix-length-CIRCULAR-documentation.patch" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="0001-Fix-length-CIRCULAR-documentation.patch" =46rom 10af9890240d45048cf4553aa731acdb32f7251a Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Fri, 6 Jul 2018 10:59:53 -0700 Subject: [PATCH] Fix (length CIRCULAR) documentation * doc/lispref/sequences.texi (Sequence Functions): Correct documentation of what (length X) does when X is a circular list. --- doc/lispref/sequences.texi | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/doc/lispref/sequences.texi b/doc/lispref/sequences.texi index 76a4a46..59faf2b 100644 --- a/doc/lispref/sequences.texi +++ b/doc/lispref/sequences.texi @@ -75,9 +75,9 @@ Sequence Functions @anchor{Definition of length} This function returns the number of elements in @var{sequence}. If @var{sequence} is a dotted list, a @code{wrong-type-argument} error is -signaled. Circular lists may cause an infinite loop. For a -char-table, the value returned is always one more than the maximum -Emacs character code. +signaled; if it is a circular list, a @code{circular-list} error is +signaled. For a char-table, the value returned is always one more +than the maximum Emacs character code. =20 @xref{Definition of safe-length}, for the related function @code{safe-le= ngth}. =20 --=20 2.7.4 --------------130C5F516105A40884E4BCD6--