From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Predicate for true lists Date: Sat, 07 Jul 2018 09:54:42 +0300 Message-ID: <8336wvleml.fsf@gnu.org> 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> > <<83601sl0wo.fsf@gnu.org>> <95fda70b-5893-4788-83c5-a0bb5d708304@default> NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1530946397 14683 195.159.176.226 (7 Jul 2018 06:53:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 7 Jul 2018 06:53:17 +0000 (UTC) Cc: contovob@tcd.ie, eggert@cs.ucla.edu, emacs-devel@gnu.org To: Drew Adams Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Jul 07 08:53:13 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 1fbh5k-0003jm-O3 for ged-emacs-devel@m.gmane.org; Sat, 07 Jul 2018 08:53:12 +0200 Original-Received: from localhost ([::1]:60784 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbh7r-0005gO-On for ged-emacs-devel@m.gmane.org; Sat, 07 Jul 2018 02:55:23 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37528) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbh79-0005a8-H1 for emacs-devel@gnu.org; Sat, 07 Jul 2018 02:54:40 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fbh78-0005k5-Kc for emacs-devel@gnu.org; Sat, 07 Jul 2018 02:54:39 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:48958) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbh78-0005k1-H1; Sat, 07 Jul 2018 02:54:38 -0400 Original-Received: from [176.228.60.248] (port=3695 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1fbh77-0004rr-Rx; Sat, 07 Jul 2018 02:54:38 -0400 In-reply-to: <95fda70b-5893-4788-83c5-a0bb5d708304@default> (message from Drew Adams on Fri, 6 Jul 2018 11:00:43 -0700 (PDT)) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e 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:227033 Archived-At: > Date: Fri, 6 Jul 2018 11:00:43 -0700 (PDT) > From: Drew Adams > Cc: contovob@tcd.ie, eggert@cs.ucla.edu, emacs-devel@gnu.org > > > > IIRC, the main motivation for adding this function was > > > to provide a predicate for testing properness. > > > > Then I'd prefer calling the function proper-list-p (and returning the > > list length when it's a proper list) than the other way around. > > Then discoverability of the use for length is reduced. Not if we state in the doc string that the value returned for proper lists is the list length.