From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Mark H Weaver Newsgroups: gmane.lisp.guile.bugs Subject: bug#17474: Making *unspecified* equivalent to (values) would seem convenient Date: Sun, 22 Jun 2014 01:25:41 -0400 Message-ID: <87iontwm5m.fsf@yeeloong.lan> References: <87r43zuswp.fsf@fencepost.gnu.org> <8738gfyoxm.fsf@gnu.org> <87iopbue6m.fsf@fencepost.gnu.org> <87egzyajm2.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1403414846 29451 80.91.229.3 (22 Jun 2014 05:27:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 22 Jun 2014 05:27:26 +0000 (UTC) Cc: David Kastrup , 17474@debbugs.gnu.org To: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=) Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Sun Jun 22 07:27:18 2014 Return-path: Envelope-to: guile-bugs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WyaJB-0003XX-0T for guile-bugs@m.gmane.org; Sun, 22 Jun 2014 07:27:17 +0200 Original-Received: from localhost ([::1]:47687 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyaJA-0007PU-Bs for guile-bugs@m.gmane.org; Sun, 22 Jun 2014 01:27:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43403) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyaJ2-0007OT-BJ for bug-guile@gnu.org; Sun, 22 Jun 2014 01:27:14 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WyaIw-0002AY-Fn for bug-guile@gnu.org; Sun, 22 Jun 2014 01:27:08 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:37207) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WyaIw-0002AS-C9 for bug-guile@gnu.org; Sun, 22 Jun 2014 01:27:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1WyaIw-0003lB-09 for bug-guile@gnu.org; Sun, 22 Jun 2014 01:27:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Mark H Weaver Original-Sender: "Debbugs-submit" Resent-CC: bug-guile@gnu.org Resent-Date: Sun, 22 Jun 2014 05:27:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 17474 X-GNU-PR-Package: guile X-GNU-PR-Keywords: Original-Received: via spool by 17474-submit@debbugs.gnu.org id=B17474.140341479714419 (code B ref 17474); Sun, 22 Jun 2014 05:27:01 +0000 Original-Received: (at 17474) by debbugs.gnu.org; 22 Jun 2014 05:26:37 +0000 Original-Received: from localhost ([127.0.0.1]:56590 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WyaIW-0003kV-NS for submit@debbugs.gnu.org; Sun, 22 Jun 2014 01:26:37 -0400 Original-Received: from world.peace.net ([96.39.62.75]:47416 ident=hope2) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1WyaIN-0003kE-Po for 17474@debbugs.gnu.org; Sun, 22 Jun 2014 01:26:34 -0400 Original-Received: from 209-6-91-212.c3-0.smr-ubr1.sbo-smr.ma.cable.rcn.com ([209.6.91.212] helo=yeeloong.lan) by world.peace.net with esmtpsa (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.72) (envelope-from ) id 1WyaIH-0004oV-Ne; Sun, 22 Jun 2014 01:26:21 -0400 In-Reply-To: <87egzyajm2.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Mon, 12 May 2014 21:21:25 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Original-Sender: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.bugs:7508 Archived-At: ludo@gnu.org (Ludovic Court=C3=A8s) writes: > I=E2=80=99m not completely convinced it makes sense to =E2=80=9Cspecify= =E2=80=9D the zero values > case in this way, but I=E2=80=99d like to hear what others think. I'm strongly opposed to having core Guile mechanisms automatically convert between SCM_UNSPECIFIED and zero values, which is part of what David's patch set does. I'd be glad to explain the reasons for my position in a later message, but I don't have time right now. However, I'm (cautiously) open to the idea of changing (if #f x) and some other things to return (values) instead of *unspecified*. I agree that it would be cleaner, though I worry about backward compatibility issues. It would have to be done between major releases. Regards, Mark