From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=) Newsgroups: gmane.lisp.guile.bugs Subject: bug#17474: Making *unspecified* equivalent to (values) would seem convenient Date: Mon, 12 May 2014 21:21:25 +0200 Message-ID: <87egzyajm2.fsf@gnu.org> References: <87r43zuswp.fsf@fencepost.gnu.org> <8738gfyoxm.fsf@gnu.org> <87iopbue6m.fsf@fencepost.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 1399922548 16568 80.91.229.3 (12 May 2014 19:22:28 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 12 May 2014 19:22:28 +0000 (UTC) Cc: 17474@debbugs.gnu.org To: David Kastrup Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Mon May 12 21:22:21 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 1Wjvnm-0005B0-T8 for guile-bugs@m.gmane.org; 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Mon, 12 May 2014 19:22:02 +0000 Original-Received: (at 17474) by debbugs.gnu.org; 12 May 2014 19:21:31 +0000 Original-Received: from localhost ([127.0.0.1]:32865 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Wjvn1-0006vN-1M for submit@debbugs.gnu.org; Mon, 12 May 2014 15:21:31 -0400 Original-Received: from hera.aquilenet.fr ([141.255.128.1]:48240) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1Wjvmy-0006vD-Ev for 17474@debbugs.gnu.org; Mon, 12 May 2014 15:21:29 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by hera.aquilenet.fr (Postfix) with ESMTP id E791328BA; Mon, 12 May 2014 21:21:26 +0200 (CEST) Original-Received: from hera.aquilenet.fr ([127.0.0.1]) by localhost (hera.aquilenet.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NmaK6YO-lroA; Mon, 12 May 2014 21:21:26 +0200 (CEST) Original-Received: from pluto (reverse-83.fdn.fr [80.67.176.83]) by hera.aquilenet.fr (Postfix) with ESMTPSA id 912DD285D; Mon, 12 May 2014 21:21:26 +0200 (CEST) X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 23 =?UTF-8?Q?Flor=C3=A9al?= an 222 de la =?UTF-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu In-Reply-To: <87iopbue6m.fsf@fencepost.gnu.org> (David Kastrup's message of "Mon, 12 May 2014 18:58:25 +0200") User-Agent: Gnus/5.130009 (Ma Gnus v0.9) 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:7456 Archived-At: David Kastrup skribis: > ludo@gnu.org (Ludovic Court=C3=A8s) writes: > >> R5RS defines =E2=80=98values=E2=80=99 as: >> >> (define (values . things) >> (call-with-current-continuation >> (lambda (cont) (apply cont things)))) >> >> Thus, a conforming implementation must raise a run-time error when the >> continuation of a (values) form expects one or more values. > > No. From R5RS: > > -- procedure: call-with-current-continuation proc > > [...] > > The escape procedure accepts the same number of arguments as the > continuation to the original call to > call-with-current-continuation. Except for continuations created > by the `call-with-values' procedure, all continuations take > exactly one value. The effect of passing no value or more than > one value to continuations that were not created by > call-with-values is unspecified. Oh indeed, I stand corrected. > So this behavior is neither out of line, nor against the standard. It > is merely a more convenient behavior for a situation that the standard > left unspecified. Right. 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. Thanks, Ludo=E2=80=99.