From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: eval-case and toplevel prohibitions Date: Wed, 04 Mar 2009 09:48:32 +0100 Message-ID: <87ab811xnj.fsf@gnu.org> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1236156545 21873 80.91.229.12 (4 Mar 2009 08:49:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 4 Mar 2009 08:49:05 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Wed Mar 04 09:50:22 2009 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1Lemnw-0005To-UM for guile-devel@m.gmane.org; Wed, 04 Mar 2009 09:50:17 +0100 Original-Received: from localhost ([127.0.0.1]:42541 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Lemmc-0005ZP-4H for guile-devel@m.gmane.org; Wed, 04 Mar 2009 03:48:54 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LemmW-0005ZK-VZ for guile-devel@gnu.org; Wed, 04 Mar 2009 03:48:49 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LemmV-0005Z8-IN for guile-devel@gnu.org; Wed, 04 Mar 2009 03:48:48 -0500 Original-Received: from [199.232.76.173] (port=52273 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LemmV-0005Z5-Cy for guile-devel@gnu.org; Wed, 04 Mar 2009 03:48:47 -0500 Original-Received: from main.gmane.org ([80.91.229.2]:41108 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LemmU-0001m5-J1 for guile-devel@gnu.org; Wed, 04 Mar 2009 03:48:46 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LemmP-0004bs-NP for guile-devel@gnu.org; Wed, 04 Mar 2009 08:48:41 +0000 Original-Received: from 193.50.110.227 ([193.50.110.227]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 04 Mar 2009 08:48:41 +0000 Original-Received: from ludo by 193.50.110.227 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 04 Mar 2009 08:48:41 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 21 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 193.50.110.227 X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 14 =?iso-8859-1?Q?Vent=F4se?= an 217 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.90 (gnu/linux) Cancel-Lock: sha1:W0iMxlQx9y57YMTfvT+Jq5YOKfs= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:8219 Archived-At: Hello! Andy Wingo writes: > So I was thinking: why do we have this fetish for prohibiting certain > forms in a non-toplevel context? I am of a mind to replace eval-case > with eval-when, which is actually more expressive, as it allows us to > discriminate the different phases in non-toplevel contexts as well. Could it be because `eval-case' expressions can evaluate to nothing, which can be confusing in non-top-level contexts, e.g., (define (nothing) (let ((foo (eval-case ((never-true) 'foo)))) foo)) Actually, this yields # in Guile-VM and #f in `master'. The definition of `toplevel-env?' in there in quite sloppy... Thanks, Ludo'.