From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: macroexpand and progn Date: Sun, 28 Sep 2014 12:32:42 -0400 Message-ID: References: <87r3ywt3t6.fsf@ferrier.me.uk> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1411922008 32489 80.91.229.3 (28 Sep 2014 16:33:28 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 28 Sep 2014 16:33:28 +0000 (UTC) Cc: emacs-devel@gnu.org To: Nic Ferrier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun Sep 28 18:33:17 2014 Return-path: Envelope-to: ged-emacs-devel@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 1XYHPR-0003Gj-7j for ged-emacs-devel@m.gmane.org; Sun, 28 Sep 2014 18:33:17 +0200 Original-Received: from localhost ([::1]:60318 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XYHPQ-0004kd-P1 for ged-emacs-devel@m.gmane.org; Sun, 28 Sep 2014 12:33:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39281) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XYHP7-0004kQ-EJ for emacs-devel@gnu.org; Sun, 28 Sep 2014 12:33:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XYHOz-0002oe-VY for emacs-devel@gnu.org; Sun, 28 Sep 2014 12:32:57 -0400 Original-Received: from chene.dit.umontreal.ca ([132.204.246.20]:34866) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XYHOz-0002oC-Qn for emacs-devel@gnu.org; Sun, 28 Sep 2014 12:32:49 -0400 Original-Received: from fmsmemgm.homelinux.net (lechon.iro.umontreal.ca [132.204.27.242]) by chene.dit.umontreal.ca (8.14.1/8.14.1) with ESMTP id s8SGWe5N008439; Sun, 28 Sep 2014 12:32:41 -0400 Original-Received: by fmsmemgm.homelinux.net (Postfix, from userid 20848) id 34B55AE80E; Sun, 28 Sep 2014 12:32:42 -0400 (EDT) In-Reply-To: <87r3ywt3t6.fsf@ferrier.me.uk> (Nic Ferrier's message of "Sun, 28 Sep 2014 11:52:37 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV5078=0 X-NAI-Spam-Version: 2.3.0.9378 : core <5078> : inlines <1340> : streams <1302287> : uri <1819205> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 132.204.246.20 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:174778 Archived-At: > In other words it looks like it's not possible to macro define `progn'. Quite likely, indeed. I'd expect trouble when trying to define macros for any of the special forms. > Does anyone know if this is so and if so why? Because they're called *special*-forms? ;-) To make it work reliably, you'd probably need hygienic macros or packages. Stefan