Received: from mx0.gmx.net (mx0.gmx.net [213.165.64.100]) by h1439878.stratoserver.net (8.14.2/8.14.2/Debian-2build1) with SMTP id q0TDbMOn030566 for ; Sun, 29 Jan 2012 14:37:23 +0100 Received: (qmail 1700 invoked by alias); 29 Jan 2012 13:37:17 -0000 Delivered-To: GMX delivery to rainer.schoepf@gmx.net Received: (qmail invoked by alias); 29 Jan 2012 13:37:17 -0000 Received: from relay.uni-heidelberg.de (EHLO relay.uni-heidelberg.de) [129.206.100.212] by mx0.gmx.net (mx060) with SMTP; 29 Jan 2012 14:37:17 +0100 Received: from listserv.uni-heidelberg.de (listserv.uni-heidelberg.de [129.206.100.94]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q0TDZ9NF012184 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 29 Jan 2012 14:35:09 +0100 Received: from listserv.uni-heidelberg.de (localhost.localdomain [127.0.0.1]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id q0T876QV002175; Sun, 29 Jan 2012 14:35:08 +0100 Received: by LISTSERV.UNI-HEIDELBERG.DE (LISTSERV-TCP/IP release 16.0) with spool id 1936009 for LATEX-L@LISTSERV.UNI-HEIDELBERG.DE; Sun, 29 Jan 2012 14:35:08 +0100 Received: from relay2.uni-heidelberg.de (relay2.uni-heidelberg.de [129.206.210.211]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id q0TDZ8Tw018120 for ; Sun, 29 Jan 2012 14:35:08 +0100 Received: from mail-lpp01m010-f49.google.com (mail-lpp01m010-f49.google.com [209.85.215.49]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id q0TDZ4e7014086 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=FAIL) for ; Sun, 29 Jan 2012 14:35:08 +0100 Received: by lagr15 with SMTP id r15so2666986lag.22 for ; Sun, 29 Jan 2012 05:35:04 -0800 (PST) MIME-Version: 1.0 Received: by 10.112.25.33 with SMTP id z1mr3698386lbf.7.1327844104000; Sun, 29 Jan 2012 05:35:04 -0800 (PST) Received: by 10.152.21.39 with HTTP; Sun, 29 Jan 2012 05:35:03 -0800 (PST) References: <4F254990.5050407@morningstar2.co.uk> Content-Type: text/plain; charset=ISO-8859-1 X-Spam-Whitelist: Message-ID: Date: Sun, 29 Jan 2012 08:35:03 -0500 Reply-To: Mailing list for the LaTeX3 project Sender: Mailing list for the LaTeX3 project From: Bruno Le Floch Subject: Re: Unexpandability inside \csname To: LATEX-L@listserv.uni-heidelberg.de In-Reply-To: <4F254990.5050407@morningstar2.co.uk> Precedence: list List-Help: , List-Unsubscribe: List-Subscribe: List-Owner: List-Archive: X-GMX-Antispam: 0 (BackTrace mail analyze); Detail=5D7Q89H36p4L00VTXC6D4q0N+AH0PUCnGL2vqOgpaBYL16oitsMrgDt/NQNpSCZFFjDOy 97xb7Zpf+wZnd5ZXNcvLDXR3Wg3wRjdQbwEMh8=V1; X-Resent-By: Forwarder X-Resent-For: rainer.schoepf@gmx.net X-Resent-To: rainer@rainer-schoepf.de Status: R X-Status: X-Keywords: X-UID: 6998 >> Perhaps you meant >> >> \csname\ifnum 3>2\fi\endcsname >> >> which indeeds does \csname\relax\endcsname, an error. > > We should be fine here in expl3, I think, as internally we have > something like > > \csname\ifnum\numexpr3\relax>\numexpr2\relax\fi\endcsname > > in this scenario, and that is fine. Precisely. If there were stray "implicit \relax", then they would appear in x-expansion as well. Bruno