Received: from mail.proteosys.com ([213.139.130.197]) by nummer-3.proteosys with Microsoft SMTPSVC(6.0.3790.1830); Wed, 16 Nov 2005 03:41:26 +0100 Received: by mail.proteosys.com (8.12.10/8.12.2) with ESMTP id jAG2fL5g026668 for ; Wed, 16 Nov 2005 03:41:24 +0100 Received: from listserv.uni-heidelberg.de (listserv.uni-heidelberg.de [129.206.100.94]) by relay.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id jAG2aMrp004612 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 16 Nov 2005 03:36:23 +0100 Received: from listserv.uni-heidelberg.de (listserv.uni-heidelberg.de [129.206.100.94]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id jAF3036g028447; Wed, 16 Nov 2005 03:35:43 +0100 Received: by LISTSERV.UNI-HEIDELBERG.DE (LISTSERV-TCP/IP release 14.3) with spool id 845406 for LATEX-L@LISTSERV.UNI-HEIDELBERG.DE; Wed, 16 Nov 2005 03:35:42 +0100 Received: from relay.uni-heidelberg.de (relay.uni-heidelberg.de [129.206.100.212]) by listserv.uni-heidelberg.de (8.13.1/8.13.1) with ESMTP id jAG2ZgWS010688 for ; Wed, 16 Nov 2005 03:35:42 +0100 Received: from dogmatix.mecheng.adelaide.edu.au (dogmatix.mecheng.adelaide.edu.au [129.127.14.1]) by relay.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id jAG2ZUvT004451 for ; Wed, 16 Nov 2005 03:35:38 +0100 Received: (from uucp@localhost) by dogmatix.mecheng.adelaide.edu.au (8.8.7/8.8.7) id NAA32298 for ; Wed, 16 Nov 2005 13:08:32 +1030 Received: from UNKNOWN(129.127.14.10), claiming to be "watt.mecheng.adelaide.edu.au" via SMTP by dogmatix.mecheng.adelaide.edu.au, id smtpdb32294; Wed Nov 16 13:08:27 2005 Received: from WATT/SpoolDir by watt.mecheng.adelaide.edu.au (Mercury 1.44); 16 Nov 05 13:05:19 -9:30 Received: from SpoolDir by WATT (Mercury 1.44); 16 Nov 05 13:05:15 -9:30 Received: from [10.0.1.2] (129.127.14.244) by watt.mecheng.adelaide.edu.au (Mercury 1.44) with ESMTP; 16 Nov 05 13:05:07 -9:30 Mime-Version: 1.0 (Apple Message framework v746.2) References: <88ED1D30-FF25-423D-B73B-485982A3CB69@guerilla.net.au> <5.1.0.14.0.20051110085835.024b6700@pop3.web.de> <20051110100945.GA3265@m0A023274.vpn.uni-freiburg.de> <17267.14888.849329.473348@isostar.informatik.uni-stuttgart.de> Date: Wed, 16 Nov 2005 13:05:05 +1030 Reply-To: Mailing list for the LaTeX3 project Sender: Mailing list for the LaTeX3 project From: Will Robertson Subject: Re: LaTeX3 access, pdfTeX extensions, &c. To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE In-Reply-To: <20051115092311.GB6119@edgard.fdn.fr> Precedence: list X-ProteoSys-SPAM-Score: 0 () X-Scanned-By: MIMEDefang at proteosys.com Return-Path: owner-latex-l@LISTSERV.UNI-HEIDELBERG.DE X-OriginalArrivalTime: 16 Nov 2005 02:41:27.0997 (UTC) FILETIME=[3E67C6D0:01C5EA57] Status: R X-Status: X-Keywords: X-UID: 4899 On 15/11/2005, at 7pm, Benjamin BAYART wrote: > Le Tue, Nov 15, 2005 at 10:51:30AM +1030, Will Robertson: >> >> So we get ... (other "1") (cseq "\previouslet") (cseq "\test") >> and end up with the equivalent of \let\test=1 . >> >> Ohhh, but I think I get it now. This is no more useful than actually >> looking at nodes, since anything that survives to be \previouslet >> will be turned into a node anyway. > > Yes. It's more clearly seen with: > > \hbox{a}\previouslet\test > > What is \test? The right brace? The box? The box is not a token any > more. So we have to keep on that: > - look ahead for tokens > - look backward for nodes. Yes, it is [or would be] the right brace. That is the previous token, before what came prior to \previouslet triggered the building of a node. I'm not saying this would be a particularly useful feature at this point :) I've been convinced that \previouslet isn't useful, but not that it isn't possible; but who wants possible if it's useless, right? Thanks all for the exposition, Will