From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: Question on pcase Date: Fri, 23 Oct 2015 15:07:13 +0200 Message-ID: <87wpud68e6.fsf@web.de> References: <871tcngdv2.fsf@gmail.com> <87k2qe1u09.fsf@web.de> <83r3kmrtat.fsf@gnu.org> <87k2qdeqym.fsf@gmail.com> <87lhat22pv.fsf@web.de> <87ziz9dadv.fsf@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1445605701 28850 80.91.229.3 (23 Oct 2015 13:08:21 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 23 Oct 2015 13:08:21 +0000 (UTC) Cc: emacs-devel@gnu.org To: Oleh Krehel Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Oct 23 15:08:14 2015 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 1Zpc4i-0005ZW-Te for ged-emacs-devel@m.gmane.org; Fri, 23 Oct 2015 15:08:05 +0200 Original-Received: from localhost ([::1]:38413 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zpc4i-0003Eu-7f for ged-emacs-devel@m.gmane.org; Fri, 23 Oct 2015 09:08:04 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37751) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zpc44-0002gq-Vr for emacs-devel@gnu.org; Fri, 23 Oct 2015 09:07:25 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zpc40-00008C-TP for emacs-devel@gnu.org; Fri, 23 Oct 2015 09:07:24 -0400 Original-Received: from mout.web.de ([212.227.15.14]:49643) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zpc40-00007o-JG for emacs-devel@gnu.org; Fri, 23 Oct 2015 09:07:20 -0400 Original-Received: from drachen.dragon ([90.186.0.245]) by smtp.web.de (mrweb001) with ESMTPSA (Nemesis) id 0Lsy7e-1aV2mV2Zh4-012YKR; Fri, 23 Oct 2015 15:07:17 +0200 In-Reply-To: <87ziz9dadv.fsf@gmail.com> (Oleh Krehel's message of "Fri, 23 Oct 2015 14:42:20 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) X-Provags-ID: V03:K0:YqdyfjmP6uz4YT9Ttgp7c4qgFM2laN4YH3KewYvmBUREUQu+X47 cqFaCU/cxDfSRYHmFLNe5MRN5YLqzyYERnG4bZL3EfLQ4P70W+FYFdnfWuNu3eOKP6lsLPV CLSExQscdoIrQWAHrZtVhXCMrg22ZxC48lWHgleSdC8YOctLRlQ2LQsJe1mLmi1hJG8DnRh 7ppNsdnhu+JEv72glnA6g== X-UI-Out-Filterresults: notjunk:1;V01:K0:jxiFoLYmwJw=:SwcZQkIUtpn8nYJrkkqu2P kBsK0ZkKpt5bpcrpTVDdzmODazpXQfwoI1VFnJLdtATxo1Sg3m9aD0qI+4Fom41pvAaitbOfc 7tXJ61+8w26DGb9+yd9SgXLK0eUa5Gq2/VLGZhM32Qf7p40t6uwhkI69FEiOslWhvOzRH7tz/ i2sx/VqCEBR552epyAJ0POWTPcLR8KGtYl+msZglfMW3MTji8nHyrRa6LEUhCMcFaHLK34Fec ljzJivKWYaEm0rpz41y8QvOvkpksxHVWMdkZYRqs4mffXTPixhwTI+IbrW1FCGAFvEIPMNw2B E4/0glGddfqcMYu9A1sOl3V0eqQYlDKb+B5/QX1PfznrHZKdBsC9N/LtecFqJfkPZgjmqbhvj fd7Kv1QUCO0WgwRIEMk/vXWrqqXNKLYpNXqZrB//N/C/EcpZD7z8IJbmd05f+1H8t13n4YoOY 9N/xkjIYT1KIlSGqD0lafUoNPNFjj1KylbfHv4vTgmgIB040A3/IyPzOJvYpNRziXQQyAs6/b tvyVJAA33LJCWX7CNMVokzusgr6Cuz4wG5zWP+s3tp9jMDtDT2LwMgDX+1Vbi9/69YpxivPw2 BeBZNgds3Dy6aAFv4KS+276vUMqgI8r96Wm22iiyhhNAH2EMth9MzQO+isU3wLAKUFK4Ohb97 tNDZfzjgXyQctCJetBhdZNVUJbf44iC0Lo1Fo5Vb/IC41V2bKj3c754SeF+UJUwhaEi7gQMnD Y1/KzrbdtZVgMu0FAoIvypE7kLV7ZL+8iNJaWtjznnqToJpSkPoQsdW/C3dfe/Zhua1Tqtk3 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 212.227.15.14 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:192483 Archived-At: Oleh Krehel writes: > Thanks Michael, that's almost exactly what I need. The only thing is > that I don't understand what `-bind-' is. That's just a placeholder I used. Depending on what pcase form you are using (`pcase', `pcase-lambda', `pcase-let'), the semantic is a bit different. You can just imagine that it creates a local binding, like `let', and that binding is available in the CODE part of the (PATTERN CODE...) of this branch. The actual code `pcase' produces is easy as well but longer; when I included this aspect in `pcase-demystify-pattern', the result would look more like what you would get with `macroexpand', so I don't think it would be useful, since the semantic is also slightly different in other `pcase' derived macros. Michael.