From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: How the backquote and the comma really work? Date: Thu, 25 Jun 2015 20:53:20 +0200 Message-ID: <87ioabfwm7.fsf@mbork.pl> References: <87vbebg1fs.fsf@mbork.pl> <1e190a42-19c5-4755-b263-4334c402619a@default> <877fqrbpij.fsf@web.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1435258434 23412 80.91.229.3 (25 Jun 2015 18:53:54 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 25 Jun 2015 18:53:54 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jun 25 20:53:47 2015 Return-path: Envelope-to: geh-help-gnu-emacs@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 1Z8CHT-00026x-6G for geh-help-gnu-emacs@m.gmane.org; Thu, 25 Jun 2015 20:53:47 +0200 Original-Received: from localhost ([::1]:57075 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z8CHS-0001Qc-8l for geh-help-gnu-emacs@m.gmane.org; Thu, 25 Jun 2015 14:53:46 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35365) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z8CHG-0001QL-BO for help-gnu-emacs@gnu.org; Thu, 25 Jun 2015 14:53:35 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z8CHC-0006Q9-4O for help-gnu-emacs@gnu.org; Thu, 25 Jun 2015 14:53:34 -0400 Original-Received: from mail.mojserwer.eu ([2a01:5e00:2:52::8]:52007) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z8CHB-0006PE-Tf for help-gnu-emacs@gnu.org; Thu, 25 Jun 2015 14:53:30 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id 21A226F2002 for ; Thu, 25 Jun 2015 20:53:29 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ju41mhUK1rHj for ; Thu, 25 Jun 2015 20:53:26 +0200 (CEST) Original-Received: from localhost (ipz217.internetdsl.tpnet.pl [79.190.154.217]) by mail.mojserwer.eu (Postfix) with ESMTPSA id C2B7E4F607B for ; Thu, 25 Jun 2015 20:53:25 +0200 (CEST) In-reply-to: <877fqrbpij.fsf@web.de> X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2a01:5e00:2:52::8 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:105173 Archived-At: On 2015-06-25, at 20:40, Michael Heerdegen wrote: > Drew Adams writes: > >> So `,foo evaluates variable foo, and `',foo evaluates foo and quotes >> the result. > > Yes, that's an aspect that was missing in the mental model: backquote > works recursively, i.e. unquoting at deeper list levels is handled as > well. > >> (setq titi `',foo) ; => 'bar > > Whereby we don't want to conceal that the "'" is also a reader macro: > 'thing -> (quote thing). > > Here is the expression the reader generates for "`',foo": > > (read "`',foo") ==> (\` (quote (\, foo))) > > (be sure to eval with print-quoted nil, the default). Interesting. I have print-quoted set to nil, however, M-: (eval-expression, or in my case - icicle-pp-eval-expression) does not show what you have here. Does eval-expression (or its Icicles counterpart) mess with print-quoted? > Michael. Best, -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University