From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andy Moreton Newsgroups: gmane.emacs.help Subject: Re: `pp-eval-expression' behaves strangely under lexical binding Date: Mon, 18 Apr 2016 16:07:24 +0100 Message-ID: References: <87pototkq5.fsf@mbork.pl> <87mvostie1.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1460992084 18079 80.91.229.3 (18 Apr 2016 15:08:04 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 18 Apr 2016 15:08:04 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Apr 18 17:07:55 2016 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 1asAmI-0003wx-RA for geh-help-gnu-emacs@m.gmane.org; Mon, 18 Apr 2016 17:07:54 +0200 Original-Received: from localhost ([::1]:39500 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1asAmI-0000IQ-0n for geh-help-gnu-emacs@m.gmane.org; Mon, 18 Apr 2016 11:07:54 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39286) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1asAm6-0000F4-40 for help-gnu-emacs@gnu.org; Mon, 18 Apr 2016 11:07:42 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1asAm2-0008Pl-3E for help-gnu-emacs@gnu.org; Mon, 18 Apr 2016 11:07:42 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:41615) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1asAm1-0008Pb-TM for help-gnu-emacs@gnu.org; Mon, 18 Apr 2016 11:07:38 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1asAlv-0003ly-Ap for help-gnu-emacs@gnu.org; Mon, 18 Apr 2016 17:07:31 +0200 Original-Received: from uk.solarflare.com ([193.34.186.16]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 18 Apr 2016 17:07:31 +0200 Original-Received: from andrewjmoreton by uk.solarflare.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 18 Apr 2016 17:07:31 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 20 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: uk.solarflare.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.92 (windows-nt) Cancel-Lock: sha1:atSiuV6uyO2ScCtiRioBWT4MXsg= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.help:109786 Archived-At: On Sun 17 Apr 2016, Stefan Monnier wrote: >> But isn't my question still valid for `symbol-value'? > > No, whether it's implemented in C or in Lisp is irrelevant. As soon as > you put a symbol into a `quote`, it can't be a reference to a lexical > variable any more because the compiler will treat it as data and data > cannot refer to lexical variables, only to other data. > > Dynamically scoped variables are data, on the other hand (they're just > a particular field of a symbol object, which is a kind of "struct"). Hi Stefan, This short description is very helpful. Could you add some similar wording to the elisp manual to help clarify usage of lexical binding ? Thanks, AndyM