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: `pp-eval-expression' behaves strangely under lexical binding Date: Sun, 17 Apr 2016 16:33:10 +0200 Message-ID: <87mvostie1.fsf@mbork.pl> References: <87pototkq5.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1460903637 16420 80.91.229.3 (17 Apr 2016 14:33:57 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 17 Apr 2016 14:33:57 +0000 (UTC) To: Help Gnu Emacs mailing list Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Apr 17 16:33:51 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 1arnln-0002NN-8P for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Apr 2016 16:33:51 +0200 Original-Received: from localhost ([::1]:47016 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1arnlm-0006i0-0X for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Apr 2016 10:33:50 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:46592) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1arnlZ-0006en-LO for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 10:33:38 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1arnlW-0001GC-GH for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 10:33:37 -0400 Original-Received: from mail.mojserwer.eu ([2a01:5e00:2:52::8]:50495) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1arnlW-0001G3-9g for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 10:33:34 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id CC266AD1AD2 for ; Sun, 17 Apr 2016 16:33:22 +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 ZGMkZusrctu0 for ; Sun, 17 Apr 2016 16:33:16 +0200 (CEST) Original-Received: from localhost (98-171.echostar.pl [213.156.98.171]) by mail.mojserwer.eu (Postfix) with ESMTPSA id 4FF95AD1AD0 for ; Sun, 17 Apr 2016 16:33:14 +0200 (CEST) User-agent: mu4e 0.9.13; emacs 25.1.50.8 In-reply-to: <87pototkq5.fsf@mbork.pl> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2a01:5e00:2:52::8 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:109781 Archived-At: On 2016-04-17, at 13:43, Marcin Borkowski wrote: > Hi all, > > put this in an empty buffer, call `normal-mode' (so that > `lexical-binding' is set to t) and evaluate: > > --8<---------------cut here---------------start------------->8--- > ;;; -*- lexical-binding: t; -*- > (setq spam 'eggs) > (let ((spam 'bacon)) > (pp-eval-expression 'spam) > (message "%s" spam)) > --8<---------------cut here---------------end--------------->8--- > > Then look at *Messages*: "eggs" is printed, then "bacon". > > I wanted to use `pp-eval-expression' when debugging (basically as > a pretty-printing variant of `message'), and this behavior hit me. Why > does this behave in this way, and is it a feature or a bug? OK, never mind: `pp-eval-expression' is defined in Lisp, so it cannot work any other way. But isn't my question still valid for `symbol-value'? Best, -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University