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: `pp-eval-expression' behaves strangely under lexical binding Date: Sun, 17 Apr 2016 15:43:55 +0200 Message-ID: <87pototkq5.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1460900687 6009 80.91.229.3 (17 Apr 2016 13:44:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 17 Apr 2016 13:44:47 +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 15:44:39 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 1arn0A-0003Kl-Re for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Apr 2016 15:44:38 +0200 Original-Received: from localhost ([::1]:46364 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1arn07-0002e9-17 for geh-help-gnu-emacs@m.gmane.org; Sun, 17 Apr 2016 09:44:35 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:37533) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1armzu-0002b7-Mv for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 09:44:23 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1armzr-00075h-Gp for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 09:44:22 -0400 Original-Received: from mail.mojserwer.eu ([2a01:5e00:2:52::8]:34441) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1armzr-00072C-9x for help-gnu-emacs@gnu.org; Sun, 17 Apr 2016 09:44:19 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id E1989AD17B4 for ; Sun, 17 Apr 2016 15:44:09 +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 pAWdndzvkXUM for ; Sun, 17 Apr 2016 15:44:01 +0200 (CEST) Original-Received: from localhost (98-171.echostar.pl [213.156.98.171]) by mail.mojserwer.eu (Postfix) with ESMTPSA id A1242AD17B1 for ; Sun, 17 Apr 2016 15:43:59 +0200 (CEST) User-agent: mu4e 0.9.13; emacs 25.1.50.8 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:109780 Archived-At: 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? Best -- Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University