From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Lawrence Mitchell Newsgroups: gmane.emacs.bugs Subject: bug#8711: 24.0.50; binding _ to unused values with lexical-binding Date: Mon, 23 May 2011 10:01:04 +0100 Message-ID: References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1306141331 9372 80.91.229.12 (23 May 2011 09:02:11 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 23 May 2011 09:02:11 +0000 (UTC) To: bug-gnu-emacs@gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon May 23 11:02:08 2011 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1QOR1b-0003YA-4n for geb-bug-gnu-emacs@m.gmane.org; Mon, 23 May 2011 11:02:07 +0200 Original-Received: from localhost ([::1]:33483 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QOR1a-0002fI-Nb for geb-bug-gnu-emacs@m.gmane.org; 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Mon, 23 May 2011 05:01:25 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QOR0p-0000rS-Gf for bug-gnu-emacs@gnu.org; Mon, 23 May 2011 05:01:25 -0400 Original-Received: from lo.gmane.org ([80.91.229.12]:44856) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QOR0p-0000qq-Ap for bug-gnu-emacs@gnu.org; Mon, 23 May 2011 05:01:19 -0400 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1QOR0m-00032N-6n for bug-gnu-emacs@gnu.org; Mon, 23 May 2011 11:01:16 +0200 Original-Received: from e4300lm.epcc.ed.ac.uk ([129.215.63.156]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 23 May 2011 11:01:16 +0200 Original-Received: from wence by e4300lm.epcc.ed.ac.uk with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 23 May 2011 11:01:16 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 28 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: e4300lm.epcc.ed.ac.uk User-Agent: Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.50 (gnu/linux) Cancel-Lock: sha1:sf/qKSmsg/OtFZ/UxbhlMWi2GXM= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Mon, 23 May 2011 05:02:02 -0400 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:46654 Archived-At: Helmut Eller wrote: > There seems be no way to avoid a warning in code like this: > ;; -*- lexical-binding: t -*- > (eval-when-compile (require 'cl)) > (defun foo (x) (destructuring-bind (_) x)) > (defun bar (x) (destructuring-bind (_) x (ignore _))) > In foo the compiler complains because _ is never used and > it bar it complains because it is used. This latter is because cconv-analyse-use is not smart enough when checking for use of variables starting with an underscore. ;; -*- lexical-binding: t -*- (let ((_ nil)) (ignore _)) => Warning: variable `_' not left unused. This despite ignore not touching it. Lawrence -- Lawrence Mitchell