From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Problem when run-hook-with-args with closure Date: Fri, 19 Dec 2014 09:11:45 -0500 Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1418998357 17171 80.91.229.3 (19 Dec 2014 14:12:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 19 Dec 2014 14:12:37 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Dec 19 15:12:29 2014 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 1Y1yI8-0002uZ-Kb for geh-help-gnu-emacs@m.gmane.org; Fri, 19 Dec 2014 15:12:28 +0100 Original-Received: from localhost ([::1]:58759 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y1yI7-000824-QO for geh-help-gnu-emacs@m.gmane.org; Fri, 19 Dec 2014 09:12:27 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39249) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y1yHq-00081n-R7 for help-gnu-emacs@gnu.org; Fri, 19 Dec 2014 09:12:18 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Y1yHh-0005uy-ID for help-gnu-emacs@gnu.org; Fri, 19 Dec 2014 09:12:10 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:40131) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y1yHh-0005ub-BE for help-gnu-emacs@gnu.org; Fri, 19 Dec 2014 09:12:01 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Y1yHf-0002hJ-L2 for help-gnu-emacs@gnu.org; Fri, 19 Dec 2014 15:11:59 +0100 Original-Received: from 206-248-130-192.dsl.teksavvy.com ([206.248.130.192]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 19 Dec 2014 15:11:59 +0100 Original-Received: from monnier by 206-248-130-192.dsl.teksavvy.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 19 Dec 2014 15:11:59 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 206-248-130-192.dsl.teksavvy.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:s7xcga2GEcNX9GsH26AxZFMFHlY= 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: 2.1.14 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:101678 Archived-At: > (setq foo > (lambda (y) > (message "x+y=%d" (+ x y))))) > (run-hook-with-args 'foo 1) Hooks should contain *lists* of functions. The fact that they can also just contain a function is an old backward compatibility hack: better not rely on it. So, if you do it right, you won't hit the bug: (setq foo (list (lambda (y) (message "x+y=%d" (+ x y)))))) (run-hook-with-args 'foo 1) Or better yet: (add-hook 'foo (lambda (y) (message "x+y=%d" (+ x y)))))) (run-hook-with-args 'foo 1) -- Stefan