From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: goof in small function where??? Date: Tue, 22 Jul 2014 13:07:30 +0200 Message-ID: <87bnsh1wjx.fsf@web.de> References: <53CE2D32.2070502@mousecar.com> <87ha291zkf.fsf@web.de> <53CE3CD1.9050908@mousecar.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1406027296 10257 80.91.229.3 (22 Jul 2014 11:08:16 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 22 Jul 2014 11:08:16 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Jul 22 13:08:09 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 1X9XvV-0006x3-38 for geh-help-gnu-emacs@m.gmane.org; Tue, 22 Jul 2014 13:08:09 +0200 Original-Received: from localhost ([::1]:38566 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9XvU-0003xa-8Q for geh-help-gnu-emacs@m.gmane.org; Tue, 22 Jul 2014 07:08:08 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51436) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9XvD-0003x5-DV for help-gnu-emacs@gnu.org; Tue, 22 Jul 2014 07:07:58 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X9Xv6-0001rH-G3 for help-gnu-emacs@gnu.org; Tue, 22 Jul 2014 07:07:51 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:46176) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X9Xv6-0001r5-9v for help-gnu-emacs@gnu.org; Tue, 22 Jul 2014 07:07:44 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1X9Xv5-0006cT-6q for help-gnu-emacs@gnu.org; Tue, 22 Jul 2014 13:07:43 +0200 Original-Received: from dslb-094-217-127-201.pools.arcor-ip.net ([94.217.127.201]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 22 Jul 2014 13:07:43 +0200 Original-Received: from michael_heerdegen by dslb-094-217-127-201.pools.arcor-ip.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 22 Jul 2014 13:07:43 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 22 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: dslb-094-217-127-201.pools.arcor-ip.net User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.92 (gnu/linux) Cancel-Lock: sha1:7rq2yR8B4XdFRr4rKFirQK6iVxY= 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:98897 Archived-At: ken writes: > I'm vaguely understanding that the 'and' doesn't evaluate > '(message...' when '(kill-new...' returns nil and, since its return > value is undefined, it can do on occasion. Replacing 'and' with > 'when' ensures '(message...' is evaluated regardless of what > '(kill-new...' returns. > > Is that about right? Exactly. `and' is not the right way to tell Emacs "do this _and_ that" ;-) The following would also be ok, btw: (and str (progn (kill-new str) (message "Copied filename %s to kill ring" str))) Regards, Michael.