From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Should nil COLLECTION element mean a "nil" candidate for completing-read? Alist doc. Date: Tue, 21 Jul 2009 09:23:04 -0400 Message-ID: References: <5721FBADB175440B9BA3383934E0AC30@us.oracle.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1248182724 27672 80.91.229.12 (21 Jul 2009 13:25:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 21 Jul 2009 13:25:24 +0000 (UTC) Cc: emacs-devel@gnu.org To: "Drew Adams" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Jul 21 15:25:17 2009 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1MTFL4-0005cF-1H for ged-emacs-devel@m.gmane.org; Tue, 21 Jul 2009 15:25:06 +0200 Original-Received: from localhost ([127.0.0.1]:58350 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MTFL2-0005In-Ai for ged-emacs-devel@m.gmane.org; Tue, 21 Jul 2009 09:25:00 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MTFJN-0004hK-Cb for emacs-devel@gnu.org; Tue, 21 Jul 2009 09:23:17 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MTFJH-0004ei-NB for emacs-devel@gnu.org; Tue, 21 Jul 2009 09:23:16 -0400 Original-Received: from [199.232.76.173] (port=38200 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MTFJH-0004ee-Gr for emacs-devel@gnu.org; Tue, 21 Jul 2009 09:23:11 -0400 Original-Received: from ironport2-out.pppoe.ca ([206.248.154.182]:55719 helo=ironport2-out.teksavvy.com) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1MTFJG-00064G-RR for emacs-devel@gnu.org; Tue, 21 Jul 2009 09:23:11 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AsgEAJtdZUpFpZqY/2dsb2JhbACBUc83hAwFhwE X-IronPort-AV: E=Sophos;i="4.43,240,1246852800"; d="scan'208";a="41943014" Original-Received: from 69-165-154-152.dsl.teksavvy.com (HELO pastel.home) ([69.165.154.152]) by ironport2-out.teksavvy.com with ESMTP; 21 Jul 2009 09:23:04 -0400 Original-Received: by pastel.home (Postfix, from userid 20848) id ADEE284A3; Tue, 21 Jul 2009 09:23:04 -0400 (EDT) In-Reply-To: <5721FBADB175440B9BA3383934E0AC30@us.oracle.com> (Drew Adams's message of "Mon, 20 Jul 2009 20:20:59 -0700") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.94 (gnu/linux) X-detected-operating-system: by monty-python.gnu.org: Genre and OS details not recognized. X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:112899 Archived-At: > (completing-read "ff: " '(nil ("a") ("b))) A nil there is simply an error. We don't signal an error, but the none of the behaviors you may see is considered as a feature. Stefan