From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#8657: 24.0.50; Emacs code that seems to use `*-single-char-property-change' incorrectly Date: Thu, 12 May 2011 00:05:46 -0300 Message-ID: References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1305169573 724 80.91.229.12 (12 May 2011 03:06:13 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 12 May 2011 03:06:13 +0000 (UTC) Cc: 8657@debbugs.gnu.org To: "Drew Adams" Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu May 12 05:06:09 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 1QKME4-0006es-Dd for geb-bug-gnu-emacs@m.gmane.org; Thu, 12 May 2011 05:06:08 +0200 Original-Received: from localhost ([::1]:40488 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QKME3-00027g-Se for geb-bug-gnu-emacs@m.gmane.org; Wed, 11 May 2011 23:06:07 -0400 Original-Received: from eggs.gnu.org ([140.186.70.92]:45376) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QKMDz-00023n-O2 for bug-gnu-emacs@gnu.org; Wed, 11 May 2011 23:06:04 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QKMDy-0002nw-SN for bug-gnu-emacs@gnu.org; Wed, 11 May 2011 23:06:03 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:58899) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QKMDy-0002np-QS for bug-gnu-emacs@gnu.org; Wed, 11 May 2011 23:06:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.69) (envelope-from ) id 1QKMDy-0003La-9k; Wed, 11 May 2011 23:06:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-To: owner@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 12 May 2011 03:06:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 8657 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 8657-submit@debbugs.gnu.org id=B8657.130516955712855 (code B ref 8657); Thu, 12 May 2011 03:06:02 +0000 Original-Received: (at 8657) by debbugs.gnu.org; 12 May 2011 03:05:57 +0000 Original-Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1QKMDt-0003LI-7T for submit@debbugs.gnu.org; Wed, 11 May 2011 23:05:57 -0400 Original-Received: from fencepost.gnu.org ([140.186.70.10]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1QKMDr-0003L2-J8 for 8657@debbugs.gnu.org; Wed, 11 May 2011 23:05:56 -0400 Original-Received: from 121-249-126-200.fibertel.com.ar ([200.126.249.121]:17643 helo=ceviche.home) by fencepost.gnu.org with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1QKMDl-0002jl-IG; Wed, 11 May 2011 23:05:49 -0400 Original-Received: by ceviche.home (Postfix, from userid 20848) id 2CBBE66152; Thu, 12 May 2011 00:05:46 -0300 (ART) In-Reply-To: (Drew Adams's message of "Wed, 11 May 2011 13:54:57 -0700") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Wed, 11 May 2011 23:06:02 -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:46408 Archived-At: > In particular, IIUC, the return value can never be nil. > Yet I see code such as this: > gnus-summary-show-thread: > (or (next-single-char-property-change end 'invisible) (point-max)) > comint-next-prompt: > (setq pos (next-single-char-property-change pos 'field)) > (cond (or (null pos)... > Isn't this incorrect? The behavior might have changed at some point in time, explaining the above code. Stefan