From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.bugs,gmane.emacs.help Subject: Re: (progn (top-level) A B C) Date: Wed, 14 Feb 2007 18:48:38 +0100 Message-ID: References: <3473217.139831171474628637.JavaMail.www@wwinf4102> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: sea.gmane.org 1171475362 23806 80.91.229.12 (14 Feb 2007 17:49:22 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Wed, 14 Feb 2007 17:49:22 +0000 (UTC) Cc: "Emacs Help \[help-gnu-emacs\]" , "Lennart Borgman \(gmail\)" , "Emacs Bug \[bug-gnu-emacs\]" To: alinsoar@voila.fr Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Feb 14 18:49:11 2007 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1HHOFR-0004A4-Sn for geb-bug-gnu-emacs@m.gmane.org; Wed, 14 Feb 2007 18:48:54 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HHOFR-0001sG-I1 for geb-bug-gnu-emacs@m.gmane.org; Wed, 14 Feb 2007 12:48:53 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1HHOFL-0001kY-FX for bug-gnu-emacs@gnu.org; Wed, 14 Feb 2007 12:48:47 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1HHOFH-0001eE-VA for bug-gnu-emacs@gnu.org; Wed, 14 Feb 2007 12:48:46 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HHOFH-0001e5-RP; Wed, 14 Feb 2007 12:48:43 -0500 Original-Received: from mx2.suse.de ([195.135.220.15]) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1HHOFH-00062f-67; Wed, 14 Feb 2007 12:48:43 -0500 Original-Received: from Relay2.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id 716A521096; Wed, 14 Feb 2007 18:48:40 +0100 (CET) X-Yow: They don't hire PERSONAL PINHEADS, Mr. Toad! In-Reply-To: <3473217.139831171474628637.JavaMail.www@wwinf4102> (A. Soare's message of "Wed, 14 Feb 2007 18:37:08 +0100 (CET)") User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.91 (gnu/linux) X-detected-kernel: Linux 2.4-2.6 X-BeenThere: bug-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:15587 gmane.emacs.help:41209 Archived-At: A Soare writes: > Thanks, I will check. Another method that I found is > > (unwind-protect > (prog1 > (message "x") > (top-level)) > (message "a") > (message "b")) > > > By the way, this code returns "Back to top level." . BAD. It does not return anything. > x > a > b > Back to top level. > > What is the definition of prog1? It should return the first argument. I= t seems that in this case the 1st argument is lost. This is not a bug. (top-level) throws to 'top-level, thus (prog1 ...) is never finished. unwind-protect only returns a value if the body complete= s normally. Otherwise it does not return anything, rather execution is transferred directly to the receiving exception handler after executing the unwind forms. Andreas. --=20 Andreas Schwab, SuSE Labs, schwab@suse.de SuSE Linux Products GmbH, Maxfeldstra=DFe 5, 90409 N=FCrnberg, Germany PGP key fingerprint =3D 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED= 5 "And now for something completely different."