From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#47677: [PATCH] condition-case success continuation Date: Tue, 13 Apr 2021 10:52:54 +0200 Message-ID: References: <219007D9-0FD0-4AC2-A8B0-24A0FC277AE8@acm.org> <87lf9nzy48.fsf@gnus.org> <87F315E7-7F8A-46C5-A71B-F090F067D0B8@acm.org> <87sg3uskgt.fsf@gnus.org> Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.17\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37207"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Monnier , 47677@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Apr 13 10:54:18 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lWEoM-0009Zp-H0 for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 13 Apr 2021 08:52:56 +0000 In-Reply-To: <87sg3uskgt.fsf@gnus.org> X-Mailer: Apple Mail (2.3445.104.17) X-CTCH-RefID: str=0001.0A742F24.60755BE9.0033, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 X-CTCH-VOD: Unknown X-CTCH-Spam: Unknown X-CTCH-Score: 0.000 X-CTCH-Flags: 0 X-CTCH-ScoreCust: 0.000 X-CSC: 0 X-CHA: v=2.3 cv=J9HUEzvS c=1 sm=1 tr=0 a=von4qPfY+hyqc0zmWf0tYQ==:117 a=von4qPfY+hyqc0zmWf0tYQ==:17 a=kj9zAlcOel0A:10 a=M51BFTxLslgA:10 a=OocQHUDgAAAA:8 a=zSyZDcWAF_YP9qBLzdEA:9 a=CjuIK1q_8ugA:10 a=xUZTl98r3Qw_uB5NK3jt:22 X-Origin-Country: SE X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:203955 Archived-At: 13 apr. 2021 kl. 09.38 skrev Lars Ingebrigtsen : >> ((:catch TAG) BODY...) >=20 > I'm not quite sure I understand the use case for this -- we already = have > a general catch/throw infrastructure, so this sounds like a somewhat = odd > addition. Oh, it was just proof-of-concept code to show that such a generalisation = would be possible should it be desired later. It's not part of the = immediate proposal. Sorry about the confusion. Our present `catch` has the same flaw as `condition-case` in that it = does not give access to the success continuation, leading to hacks = similar to the one you mentioned. We could extend `catch` instead, maybe = like this: (catch TAG :in BODY-FORM :success VAR SUCCESS-FORM) but what if you want to catch multiple tags, or both throws and errors? = The constructs don't compose; nesting them hides the success = continuation of the inner forms.