From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Augusto Stoffel Newsgroups: gmane.emacs.bugs Subject: bug#62117: 29.0.60; cl-letf on a map place has side-effects Date: Sun, 12 Mar 2023 07:09:56 +0100 Message-ID: <87edpufqkr.fsf@gmail.com> References: <875yb7vijp.fsf@gmail.com> <87sfeaj0tv.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14055"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 62117@debbugs.gnu.org To: Michael Heerdegen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Mar 12 07:11:27 2023 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 1pbEvW-0003Rk-St for geb-bug-gnu-emacs@m.gmane-mx.org; 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Sat, 11 Mar 2023 22:09:58 -0800 (PST) In-Reply-To: <87sfeaj0tv.fsf@web.de> (Michael Heerdegen's message of "Sun, 12 Mar 2023 01:00:12 +0100") 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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:257833 Archived-At: On Sun, 12 Mar 2023 at 01:00, Michael Heerdegen wrote: > Augusto Stoffel writes: > This is a symptom of a general limitation of `cl-letf'. Currently you can't > rely on a "no side effect" behavior. There are other examples like that > (`alist-get') and cases that are worse (binding `buffer-local-value' of > a variable in a buffer with no buffer local binding doesn't remove the > buffer-localness - that's one reason why that gv had been deprecated). Right, so let's drop this bug. >> Of course it's usual to treat a nil entry and no entry as equivalent in >> Lisp, but this behavior can be a problem e.g. when constructing data to >> pass to other programs. > > I would say: if it is a problem, map.el is the wrong abstraction for > your case. That's the genuine idea of map.el: that the inner structure > of a map doesn't matter. This is not right. map.el doesn't abstract away the nil entries. They make a difference all over, e.g. in map-length, map-do, map-empty-p...