From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#48219: 27.1.90; CL-LOOP facility fails with hash tables Date: Sat, 02 Jul 2022 16:20:00 -0400 Message-ID: References: <86eeemnawu.fsf@csic.es> <87mtdt59bq.fsf@gnus.org> <87v8sf3ggb.fsf@gnus.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14409"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: Juan =?UTF-8?Q?Jos=C3=A9_?= =?UTF-8?Q?Garc=C3=ADa?= Ripoll , 48219@debbugs.gnu.org To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Jul 02 22:21:22 2022 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 1o7jcH-0003aK-RC for geb-bug-gnu-emacs@m.gmane-mx.org; 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h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=ajIrJ1Wwf5mMqah7162B7mKMFOiWEh6xv5KyRqZTZLnmDz+qW1YSmHo2s6AbI72WH I+iMHNFGqU8JXa8DlnKMdiPONJs4NatLZ03BddB7rHLnqTP9mtrO3QSvFT8u2nUG/U AW/FTbGuNWnI5wSpHrgCBQEF20bDgr7Nx7QRmFHCTWEsR3J862HeioekXUJ3+xrVCE M8qHnpHHYwr16Zvx6xbNxE6KHKvvZzWBl6is4EYqHTD5XbrvsNWD0uh8cwhYZn61ab 3ephiCpfSGEdHS/XFkaPCZLhJBy9Q9Vr27UpHHRZOQu253c9ahsU661ySt8EykfPAk zQJXbmHRs8u0A== Original-Received: from alfajor (unknown [45.72.196.165]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 5C6A7120304; Sat, 2 Jul 2022 16:20:01 -0400 (EDT) In-Reply-To: <87v8sf3ggb.fsf@gnus.org> (Lars Ingebrigtsen's message of "Sat, 02 Jul 2022 13:24:36 +0200") 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:235956 Archived-At: Lars Ingebrigtsen [2022-07-02 13:24:36] wrote: > Stefan Monnier writes: >>> Yes, that does seem wrong. >> >> Agreed, but I don't know what the code is supposed to do when `database` >> is not-nil, so I can't even tell if the code is meaningful. > > (cl-loop > for database in nil > for aux = (message "databse: %S" database) > for entry being the hash-values of database > do (message "FOO %S" database)) > > Hm... Oh, yeah -- that's not really a meaningful loop statement, is it? I think it's not because `database` is both a loop variables (i.e. one that iterates over elements of something else) and one of the something else over which we want to iterate. So the only meaningful interpretation I can see would be 2 nested loops, but the `loop` macro is designed to make a single loop, not nested loops. FWIW, I just tried it with `clisp` and it happpily expands it into a single loop which does something weird (it sets up up a hash-table iterator to operator over "the hash-table `database`" but at a time where the `database` variable has not yet been initialized (i.e. it's nil)). > But since it's a meaningless loop, perhaps erroring out in the hash > table case is fine, too? I'm OK with erroring out if we can emit a meaning error message. > Whew! That was simple! Occam's razor, man: it's all in the shave! Stefan "who doesn't shave"