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#62020: Lisp reader: dotted pair notation not working when initial elements are omitted Date: Tue, 7 Mar 2023 14:31:19 +0100 Message-ID: <3242578A-C50A-4195-B663-F52B05DD80F6@acm.org> References: <838rg87me0.fsf@gnu.org> Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.14\)) 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="40442"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 62020@debbugs.gnu.org, Stefan Monnier , Federico Tedin To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Mar 07 14:32:10 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 1pZXQI-000AEu-3t for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 7 Mar 2023 13:31:24 +0000 In-Reply-To: <838rg87me0.fsf@gnu.org> X-Mailer: Apple Mail (2.3654.120.0.1.14) X-VADE-SPAMSTATE: clean X-VADE-SPAMSCORE: -100 X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrvddutddggeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffquffvqffrkfetpdfqfgfvpdfgpfggqdevhedtnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtvdenucfhrhhomhepofgrthhtihgrshcugfhnghguvghgnohrugcuoehmrghtthhirghsvgesrggtmhdrohhrgheqnecuggftrfgrthhtvghrnhepveekffdujefhkeehvdfgffeikefghfefvdekueffleegfeekueelhfejieefkefgnecukfhppedukeekrdduhedtrddujedurddvtdelnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudekkedrudehtddrudejuddrvddtledphhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpmhgrihhlfhhrohhmpehmrghtthhirghsvgesrggtmhdrohhrghdpnhgspghrtghpthhtohepgedprhgtphhtthhopegvlhhiiiesghhnuhdrohhrghdprhgtphhtthhopehfvgguvghrihgtohhtvgguihhnsehgmhgrihhlrdgtohhmpdhrtg hpthhtohepmhhonhhnihgvrhesihhrohdruhhmohhnthhrvggrlhdrtggrpdhrtghpthhtohepiedvtddvtdesuggvsggsuhhg 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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:257452 Archived-At: Eli, thank you for bringing this to our attention. >> one should be able to evaluate e.g.: >> (. 1) >> to: >> 1 Federico, it would be very easy to change the reader into behaving that = way and I'll do that if required, but before I or anyone else change = code or docs, and above all much more important and interesting would be = to hear exactly why it matters to you and how you were affected by this = corner of the reader semantics. Could be it that you saw the manual passage, decided to try it out -- = which is good, we want more people to do that -- and observed that Emacs = and the manual didn't agree on that point? As far as I can tell while researching ahead of the previous changed, = the documented (old) reader semantics was merely emergent behaviour of = an under-constrained implementation, never a purposeful design for user = convenience. No other Lisp (Common Lisp, Scheme etc) implementation known to me = provides such a reader 'feature', and no evidence of any use of it was = found at the time. This is why your report is of such interest: did it = actually break existing code, and if so, how exactly?