From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Drew Adams Newsgroups: gmane.emacs.bugs Subject: bug#61281: =?UTF-8?Q?=E2=80=9C`?=(a \, b)=?UTF-8?Q?=E2=80=9D?= equals to =?UTF-8?Q?=E2=80=9C`?=(a . , b)=?UTF-8?Q?=E2=80=9D?= Date: Sun, 5 Feb 2023 03:30:40 +0000 Message-ID: References: <87a61tgdkx.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="26506"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Xie Shynur , "61281@debbugs.gnu.org" <61281@debbugs.gnu.org> To: Michael Heerdegen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Feb 05 04:31:33 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 1pOVka-0006kD-FQ for geb-bug-gnu-emacs@m.gmane-mx.org; 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(\, b)), which is another syntax for > `(a . ,b) ? Well, yes. And that's no doubt why we get that. But (\, b) shouldn't be handled as ,b. I know that it is - in Elisp. I don't think it should be. To me, that spells (faulty) implementation leaking out. > With other words, I think `(a \, b) and `(a . ,b) are different read > syntaxes for the same expression, equivalent to (cons 'a b). Yes, but see above. I think \, should be read as the symbol whose print name is ",". To me, `(a \, b) should be treated like (a foo b): a list of 3 symbols - no evaluation. And `(a \,b) should be treated as a list of two symbols, whose print names are "a" and ",b". The symbol \, should be read as just a symbol. The same is not true of just an unescaped comma - outside a backquoted sexp that raises an error, and inside one it's handled specially as part of the backquote syntax. \, is not just , I don't have another Lisp interpreter, but I'm guessing that Common Lisp does what I expect. (For Common Lisp also, \ escapes a character.)=20