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.help Subject: RE: [External] : Re: (interactive) and &optional Date: Sat, 25 Mar 2023 14:33:46 +0000 Message-ID: References: <25628.42021.832534.376361@woitok.gmail.com> <87jzz746ma.fsf@posteo.net> <25630.60070.913514.100455@woitok.gmail.com> <87fs9t3rfz.fsf@posteo.net> Mime-Version: 1.0 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="5059"; mail-complaints-to="usenet@ciao.gmane.io" Cc: "help-gnu-emacs@gnu.org" To: Philip Kaludercic , Dr Rainer Woitok Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Mar 25 15:34:38 2023 Return-path: Envelope-to: geh-help-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 1pg4yc-000122-5N for geh-help-gnu-emacs@m.gmane-mx.org; 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envelope-from=drew.adams@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:143111 Archived-At: > it might also be that you are interning the empty string, > which creates a symbol with an empty string as the symbol name -- which > is not unique. What do you mean by "is not unique"? > > Does an empty symbol have an external representation like an empty list= or string, allowing the use of "eq"? Yes: ## (setq foo (intern "")) C-h v foo foo's value is ## (symbolp '##) ; =3D> t (symbolp foo) ; =3D> t (symbol-name '##) ; =3D> "" (symbol-name foo) ; =3D> "" (setq ## 42) ; or (set foo 42) (symbol-value '##) ; =3D> 42 ## ; =3D> 42 (But note that `C-h v ##' doesn't "work".)