From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu Newsgroups: gmane.emacs.devel Subject: Re: Unbinding let-bound built-in variables Date: Fri, 24 May 2024 09:30:53 +0800 Message-ID: <871q5sc7xu.fsf@yahoo.com> References: <87pltdcaa7.fsf.ref@yahoo.com> <87pltdcaa7.fsf@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37966"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Stefan Monnier To: Stefan Monnier via "Emacs development discussions." 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Hermes SMTP Server) with ESMTPA ID 10c1c778836d2adf9160948844dc3057; Fri, 24 May 2024 01:31:00 +0000 (UTC) In-Reply-To: (Stefan Monnier via's message of "Thu, 23 May 2024 10:47:15 -0400") X-Mailer: WebService/1.1.22356 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Received-SPF: pass client-ip=66.163.188.206; envelope-from=luangruo@yahoo.com; helo=sonic311-25.consmr.mail.ne1.yahoo.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:319529 Archived-At: Stefan Monnier via "Emacs development discussions." writes: > I've been uncomfortable with the part you describe as "reasonable" ever > since I noticed it. Why? It's precisely the behavior I would expect from unbinding a built-in variable. > Maybe the best option is to signal an error if you try to `makunbound` > such a forwarded var. > > We could also refrain from clearing the forwarding when we `makunbound`, > but my understanding is that we don't want to do that because the > `Qunbound` value might then leak from the C code to ELisp. Isn't Qunbound treated identically by Fsymbol_value and company, whether its source be a forward or otherwise?