From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gerd =?UTF-8?Q?M=C3=B6llmann?= Newsgroups: gmane.emacs.bugs Subject: bug#68668: 30.0.50; Invalid hash table test: tab-bar--auto-width-hash-test Date: Wed, 31 Jan 2024 14:34:52 +0100 Message-ID: References: <8734uovhj6.fsf@gmail.com> <87a5onhhik.fsf@posteo.de> <86o7d32ep3.fsf@gnu.org> <87v87a7qbd.fsf@pub.pink> <8C5539AC-A3F9-4EE9-BFD5-FE5D9F760801@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32139"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Mekeor Melire , john muhl , 68668@debbugs.gnu.org, Eli Zaretskii , Andrea Corallo , Stefan Monnier To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jan 31 14:36:09 2024 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 1rVAl7-0008CV-Bs for geb-bug-gnu-emacs@m.gmane-mx.org; 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[79.227.165.240]) by smtp.gmail.com with ESMTPSA id az28-20020adfe19c000000b0033afcf8925asm3880655wrb.24.2024.01.31.05.34.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Jan 2024 05:34:53 -0800 (PST) In-Reply-To: <8C5539AC-A3F9-4EE9-BFD5-FE5D9F760801@gmail.com> ("Mattias =?UTF-8?Q?Engdeg=C3=A5rd?="'s message of "Wed, 31 Jan 2024 14:18:57 +0100") 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:279224 Archived-At: Mattias Engdeg=C3=A5rd writes: > 31 jan. 2024 kl. 14.05 skrev Gerd M=C3=B6llmann : > >> why not reuse an existing entry for a given name? > > We mustn't violate invariants of existing hash-table objects when the > test is redefined. Consider: > > (define-hash-table-test 'mytest #'cmp1 #'hash1) > (setq h (make-hash-table :test 'mytest)) > ... > (define-hash-table-test 'mytest #'cmp2 #'hash2) > ; h must still use cmp1 and hash1 at this point But that also means that we end up with two sorts of hash-tables that behave differently, without us being able to tell them apart, because hash-table-test returns 'mytest for both. I think I'd prefer if that were not the case, and the redefinition would apply to both. If an old hash-table then behaves stragely, I know what's up, and can empty it, if it isn't still empty in the first place. Just my 2 cents.