From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tom Levy Newsgroups: gmane.emacs.bugs Subject: bug#59576: 29.0.50; named-let doesn't support dynamic binding Date: Sat, 26 Nov 2022 23:36:10 +1300 Message-ID: References: <8DE91C19-0401-4448-82E6-64AA96C677CE@acm.org> 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="37665"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Monnier , 59576@debbugs.gnu.org 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 Sat Nov 26 11:37:10 2022 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 1oysYX-0009cy-Fc for geb-bug-gnu-emacs@m.gmane-mx.org; 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=D9ZtBWI3d3IYdj/XvTauvUEwPkdc6j71J7B828tKEso=; b=EfjxnlVpvI19Ug4cL4jtZ4b/tR4ISBaK0rVxg7U6tmZ+wvfbJ1TvlZIgMNwJQNXqj5 dqdT1jwvkw0CjeI2lIDTl5Y1IHxxQ96uy7KNmHeL2tpYbyuGPu1GhgB0Cf5vx6LHgtbR PvsGISRvOIgWWCZp4i+7S9ni+X827nKEioBzZ5F+P2IQbnPJBI0To+Oangs92W7nsdmb SZr0AiDOZcakVaWvyoRkylpPpuPxK0SzeyhHev/7jBOPZLi1V5cUX+KIKp81sJHcpwC3 /FRtUrDmbaQxsnym4nOk+ob4FnkpJnaMQE3apWzWCWCydIXzpEMBahr3SqnrtocmXChe qTsQ== X-Gm-Message-State: ANoB5pnmdF+ort743rg2BLZRIrptimOorEe3qUS4ckBpKH88Hsux8APA nSkp+bG+MujTKRGQlJAlunZl5WLpnJvz199m/To= X-Google-Smtp-Source: AA0mqf5q3yWUoErPiwp0zezvrfrIm6YSzeczpmgWkRe67qNSq8KVolYRR87ZumWGfgTIDdMvA3eqQBzGNuCIInpiQS8= X-Received: by 2002:aca:de43:0:b0:35a:7461:8670 with SMTP id v64-20020acade43000000b0035a74618670mr10459180oig.76.1669459006765; Sat, 26 Nov 2022 02:36:46 -0800 (PST) In-Reply-To: <8DE91C19-0401-4448-82E6-64AA96C677CE@acm.org> 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:249068 Archived-At: Personally I'm fine with `named-let' signalling an error in dynamic binding mode. (Regarding worse code in lexical binding mode: There are workarounds. An ugly one is to include both versions of `named-let' and switch between them depending on the binding mode. Another solution is to teach the byte-compiler to inline funcalls to let-bound lambdas; that's more elegant and might also benefit other code, but I have no idea how difficult it would be to implement.) On Sat, 26 Nov 2022 at 22:49, Mattias Engdeg=C3=A5rd wro= te: > > `named-let` being a looping construct, it makes little sense to use it in= dynamic binding where TCO opportunities are severely limited. Ideally we s= hould just signal an error if an attempt to use it in dynbound code is made= . Users will thank us for that (at least they should, if they have any sens= e). > > Second-best would be to inhibit all TCO in dynbound code but whom would t= hat really benefit? > > (Regarding your proposal, generating worse code in lexbind mode isn't a w= onderful outcome.) >