From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tim Van den Langenbergh Newsgroups: gmane.lisp.guile.devel Subject: Re: list-set! Wrong type argument in position 1 (expecting mutable pair) Date: Wed, 26 Aug 2020 22:22:55 +0200 Message-ID: <3217080.IVKLgIBuA9@terra> References: <20200826151232.Horde.54lAstMht7PXoKcNHhj8vJT@www.stihie.net> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2150020.nmYSbCQShS"; micalg="pgp-sha256"; protocol="application/pgp-signature" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12771"; mail-complaints-to="usenet@ciao.gmane.io" Cc: guile-devel To: mbcladwell@stihie.net Original-X-From: guile-devel-bounces+guile-devel=m.gmane-mx.org@gnu.org Wed Aug 26 22:45:59 2020 Return-path: Envelope-to: guile-devel@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 1kB2Iw-0003AY-6r for guile-devel@m.gmane-mx.org; Wed, 26 Aug 2020 22:45:58 +0200 Original-Received: from localhost ([::1]:46648 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kB2Iv-0004DY-35 for guile-devel@m.gmane-mx.org; Wed, 26 Aug 2020 16:45:57 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54294) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kB1x4-0008Cx-LI for guile-devel@gnu.org; Wed, 26 Aug 2020 16:23:22 -0400 Original-Received: from mout.gmx.net ([212.227.15.18]:51109) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kB1x2-00055G-Hd for guile-devel@gnu.org; Wed, 26 Aug 2020 16:23:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1598473382; bh=l3NIXOD/NJfSUa/L4NM62AsbsWmkOXZO9W7Ax7T3mKk=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=Qg+JGNhPA2uHZfdqZ39hiPWFARll8VgXgoqE0MyKSE+rZPSG1Gdu2MXUPXFjBd7MR ogNUMZFbe68PvcGmmKtfUNFVJzPBk2d7PQS1LOHbSAJ0BtiWbuKDXVeq8hz5D1+M1E horU0o6fqb1lgzTWnQQnh9+HM2VYcz3JZeSrP+aI= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Original-Received: from terra.localnet ([94.227.125.226]) by mail.gmx.com (mrgmx005 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MYeMj-1k6LGH2Yb5-00VdhG; Wed, 26 Aug 2020 22:23:02 +0200 In-Reply-To: <20200826151232.Horde.54lAstMht7PXoKcNHhj8vJT@www.stihie.net> X-Provags-ID: V03:K1:75yOu98+26e1tU9Seyl6DL4jLU0RyBmWe2hCMls2SE4KnOH2rPa qTI6YnMO+22CG9F1oP3SA5INPURPadgzqBZBcGu6/Wx2hqOtcBT3S82nftYug9o8cCsZmNj MgN2ktRo/T2ayGK83Z1aG3bKlaK7IC9oJiSHtdd3O6IBwt4gufmm+wdP9LAbXUo+Y2UDOWJ NgacSXPuiqOjYFZK2bDrg== X-UI-Out-Filterresults: notjunk:1;V03:K0:OA71yt+Yn2Y=:EtkxTYRKYt5qxH4JJcSUBC d/WjiOkTZ/QL8ICwWU0EDHBiNlufwOcqEr+Y4OxgYNnIus7YGwO5HPzjCY3L7JprdEseS4XUy h9N9+4LtZSXVxbV9iG9ueLS64FmI4GwD/sErfQqm8n7rp0+tY9c0P2TOB1ShIcnczO/cgmICn arUBqXxoGaQAGGssAITkeOAZ0YrtYGslZZJczWPtbNi1VUXNmlLmYifkRA32AaL+zTo1942qP THZmPyUueWTH+/MKYbnyjZtIbgYrBIgbBP4QSTl4U34sJZASsISNe+LDLHdc5ZSsxMu1K+r0e 1k/AWA+g4ghk7oKSmfFkaqoOa4vbOCclfnFT4YNG1sBI8YAQpxG1SKJllg6POh3ZzV2LWZE1g WC/mNBN29WoFuU2GHkN0wUbyY6ebP/SN2tBV04Jx5oiVObqICwsOoDi19xjLCUAGOjv7vW4HG WdjcngcuVn9mVejfi55hJbyvsgcUbgwca1P3mgHRw8epjIgjJkLWPm7aJapd1sL4vur8i1qkz MhrT2JaGqOhNJivFPRinhsP7a7FdKkp6ZN3ch4uGgndAzMFlfKicVc7WM0rz+qyEMfIcyI69e s7haR8P5G5JJgqqSt2i8CNOCljkTra3vEDzs5axbVlbZhzD14nsSamE2WKc4re4csGDCvXNz9 YnSjRlM7LqLyuqG3EDPv1W8/eZezBWygM3EPZW34gC6dC8Y/c7RWRTMliGFuOm4P5CNFUpLdQ GBk/KZXHI0roDWUU8u75lrqfzMBpxV6gc46AjC+zHH9R3gP8uEF82mzNK5b2uRbT0ZwkBP8F Received-SPF: pass client-ip=212.227.15.18; envelope-from=tmt_vdl@gmx.com; helo=mout.gmx.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/26 16:23:16 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, 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-Mailman-Approved-At: Wed, 26 Aug 2020 16:44:53 -0400 X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guile-devel-bounces+guile-devel=m.gmane-mx.org@gnu.org Original-Sender: "guile-devel" Xref: news.gmane.io gmane.lisp.guile.devel:20580 Archived-At: --nextPart2150020.nmYSbCQShS Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii"; protected-headers="v1" From: Tim Van den Langenbergh To: mbcladwell@stihie.net Cc: guile-devel Subject: Re: list-set! Wrong type argument in position 1 (expecting mutable pair) Date: Wed, 26 Aug 2020 22:22:55 +0200 Message-ID: <3217080.IVKLgIBuA9@terra> In-Reply-To: <20200826151232.Horde.54lAstMht7PXoKcNHhj8vJT@www.stihie.net> References: <20200826151232.Horde.54lAstMht7PXoKcNHhj8vJT@www.stihie.net> Hey, yeah, a quoted list is immutable (at least in Guile). You could do something like... (define my-list (list "zero" "one" "twooo") (list-set! my-list 2 "two") my-list Don't forget that list-set! returns the new element, rather than the modif= ied list. Cheers, -Tim On Wednesday, 26 August 2020 22:12:32 CEST you wrote: > > Hi, > One shortcoming I find working with Guile is the limited number of > examples of how to use code. Consider list-set!. The only reference in > the entire Guile manual is the definition in section 6.6.9.6 List > Modification. If I google I find > https://docs.racket-lang.org/reference/pairs.html which gives me the > example (list-set '(zero one two) 2 "two") =3D=3D> '(zero one "two") whi= ch > is what I deduced from the Guile manual. If I try something similar > in Guile: > > scheme@(guile-user)> (list-set! '("zero" "one" "twooooo") 2 "two") > ice-9/boot-9.scm:1669:16: In procedure raise-exception: > In procedure set-car!: Wrong type argument in position 1 (expecting > mutable pair): ("twooooo") > > Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue. > scheme@(guile-user) [1]> ,bt > 1 (list-set! ("zero" "one" "twooooo") 2 "two") > In ice-9/boot-9.scm: > 1669:16 0 (raise-exception _ #:continuable? _) > > Could someone provide me with an example of how to use list-set! ? > Alternatively what I really need is how to modify a specified element > in a list. > Thanks > Mortimer > --nextPart2150020.nmYSbCQShS Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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