From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp12.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id uICPGUDc9mLCZQAAbAwnHQ (envelope-from ) for ; Sat, 13 Aug 2022 01:03:28 +0200 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp12.migadu.com with LMTPS id CMllGUDc9mKBLAAAauVa8A (envelope-from ) for ; Sat, 13 Aug 2022 01:03:28 +0200 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 346FCC3C1 for ; Sat, 13 Aug 2022 01:03:28 +0200 (CEST) Received: from localhost ([::1]:57572 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oMdgd-00069Z-3q for larch@yhetil.org; Fri, 12 Aug 2022 19:03:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52974) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oMdgN-00064S-6u for help-guix@gnu.org; Fri, 12 Aug 2022 19:03:11 -0400 Received: from mx1.dismail.de ([78.46.223.134]:32337) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oMdgK-0002XL-Et for help-guix@gnu.org; Fri, 12 Aug 2022 19:03:10 -0400 Received: from mx1.dismail.de (localhost [127.0.0.1]) by mx1.dismail.de (OpenSMTPD) with ESMTP id e0211923 for ; Sat, 13 Aug 2022 01:02:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=dismail.de; h=date :message-id:from:to:subject:references:mime-version:content-type :content-transfer-encoding; s=20190914; bh=7XoFMXw9KTJSmTD6tbzoE xJSNAw5q2gcssa44tHakuc=; b=ItxFAzS0qdREOBaMIj43hMtieWgQmetex2DBK gNdacDJL/DkDi6UXt5sd+j/CHeQ06RO9wHRgN4408kcMtJWfPW5egYB9z/UoPwnS occzZ22o6Z06TWcbUnKsivRo/929lF3npqM31HtfQwx811+fuhoJan0DarEdYsHX TIz4uZ8saSNden7WFXny5iQXzI1AF0tBziSXveNLZ3DWgZcecdk6+nf2rEe9EnWK REqJaFGZwb0uz4TnFRhsllYtVw7XGGHetG6jqxBKGw7tgOOMrCmO42+NrHrOvaHp TISdxpV3SS/Zk36L0Ju97sIsJKmhn6gEFTCB5qS1z/8A/PL/A== Received: from smtp2.dismail.de ( [10.240.26.12]) by mx1.dismail.de (OpenSMTPD) with ESMTP id 9f26ee37 for ; Sat, 13 Aug 2022 01:02:59 +0200 (CEST) Received: from smtp2.dismail.de (localhost [127.0.0.1]) by smtp2.dismail.de (OpenSMTPD) with ESMTP id 9ebae9f1 for ; Sat, 13 Aug 2022 01:02:59 +0200 (CEST) Received: by dismail.de (OpenSMTPD) with ESMTPSA id da77292f (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO) for ; Sat, 13 Aug 2022 01:02:58 +0200 (CEST) Date: Fri, 12 Aug 2022 18:03:06 -0500 Message-ID: <20220812180306.GB2813@gac> From: jgart To: Guix Help Subject: xcons is a con? References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=78.46.223.134; envelope-from=jgart@dismail.de; helo=mx1.dismail.de 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-guix@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+larch=yhetil.org@gnu.org Sender: "Help-Guix" X-Migadu-Flow: FLOW_IN X-Migadu-To: larch@yhetil.org X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1660345408; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references:list-id:list-help:list-unsubscribe: list-subscribe:list-post:dkim-signature; bh=7XoFMXw9KTJSmTD6tbzoExJSNAw5q2gcssa44tHakuc=; b=HtuZZFOO2U6N/bUg5WLKRF2QOJGh5dGa4tGSx7VDyxrKQsH2h2VuzTAl0p6GYrQH4J0A/e EpkOxb95IpeQZd29DEBssb5s8Whzt0O3i9SYUYa8ybEdwCbl4ESeNEnreFObZrLOq9Kwa7 HB9R1LXhsOCin0L2GnIgQ5+paDw2HhtNJ6H5MJLKzIwVJarBeeqtcYIXQJ4OSjKSMAe85s hLdhDkhX1YXntV1lOl/0SV+NvHKhytAa4J2eDWk8N/J26fWmZ/wIh7w13Np8hnWcxQCpMQ vuIyyPA364Wqu0bkZa+7/fctlxQ5obC48xSJyY7GfnLn4ww/y5rmFaNcWrrCzg== ARC-Seal: i=1; s=key1; d=yhetil.org; t=1660345408; a=rsa-sha256; cv=none; b=KneoBrHPD7Q42wE0a8LhQRabVrVIK+gHDjCofy5gzTkkkxqaac5z5j9JNvvpsbJyU2TT6/ tMv3yH2oefUTLm4aYhpnJcIalo7t0XM0UhKvwQLUJtdq5dq948LD0iFP9G2X36d7vcfxSX mIfvhh75h8IpwZc98GjzYcpMpiu486uoCgtB+g68i97TpPt3FBJAzDAxsKqrhY7sZQfpw6 Zw8ahZWhkXvN92iTcVAAtq2MB7aewHT0NpJz1i4qZLDYpuu3l022Uxs2iHMzrmJsk0Cs2W r+qLTHy6I/uem/2Y40vLTLAIULLfEBgBg0DWg3PsAzJHWW2OV1oxFdLWN5mYnA== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=dismail.de header.s=20190914 header.b=ItxFAzS0; dmarc=pass (policy=reject) header.from=dismail.de; spf=pass (aspmx1.migadu.com: domain of "help-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="help-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -6.67 Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=dismail.de header.s=20190914 header.b=ItxFAzS0; dmarc=pass (policy=reject) header.from=dismail.de; spf=pass (aspmx1.migadu.com: domain of "help-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="help-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 346FCC3C1 X-Spam-Score: -6.67 X-Migadu-Scanner: scn0.migadu.com X-TUID: QJJDybv5nLiF Hi Guixers, What is a non-trivial use of xcons in the context of a hof? I realize I can use fold to reverse a list with xcons but how do guixers use xcons in the common practice?