From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms0.migadu.com with LMTPS id cC9DCSb8vmEZvAAAgWs5BA (envelope-from ) for ; Sun, 19 Dec 2021 10:32:22 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id mMUzBSb8vmGpMQAAB5/wlQ (envelope-from ) for ; Sun, 19 Dec 2021 09:32:22 +0000 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 859C435B71 for ; Sun, 19 Dec 2021 10:32:21 +0100 (CET) Received: from localhost ([::1]:36440 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mysYG-0007fF-Lk for larch@yhetil.org; Sun, 19 Dec 2021 04:32:20 -0500 Received: from eggs.gnu.org ([209.51.188.92]:59352) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mysY1-0007ev-Ok for guix-patches@gnu.org; Sun, 19 Dec 2021 04:32:05 -0500 Received: from debbugs.gnu.org ([209.51.188.43]:33260) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mysXy-00062K-6M for guix-patches@gnu.org; Sun, 19 Dec 2021 04:32:05 -0500 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mysXy-0002dr-2b for guix-patches@gnu.org; Sun, 19 Dec 2021 04:32:02 -0500 X-Loop: help-debbugs@gnu.org Subject: [bug#51655] [PATCH] build-system: haskell: Add =?UTF-8?Q?=E2=80=98package-with-explicit-haskell=E2=80=99?= procedure. Resent-From: zimoun Original-Sender: "Debbugs-submit" Resent-CC: guix-patches@gnu.org Resent-Date: Sun, 19 Dec 2021 09:32:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 51655 X-GNU-PR-Package: guix-patches X-GNU-PR-Keywords: patch To: Xinglu Chen , 51655@debbugs.gnu.org Cc: Lars-Dominik Braun Received: via spool by 51655-submit@debbugs.gnu.org id=B51655.16399062727830 (code B ref 51655); Sun, 19 Dec 2021 09:32:02 +0000 Received: (at 51655) by debbugs.gnu.org; 19 Dec 2021 09:31:12 +0000 Received: from localhost ([127.0.0.1]:44806 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mysXA-00021z-Ar for submit@debbugs.gnu.org; Sun, 19 Dec 2021 04:31:12 -0500 Received: from mail-wr1-f49.google.com ([209.85.221.49]:38579) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mysX6-0001tc-7D for 51655@debbugs.gnu.org; Sun, 19 Dec 2021 04:31:08 -0500 Received: by mail-wr1-f49.google.com with SMTP id e5so13560959wrc.5 for <51655@debbugs.gnu.org>; 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spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -2.91 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b="SVmzto/1"; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 859C435B71 X-Spam-Score: -2.91 X-Migadu-Scanner: scn0.migadu.com X-TUID: uQhj8VpK+3kx Hi, On Sun, 19 Dec 2021 at 09:47, Xinglu Chen wrote: >>> +@lisp >>> +(use-modules (guix build-system haskell)) >>> + >>> +(define (default-haskell-8.8) >>> + ;; Lazily resolve the binding to avoid a circular dependency. >>> + (let ((haskell (resolve-interface '(gnu packages haskell)))) >>> + (module-ref haskell 'ghc-8.8))) >>> + >>> +(define package-with-haskell-8.8 >>> + (package-with-explicit-haskell (delay (default-haskell-8.8)) >>> + "ghc-" "ghc-8.8-" >>> + #:variant-property 'ghc-8.8-variant)) >>> +@end lisp >> >> As Lars said, an instance is missing, IMHO. > > Not sure what you are referring to here, what exactly do you mean with > =E2=80=9Cinstance=E2=80=9D? For example, something as: (package-with-haskell-8.8 hledger) Cheers, simon