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Subject: [bug#34137] [PATCH 1/2] gnu: Add ghc-mtl.
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From: Timothy Sample <samplet@ngyro.com>
References: <878szgv0tw.fsf@gmail.com>
Date: Sun, 20 Jan 2019 11:26:47 -0500
In-Reply-To: <878szgv0tw.fsf@gmail.com> (Gabriel Hondet's message of "Sat, 19
	Jan 2019 21:34:52 +0100")
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To: Gabriel Hondet <gabrielhondet@gmail.com>
Cc: 34137@debbugs.gnu.org

Hi Gabriel,

Gabriel Hondet <gabrielhondet@gmail.com> writes:

> * gnu/packages/haskell.scm (ghc-mtl): New variable.

Thank you very much for the patch!

GHC 8.4.3 has ghc-mtl built-in.  This means that we don=E2=80=99t need to h=
ave a
separate package for it.  We used to have a package for it, but it was
removed in commit f54f04756f6d90c9fb3b5e45f3947329287f9b05 as a part of
upgrading GHC.  We try to avoid having separate packages for Haskell
libraries that are built-in to GHC because they cause problems
(incompatibilities in the dependency graph).

You should be able to remove the =E2=80=9Cghc-mtl=E2=80=9D input from the M=
PD package
without any issue.

(Sadly, the importer is not clever enough to filter out built-in
libraries, so it has to be done manually.)

> [...]


-- Tim