From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: heads-up: Haskell updates
Date: Sat, 17 Feb 2018 22:51:52 +0100
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To: Mark H Weaver <mhw@netris.org>
Cc: guix-devel <guix-devel@gnu.org>

Hi Mark,

> Unfortunately, the patch applied by Danny didn't fix the problem on
> Hydra.  I didn't look very closely, but from a glance the failure looks
> the same:

Yeah, but it fixed the ghc-pkg one ("ghc-pkg couldn't decommit memory"
or something) - so we can be reasonably sure that the ghc package manager
provided the correct packages (and complete ones) now.

It's too bad that it didn't fix the big problem - I hoped it would...

>So, your analysis makes sense and is much appreciated, but the available
>evidence seems to suggest that something else might be going on.

ghc-pkg is saying:

Warning: This package indirectly depends on multiple versions of the same
package. This is highly likely to cause a compile failure.
package transformers-compat-0.5.1.4 requires transformers-0.5.2.0
package transformers-base-0.4.4 requires transformers-0.5.2.0
package primitive-0.6.3.0 requires transformers-0.5.2.0
package monad-control-1.0.1.0 requires transformers-0.5.2.0
package hspec-core-2.2.4 requires transformers-0.5.2.0
package hspec-2.2.4 requires transformers-0.5.2.0
package QuickCheck-2.10.1 requires transformers-0.5.2.0
package resourcet-1.1.7.5 requires transformers-0.5.2.0
package mtl-2.2.1 requires transformers-0.5.2.0
package mmorph-1.0.6 requires transformers-0.5.2.0
package exceptions-0.8.3 requires transformers-0.5.2.0

And we have

environment variable `GHC_PACKAGE_PATH' set to `
/gnu/store/34n70arzg4kc1yvckmz2sws38bbjxwsd-ghc-8.0.2/lib/ghc-8.0.2/package.conf.d:

/gnu/store/38m5h52cjr9mifpy1pjz84nvdqpkf0xa-ghc-lifted-base-0.2.3.8/lib/ghc-8.0.2/ghc-lifted-base-0.2.3.8.conf.d:
/gnu/store/kpz9xag4nmp3viwnxy3gvvfyj7050zsx-ghc-hspec-2.2.4/lib/ghc-8.0.2/ghc-hspec-2.2.4.conf.d:
/gnu/store/mgz1y98r11ys4mmskdq609r22w0f4cbz-ghc-transformers-base-0.4.4/lib/ghc-8.0.2/ghc-transformers-base-0.4.4.conf.d:

/gnu/store/bbhmvi5c51530happmcyqd7p2rfafyyi-ghc-monad-control-1.0.1.0/lib/ghc-8.0.2/ghc-monad-control-1.0.1.0.conf.d:
/gnu/store/sy3s3myih4wzc5m1g58411aam1hghrx8-ghc-transformers-compat-0.5.1.4/lib/ghc-8.0.2/ghc-transformers-compat-0.5.1.4.conf.d:

/gnu/store/smmh2iqqcdaxkzwr8dwkh9zqwb4nnx1q-ghc-mtl-2.2.1/lib/ghc-8.0.2/ghc-mtl-2.2.1.conf.d:
/gnu/store/pdgsa9gkvw9r8xw30gfg5502ysvdn0dz-ghc-mmorph-1.0.6/lib/ghc-8.0.2/ghc-mmorph-1.0.6.conf.d:
/gnu/store/an6vdcgn5366npr1kww3ycl1zv8q4vsd-ghc-exceptions-0.8.3/lib/ghc-8.0.2/ghc-exceptions-0.8.3.conf.d'

I don't see where the diamond depenency is...

But Timothy has a patchset that removes the customized "backported" ghc-transformer
package dependency since ghc-transformer is now part of ghc proper.

Its subject is "gnu: Remove Haskell packages provided by GHC".

Maybe that helps...