Hi Carlo,
> ghc-pkg check is full of errors
I don't think that "ghc-pkg check" ever succeeded in any ghc-wrapper
based installation.
> packages I installed no longer load in ghci
There is no obvious explanation for the errors you've described. As
random suggestion how you might obtain some additional insight, you
could add
ghcTestEnv = self.haskellPackages_ghc783.ghcWithPackages (p: with p; [
mtl
]);
to your ~/.nix-pkgs/config.nix and then run:
$ nix-env -p /tmp/haskell -iA ghcTestEnv
$ /tmp/haskell/ghci
Prelude> import Control.Monad.State.Lazy
Does that succeed? If it does, you try adding 'abcnotation', too, to see
whether that makes a difference.
Generally speaking, ghc-wrapper is fundamentally broken and many
discerning Nix hackers gave up using it entirely a long time ago
(precisely because of the kind of trouble that you seem to be having).
Best regards,
Peter
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