[Nix-dev] Problem with installing haskell stuff

[Michael Alan Dorman]

Arseniy,

https://github.com/mdorman/nixpkgs/commit/5c08a5bf363344c953998523c986bf7726618e19
contains a change that fixed the problem for me.  Please know that
although it seems correct to me---and it does resolve the issue for
me---I might well be mistaken.

Mike.

Arseniy Seroka <ars.seroka at gmail.com> writes:
> Hello! I'm trying to update my haskell set of pkgs to commit
> 2862d272a606c6188c4c33dab60de4e0066ee194.
>
> I'm just doing `nix-env -i haskell-env -f $NIXPKGS_MASTER` as I was
> doing for more than a year.
>
> But I'm getting error `collision between
> `/nix/store/k18i1nm5hgnb82y9w2g9hmlwhk3szjld-ghc-8.0.1/lib/ghc-8.0.1/Cabal-1.24.0.0/Paths_Cabal.dyn_hi'
> and
> `/nix/store/0rwhbwsg9kmywgbrib2bs29p2hmi80za-Cabal-1.24.0.0/lib/ghc-8.0.1/Cabal-1.24.0.0/Paths_Cabal.dyn_hi'`
>
> What to do? How to fix that?