haskell overlay

self: super:

let

  inherit (super) buildEnv;
  inherit (self) haskell;

in
{
  foo-env = buildEnv {
    name = "foo-env";
    paths = with self.haskellPackages; [
      (ghcWithPackages (hp: with hp; []))

      cabal-install
    ] ++ [
      cabal2nix
    ];
    meta.platforms = self.haskellPackages.ghc.meta.platforms;
  };
}