# Pastebin TWOkeRtQ
  haskellPackages =
    (pkgs.callPackage <nixpkgs/pkgs/development/haskell-modules> {
      ghc =
        pkgs.haskell.packages.ghcHEAD.ghc.overrideDerivation (old: {
          patches = [];
          src = pkgs.fetchgit {
            url = git://git.haskell.org/ghc.git;
            rev = "0d213c18b6962bb65e2b3035a258dd3f5bf454dd";
            sha256 = "1z1zmsdqc3dgf1b3l68w8sv0g9kk3xkh7kk09557wkw9s65fn7v9";
          };
        });

      compilerConfig =
        pkgs.callPackage
          <nixpkgs/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix>
          {};
    }).override haskellOverrides;