self: super:

let
  src = super.fetchFromGitHub {
      owner = "lspitzner";
      repo = "brittany";
      rev = "0.12.0.0";
      sha256 = "15mv10hwc8g68h0klhs1k6scxhm0rp548f8cygqsay0mry5hq98w";
  };

  doJailbreak = super.haskell.lib.doJailbreak;
in
{
  t_brittany = doJailbreak (super.haskellPackages.callCabal2nix "brittany"
    (builtins.fetchTarball {
      url = "http://hackage.haskell.org/package/brittany-0.12.0.0/brittany-0.12.0.0.tar.gz";
      sha256 = "01dd7rsjlsg39p9dr8x2jrmg4nn95157drqqk1czabv7izf2j29s";
    }) {});
  #haskellPackages = super.haskellPackages.override {
  #  overrides = hSelf: hSuper: {
  #    brittany = doJailbreak (hSuper.callCabal2nix "brittany" src {});
  #  };
  #};
}