{ cabal, tagged, transformers, transformersCompat }:

cabal.mkDerivation (self: {
  pname = "contravariant";
  version = "0.4";
  sha256 = "1nqslc9vcx6v6c33fn7mvb1xhr33yl3ja92p788zx8z1drx9cqc3";
  buildDepends = [ tagged transformers transformersCompat ];
  meta = {
    homepage = "http://github.com/ekmett/contravariant/";
    description = "Haskell 98 contravariant functors";
    license = self.stdenv.lib.licenses.bsd3;
    platforms = self.ghc.meta.platforms;
    maintainers = [ self.stdenv.lib.maintainers.simons ];
  };
})