{ mkDerivation, base, bytestring, fetchurl, silently, tasty
, tasty-golden, tasty-hunit
}:
mkDerivation {
  pname = "countable";
  version = "1.0";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ];
  testHaskellDepends = [
    base bytestring silently tasty tasty-golden tasty-hunit
  ];
  homepage = "https://github.com/AshleyYakeley/countable";
  description = "Countable, Searchable, Finite, Empty classes";
  license = stdenv.lib.licenses.bsd3;
}