{ mkDerivation, base, fetchurl, pretty }:
mkDerivation {
  pname = "type-spec";
  version = "0.3.0.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base pretty ];
  testHaskellDepends = [ base ];
  homepage = "https://github.com/sheyll/type-spec#readme";
  description = "Type Level Specification by Example";
  license = stdenv.lib.licenses.bsd3;
}