{ mkDerivation, base, fetchurl, ghc-prim, hashable }:
mkDerivation {
  pname = "unique";
  version = "0";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ghc-prim hashable ];
  homepage = "http://github.com/ekmett/unique/";
  description = "Fully concurrent unique identifiers";
  license = stdenv.lib.licenses.bsd3;
}