{ mkDerivation, base, criterion, fetchurl, groups, semigroupoids
, semigroups
}:
mkDerivation {
  pname = "monoid-extras";
  version = "0.4.2";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base groups semigroupoids semigroups ];
  benchmarkHaskellDepends = [ base criterion ];
  description = "Various extra monoid-related definitions and utilities";
  license = stdenv.lib.licenses.bsd3;
}