{ mkDerivation, base, containers, data-default-class, fetchurl }:
mkDerivation {
  pname = "data-default-instances-containers";
  version = "0.0.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base containers data-default-class ];
  description = "Default instances for types in containers";
  license = stdenv.lib.licenses.bsd3;
}