{ mkDerivation, base, fetchurl, hspec, silently }:
mkDerivation {
  pname = "nanospec";
  version = "0.2.1";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base ];
  testHaskellDepends = [ base hspec silently ];
  description = "A lightweight implementation of a subset of Hspec's API";
  license = stdenv.lib.licenses.mit;
}