{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/85d71d5231521c70b961570dbbee953253fb379b.tar.gz";
  sha256 = "1mdp2ivnx7wvd63bq1li9gpsm5sv1s167crv1jjlqw578lbi8hv7";
}