{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/f8773aba1736a7929a7262fdd6217be67f679c98.tar.gz";
  sha256 = "1flmp0r1isgp8mf85iwiwps6sa3wczb6k0zphprhnvbi2dzg9x87";
}