{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/477d50a859be91a25b2fed6494d414044d7e71ab.tar.gz";
  sha256 = "0wzi2wgcp5ykwp4wrhcfdaxlbdzrmlgalparx3ap80q069c8fd0n";
}