{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/197a82b352062bfeeefd4b62bfec19dd51a3728d.tar.gz";
  sha256 = "11c9a67j421vf6a7vvh280gsmssf49rxqnamdp1n9iljkhlfh5z1";
}