{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/b9a84642e423be98c8629aace783b78dc9f40439.tar.gz";
  sha256 = "08yj9vm62b40mwg51qwz6hz7ird7fmd08881wp2c7c2njqlaj84y";
}