{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/9d50cd974714cdcfdaabd089923b571a66bae55a.tar.gz";
  sha256 = "1hv4pxp47850l36ci2ywmc75c95fvdqr3swz9qymy25gd6rbfs9f";
}