{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/e95fefd56a6b8de585e92cd34de4870e31fb7bc7.tar.gz";
  sha256 = "08pzxwsc4incrl5mv8572xs9332206p2cw2mynxks33n7nh98vmx";
}