{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/3f0c3944190bf34286e4e80620fede11dd688f68.tar.gz";
  sha256 = "1i4k4wjm6w8hgwia1axwdr3ij0ckxh3ikc1f0nlk8sb0j3yrmxa6";
}