{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/3f7d88041d19d251bca6330e9008175875c0ed4a.tar.gz";
  sha256 = "18aymxbm7zhmh8jciq2p1hjdfwq5g31s5mmw3lqwaviigcisq22a";
}