{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/ed2029405786768b4c0f8bdbbd7aee8193394eb9.tar.gz";
  sha256 = "0s6cbz7ylflpnqhxlpch48zb0l6xcp5501dj1qzvzldvwh46r8dc";
}