{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/b16aa9c85633ea49e19aee5e1678d082ce953a17.tar.gz";
  sha256 = "185p6112b35s2vgbswrmy5lwf09q27gzkpcfla6dbddmbk948d38";
}