{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/f20dd1d767313d653d6f0c6dd9a82f92d36ecb4c.tar.gz";
  sha256 = "1prawfbp6390dlgfvd3hxvgdab7rfkr88j35m5cbk3a4hxghkyj3";
}