{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/3ff0be5c9ee1ead33e07158b9a4a579fa2fb7a7f.tar.gz";
  sha256 = "15jqdjxyzcmg50zvl7szv6s2zi4k82as5wi6mkiwwpbdricg50pl";
}