{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/acac7d958b43c270c8411fc65895a531e496423f.tar.gz";
  sha256 = "15crmzdnj7lpbkhb44vhh7g0ghw0xj4cqkyqyg638dslijc5mjzd";
}