{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/179aac2faddbba8921029ca9851ad97bcaa79991.tar.gz";
  sha256 = "17cbapnvpasdpza2r1y7lf4y4b31k094jqsnx89dn8zwp8n862lv";
}