{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/13d33ba1a0ce6acd583dee6a8a2c7e7398fa30cd.tar.gz";
  sha256 = "0ggm1iv2ilxj39icqjx4dk9p3sbndvrf90v2qssz9h49xsv9w0j7";
}