{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/b09de4efc2a385cf3407072c24c21ec8ec774a03.tar.gz";
  sha256 = "0yy3k5wgi9zgwz51gxakhlalwac59fkh0flydf334msrxlc3xf9z";
}