{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/6515ef12bbcf8fbac87e12b4cb30b7eefa9ce9ce.tar.gz";
  sha256 = "0plf0kk0wj1lbmks09afyqrl70z0miwxzfk3zh7y2qiw3g5l1v0x";
}