{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/4db96602103463d72e59ce214d0da8af35405f07.tar.gz";
  sha256 = "14r7m3555ngfafk2wgdj4lnv7zzajcc4j4fiws4k3kr3xwbrwrxr";
}