{ fetchurl }:
fetchurl {
url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/00012ce23948b9547fe6609d595109741e0f58cf.tar.gz";
sha256 = "1swgfx7b41jxq0pyws2wipdiyvy8nn6cp54yj3ip3r9l3gdv3f7b";
}