{ fetchurl }:
fetchurl {
url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/3a2febcad5a83b15dea74462890e3c48c13f55f1.tar.gz";
sha256 = "1z6mfk49hsxvcpv183wayirspx78xd1l0w42wf8mfyf0jh8grfff";
}