{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/59ba02b3424684458764210fa9e32ca08e516db2.tar.gz";
  sha256 = "0m4scz6b7xg7kisy6zlnw258pkfksmzzppw9gp0g6rdl0cxly239";
}