{ fetchurl }:

fetchurl {
  url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/fd3fefef13b49cbcd9a08b46c2aa4ceb204de5e0.tar.gz";
  sha256 = "1dr4bqsisizw3qn9qxjpbk0rjri6s0gv9g9717cwfcixy940af2s";
}