{ fetchurl }:
fetchurl {
url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/70f02ad82349a18e1eff41eea4949be532486f7b.tar.gz";
sha256 = "1ajqybsl8hfzbhziww57zp9a8kgypj96ngxrargk916v3xpf3x15";
}