let
  pkgs = import (import ../nix/sources.nix).nixpkgs {};
in pkgs.fetchgit {
    url = "https://gitlab.haskell.org/ghc/ghc.git/";
    rev = "40c71c2cf38b4e134d81b7184a4d5e02949ae70c";
    sha256 = "04h9rcyzm9w3an1z00hjs062dp7dl19b8pkyxjsypr7a2i9dmvkb";
}