import (builtins.fetchTarball {
  url = "https://github.com/NixOS/nixpkgs-channels/archive/0a40a3999eb4d577418515da842a2622a64880c5.tar.gz";
  sha256 = "1j8gy2d61lmrp5gzi1a2jmb2v2pbk4b9666y8pf1pjg3jiqkzf7m";
}) {}