let
base =
fetchTarball "https://github.com/NixOS/nixpkgs/archive/f59f29659e1db1130f87936ef9f2a11a71b3a99c.zip";
overlay = self: super: {
};
in
args@{ overlays ? [], ... }:
import base (args // {
overlays = [overlay] ++ overlays;
})