these 2 derivations will be built:
  /nix/store/f2ysxzpd8qqy2jas9ak4d6y2a8wm9jlp-flake-inputs.drv
  /nix/store/rcjd4p6gfxf6lh52sgwarspnks3mw6jx-check-flake-inputs.drv