these 2 derivations will be built:
  /nix/store/iyawl56fz9s5h5wfmmw21s5kyl8xq0lq-flake-inputs.drv
  /nix/store/z5yigm9dwhdl6s6yz1c5xzj7n73a8y7p-check-flake-inputs.drv