these 2 derivations will be built:
  /nix/store/vfgkq4rvjkbz3fhyv2xpkdj0rsmjvjnx-flake-inputs.drv
  /nix/store/7xxqg6l7zb0appnmyhgjgwis5mbzjbi1-check-flake-inputs.drv