these 2 derivations will be built:
  /nix/store/3kjmkss1cjrssfybxkq9g30hgfcg4p2w-flake-inputs.drv
  /nix/store/gx1rk0x0n5xp20paqhm8k2yalwp0d3h6-check-flake-inputs.drv