these 2 derivations will be built:
  /nix/store/irwkjnpdzz9f8binrg7i6avvyqc0vg0f-flake-inputs.drv
  /nix/store/g9k5vf86g9n8bsbhzl3zqg28cj4m5lsn-check-flake-inputs.drv