these 2 derivations will be built:
  /nix/store/mgnm49m64axnmnmw41hpx1nyjjl5s2mj-flake-inputs.drv
  /nix/store/j8g5q4qzpgzr7n2hkqb8bcgbwmr3a38l-check-flake-inputs.drv