these 2 derivations will be built:
  /nix/store/z9g8m0l9vr8jvz98icbzr4zx2vr8aff6-flake-inputs.drv
  /nix/store/vbv5bvnxcq6fv8npqsw90w9kp6pdixxn-check-flake-inputs.drv