these 2 derivations will be built:
  /nix/store/7f3wpcfx8k2z3z04r1rfzhjw5crng0rl-flake-inputs.drv
  /nix/store/v51n7z4c0cp6n8lf1l9qdlq1h3xqkzyr-check-flake-inputs.drv