these 4 derivations will be built:
  /nix/store/h0qv9qkfx6m66ld8miypz15csiq22x3z-Cargo.toml.drv
  /nix/store/03sri018169sp3ijqdvxmkm6aww777sc-source.drv
  /nix/store/apsw54f0skyh0knchd018cn6m7n9lxlj-horae-checks-deps-0.1.0.drv
  /nix/store/fmbxv4dn2q21aczpbw81ac0qgasfjd2a-horae-tests-0.1.0.drv