these 5 derivations will be built:
  /nix/store/9j2y003f4298pyz4bbrcq99jdzkvsggv-vendor-registry.drv
  /nix/store/h092iqmmckq111y56zwlmlggg0cpy4pr-vendor-cargo-deps.drv
  /nix/store/wcm8ha7ibmspd9zfw6v548d12y3kb0y9-source.drv
  /nix/store/7gy4imwwbrb9xfh9vrcvqbpv1prvjk1b-herdr-eternal-deps-0.1.0.drv
  /nix/store/x5y03wgbm8dvsjd5ya1s4vmc4pc6pv42-herdr-eternal-test-0.1.0.drv