these 5 derivations will be built:
  /nix/store/0slz1ckpz87wy06whb5p8s1x3fb5bhp8-vendor-registry.drv
  /nix/store/fcwx3gczr7fn72g11n5694fg81l0smkw-source.drv
  /nix/store/n2csi13vwcgsn16iaj9kzn1zhxpcqgvd-vendor-cargo-deps.drv
  /nix/store/n9xkk9vp2vpbsc8v4n28g63sc4d94jkd-herdr-eternal-deps-0.1.0.drv
  /nix/store/g1iza1nap2nm7ymc9p8y3886paicplr9-herdr-eternal-0.1.0.drv