these 6 derivations will be built:
  /nix/store/98d9ll5fdjd2svbvy0vlv2k3ggn02yyx-vendor-registry.drv
  /nix/store/02fscna9q8sbsmkz8jir4ca3xn1i49nc-vendor-cargo-deps.drv
  /nix/store/ln0hwrnj3zvw9gd4ql0ah9fr3fg02in2-Cargo.toml.drv
  /nix/store/v9f0qzjx9hyqvy3hacpsw2rh4cnhak44-source.drv
  /nix/store/v9s7wcvk61xn076lmb25n043sywxymyf-herdr-eternal-deps-0.1.0.drv
  /nix/store/zm20lasmaafs2w5cbch3f00ivy9ra2ar-herdr-eternal-test-0.1.0.drv