these 2 derivations will be built:
  /nix/store/phlajfhbi1pv08f5sc8wgxwfz8g3i9wg-cargo-vendor-dir.drv
  /nix/store/dmmhpgp93a3d3lzzd1av8xdhgyk68y3x-subportal-server-0.2.0.drv