these 4 derivations will be built:
  /nix/store/6h9xx2p9kj8whrl0z3q6a9cg9ihj0fdb-crate-icalendar-0.17.15.tar.gz.drv
  /nix/store/x64n7ffqkaf2841nskwj4k4wy5jc5vc6-icalendar-0.17.15.drv
  /nix/store/78fv476h8a950nl8ifcdq7vvrcv3aipk-cargo-vendor-dir.drv
  /nix/store/0w3dnd680m7y7b2ibg26rcg0qn8wx439-citiesapp-frontend.drv