these 4 derivations will be built:
  /nix/store/wy6ssw3jfnqxzrl4563k557a7iahhkkm-crate-icalendar-0.17.17.tar.gz.drv
  /nix/store/mifxfvzc5ka6kp9dq0wfdm7h6n0w0l2g-icalendar-0.17.17.drv
  /nix/store/4lpk92ajrxcfh6nisqy99dwcflhasqv7-cargo-vendor-dir.drv
  /nix/store/3ng79bndphhi4wjmi7zq5l7cy8dfdl5b-citiesapp-frontend.drv