these 2 derivations will be built:
  /nix/store/nf5pv1gkhsys2rqcgbkm2kgvznggxg23-cargo-vendor-dir.drv
  /nix/store/cza5vkqdpx5sbbmxqszya59jckh2rkah-horae-clippy-0.1.0.drv