these 2 derivations will be built:
  /nix/store/7fzx3d2qpqg2svs9dzkfcas7clasbqbc-cargo-vendor-dir.drv
  /nix/store/v5qgvs7656c57f7xpbjjbhpwqzgavgla-horae-tests-0.1.0.drv