these 2 derivations will be built:
  /nix/store/l6r6xxnai9q9alwkwrl9si35qjr2kw0c-cargo-vendor-dir.drv
  /nix/store/8yi47d9a4m1y40rn3v56vhlcjkqa4av9-horae-tests-0.1.0.drv