these 2 derivations will be built:
  /nix/store/wyj3g4h4b4s0viqqy0iskd47ans1mn2f-cargo-vendor-dir.drv
  /nix/store/ybpdrf7r1bb3bb9s6pzqpbhx42xkf7l7-horae-tests-0.1.0.drv