these 2 derivations will be built:
  /nix/store/x5yd7mr5mabrhqazk4mn1cn2nn6z66yf-cargo-vendor-dir.drv
  /nix/store/s8h64shlqyxdgcwg4bv0sxsnjd0j34ah-horae-clippy-0.1.0.drv