these 2 derivations will be built:
  /nix/store/b1c4z8r2dl5bnnyxsg7af5f7yacb5fk6-cargo-vendor-dir.drv
  /nix/store/h1rw3dz1icjfq9a2palz14sdgr4cc4mf-direnv-instant-1.3.0.drv