these 3 derivations will be built:
  /nix/store/zz52l5qsh37hhzx5mqhy6m724rsqxrcf-serde_json-1.0.154.drv
  /nix/store/c4z942xz7mgpwbi98r0ng8aplwgn7dsh-cargo-vendor-dir.drv
  /nix/store/z32d1gb7dk77shgsmglvsnyda21wdzz2-bob-0.1.0.drv