these 4 derivations will be built:
  /nix/store/mjjhzcllyf09mih083jai29ha0lk12x6-crate-serde_json-1.0.154.tar.gz.drv
  /nix/store/xasnrldha3drdclx3ihra5wqb16vnawm-serde_json-1.0.154.drv
  /nix/store/0502y8bhvsbcc3swz6xz8pn9zll48add-cargo-vendor-dir.drv
  /nix/store/20sq06x3mi26g8jdp1qlggd2j759zvd7-nix-tree-0.1.0.drv