these 4 derivations will be built:
  /nix/store/pn38ivl62ph7c44c24fkrmha67890g8m-crate-serde_json-1.0.154.tar.gz.drv
  /nix/store/a2bmrjpbzrx6qiwhfz8nn6phahgslhdf-serde_json-1.0.154.drv
  /nix/store/vl4ji91wfr5yyn1f2g525a6dkq81agwk-cargo-vendor-dir.drv
  /nix/store/8ggk2bymingyf01npwml6198d2j33s94-nix-tree-0.1.0.drv