these 4 derivations will be built:
  /nix/store/8xpp9w06gb574khsmaskxbxrv1mpw63l-crate-serde_json-1.0.154.tar.gz.drv
  /nix/store/755pf5xd82wjivjpd1a8syxqqzayb7an-serde_json-1.0.154.drv
  /nix/store/w3b7j4c7ibjhc7gxdxzhiq3jhz9vw1vq-cargo-vendor-dir.drv
  /nix/store/7msbnx8s7fnb55qqn78f0zh5m38q6qyp-nix-diff-0.1.0.drv