this derivation will be built:
  /nix/store/gb8p8mdx9g7apkys0lpacfsq13x55x21-nix-update-1.16.0.drv
this path will be fetched (121.2 KiB download, 583.5 KiB unpacked):
  /nix/store/gsf3pf2i2cf8qfdzsq0wvczvn9wf4adk-nixpkgs-review-3.9.0