these 4 derivations will be built:
  /nix/store/8n2n5mnj68gxdwwy0kn33kmc6wvd0ngm-Cargo.toml.drv
  /nix/store/rjgd7zjl7aj8l4jfam6c28qbwyk9zdmx-source.drv
  /nix/store/695ynyxlzy9pdm3ynkl8f68v946q42mv-harmonia-deps-3.1.0.drv
  /nix/store/gvhid5x0hbvq9if2j9nlm2lvv7a6b1dc-harmonia-3.1.0.drv