these 4 derivations will be built:
  /nix/store/s9rnxn40hdwdhyrq8wiplc12bms16802-Cargo.toml.drv
  /nix/store/5b9rfa3dn66gv1p44zr0fky0rrbqyf5p-source.drv
  /nix/store/d2kxmykzfjav6rnb5k8w99n4z8h3vj9r-harmonia-deps-3.2.0.drv
  /nix/store/rvag88sdwg07w8cpmh0jkhkdiik4khj6-harmonia-clippy-3.2.0.drv