these 4 derivations will be built:
  /nix/store/6i2vb73sri234mclg5maq6966rr9xya5-Cargo.toml.drv
  /nix/store/yw84cl3d6r231x1rf2b9fgg23njn0knq-source.drv
  /nix/store/p1xq3cvyrii3z8clsbfxjlzl244ifnrn-harmonia-deps-3.2.0.drv
  /nix/store/6arrwxw09zalmsk1g5h1k3a6x2jmw3rf-harmonia-clippy-3.2.0.drv