these 4 derivations will be built:
  /nix/store/cglmfy5dli4smizj94gi3rfw8jlqr4s6-Cargo.toml.drv
  /nix/store/m72kpq312337njdw7lrna0brxljv68fk-source.drv
  /nix/store/dlgrd72x4kc4sqaxsv4vpv6jwz3wcbma-harmonia-deps-3.1.0.drv
  /nix/store/k47drjya2zwr7yvj8rkch997dqbj6d9q-harmonia-clippy-3.1.0.drv