these 4 derivations will be built:
  /nix/store/fhci20n9b35qwnb9kj76v658cj71m2xj-Cargo.toml.drv
  /nix/store/0lazgfhdb0ca62943zprgxqmxvwqmr5k-source.drv
  /nix/store/8wnsqq6bsgffzqvjqczki1awxdrkp6af-harmonia-deps-3.1.0.drv
  /nix/store/z02zy7q17a671v2w9js6irqlrmk42akw-harmonia-3.1.0.drv