these 4 derivations will be built:
  /nix/store/hwsf58ad8ijqfmyq9fs9bbvndvj2b1xx-Cargo.toml.drv
  /nix/store/7vmp8malm6hbgfkprpwynav0r59p83db-source.drv
  /nix/store/zqb5hkh7kmdkir335kf20ljnr7hpkwkd-harmonia-deps-3.3.0.drv
  /nix/store/x0wrnpip7dx3kyqrkwbjkzhxkq6fc3a6-harmonia-3.3.0.drv