these 4 derivations will be built:
  /nix/store/0q6lyzzbvrsj1mvnq1xzh11hrcigv3rf-Cargo.toml.drv
  /nix/store/pcwz7dp4ykzpzq9zwgwwvrj0a9c76wxf-source.drv
  /nix/store/7frz7n9ildiywxck82845jj998x4gdb1-harmonia-deps-3.3.0.drv
  /nix/store/1bcbz8qv5j9bacfzcy5zczysq0b4nj2q-harmonia-3.3.0.drv