these 4 derivations will be built:
  /nix/store/0lnha7gx452x59aqmpf49xgc2gbr01gz-Cargo.toml.drv
  /nix/store/irrr91l52cdvh41pyf00h4g0hmx9n05m-source.drv
  /nix/store/gnw83kkvwn427y0p4pjjw4qa74l9mchy-harmonia-deps-3.2.0.drv
  /nix/store/4xghk8inlz23ng3dxf3njy6wk4qnb0al-harmonia-3.2.0.drv