these 5 derivations will be built:
  /nix/store/fna6y91a10knhrkrdcx2ljnrqxq0ahj8-vendor-registry.drv
  /nix/store/d8swv95a9d6nv2qii1f66rmx5zll9gzg-vendor-cargo-deps.drv
  /nix/store/l5fmrs6p070cwlfnfca4yi6np5avdi1d-source.drv
  /nix/store/d7j3biizknym2xjaq141718mlv5ar292-harmonia-deps-3.2.0.drv
  /nix/store/k5xbpaii0i2a8wljx80l9sw5vzjx6ixi-harmonia-llvm-cov-3.2.0.drv