these 5 derivations will be built:
  /nix/store/0lcs0l20fz4pil4zz5g977axnjqi1sri-source.drv
  /nix/store/lhknx1crzqw8dyc6drl7n1fcp9nxid6a-vendor-registry.drv
  /nix/store/8iryfzhfn59fwbgg5dcs966sca7jrr9m-vendor-cargo-deps.drv
  /nix/store/zyig246bpl2pcmg9bb10cqy34mw2nq3i-harmonia-deps-3.2.0.drv
  /nix/store/2f46p6wy87jirwxk0wsaif8d64manv1d-harmonia-llvm-cov-3.2.0.drv