these 6 derivations will be built:
  /nix/store/0rq8h8b941wxjv4g60d8lay9j4a2qnzs-source.drv
  /nix/store/pdjkzgxm9543rfx86b37d6xk26nr5m0q-cargo-package-toml-1.1.8+spec-1.1.0.drv
  /nix/store/kkakd7yhb3k631ld9sin7mi3sg6h109m-vendor-registry.drv
  /nix/store/cf28z9crbwynagl5qdsbsc9xj7cgg55f-vendor-cargo-deps.drv
  /nix/store/1j2jhv8qj7fv1bxl1xvcjpcdirxqa3ws-harmonia-deps-3.3.0.drv
  /nix/store/mjndzwrwb3d4jgrrrp8rp11ycvm704ac-harmonia-llvm-cov-3.3.0.drv