these 6 derivations will be built:
  /nix/store/8nlivyrbi1hpd5cj3c0ffcbfpajpjz57-source.drv
  /nix/store/a7jq8xyf9mk1wbax01j8ih37bdk4vyx4-cargo-package-toml-1.1.8+spec-1.1.0.drv
  /nix/store/s0mwy8dgq04w1kkp2zh57h8s0wracdqd-vendor-registry.drv
  /nix/store/ck9mzm7cz5ifgab1ivxly0vls1m9i3nh-vendor-cargo-deps.drv
  /nix/store/0bh5bmqmwbq2d711pfa48bmb46nc6mkn-harmonia-deps-3.3.0.drv
  /nix/store/6v6z82m2g311xlsk6gzlfsp11ajl4zaw-harmonia-llvm-cov-3.3.0.drv