these 6 derivations will be built:
  /nix/store/a7jq8xyf9mk1wbax01j8ih37bdk4vyx4-cargo-package-toml-1.1.8+spec-1.1.0.drv
  /nix/store/bjdpcrmj1p7my3ykf2imw1k76c6xi69g-vendor-registry.drv
  /nix/store/srcydig4dffyfbfsf8i6pz8ydx73i43a-vendor-cargo-deps.drv
  /nix/store/wqmkm2yf3mz6y9gl9kk7c8fas90s2970-source.drv
  /nix/store/95j1kjz1lp2zndcjb8yb77kgb9ijf8s4-harmonia-deps-3.3.0.drv
  /nix/store/4llidq5fch5i2bcrkr04bvc0g4q59x7q-harmonia-llvm-cov-3.3.0.drv