these 5 derivations will be built:
  /nix/store/7n05laxh5ichazvvb70c0jb00zh4lr5c-vendor-registry.drv
  /nix/store/7fb53s5b54wb7j6prdjbqphhsw4sz4v5-vendor-cargo-deps.drv
  /nix/store/ykskmp6bkhxmf7cjqndr71kqba5kdrg8-source.drv
  /nix/store/648s95778fnkx97sa2qqlmr3szbqvfid-harmonia-deps-3.3.0.drv
  /nix/store/53ki2wrikdfnisjrdd64b54v65s0yj8q-harmonia-llvm-cov-3.3.0.drv