these 4 derivations will be built:
  /nix/store/qmm02sqhphnpg55n747wvc2ya957n8ac-vendor-registry.drv
  /nix/store/im4ac7pj7hwlbzd7bapzy5d9b1fp37hk-vendor-cargo-deps.drv
  /nix/store/sid1palcmgfpv6ja9n3yd7dkdvqdrfpb-harmonia-deps-3.3.0.drv
  /nix/store/y23hqrmz2z92hpw9c7syyf1733w7napi-harmonia-llvm-cov-3.3.0.drv