these 4 derivations will be built:
  /nix/store/cmblf162k665w3bgkwwicn8r8v4jjj28-vendor-registry.drv
  /nix/store/r4vq9igaqpa9jwnh56dsqags18wb4p6n-vendor-cargo-deps.drv
  /nix/store/ln011nzx7kmkl7sj3fw1i6jc4rd1yj9i-harmonia-deps-3.1.0.drv
  /nix/store/7ymq0r84pipgm99rkvl2hb91hg1pgr8r-harmonia-llvm-cov-3.1.0.drv