these 5 derivations will be built:
  /nix/store/jadmdmfav81675azrli8r8f2955z08jq-vendor-registry.drv
  /nix/store/38varlbh28pqlvxxis106z77bsbpyv4r-vendor-cargo-deps.drv
  /nix/store/p445cmj8mnkwhydf4axv25n9r7bzaapb-source.drv
  /nix/store/wjhk4s846pz2bk3gcv10qj8yafl15z3v-harmonia-deps-3.1.0.drv
  /nix/store/q7wnkirp07cb5wd0wayp09a8ik4sn2i6-harmonia-llvm-cov-3.1.0.drv