these 5 derivations will be built:
  /nix/store/f55kc8y703f766izvpg3297hx3w5r8sx-source.drv
  /nix/store/k64vdawisf59hgf23psxynls8n8xw50y-vendor-registry.drv
  /nix/store/nsdsnym146a23j4mmz7x8icw5bcrf5h1-vendor-cargo-deps.drv
  /nix/store/ajhgs2l2rxw9ikrp3fzgx37vaibzsvx4-harmonia-deps-3.2.0.drv
  /nix/store/qzz8m2c1wlpcn8hi8nwjgnd88qhvpvmv-harmonia-llvm-cov-3.2.0.drv