these 6 derivations will be built:
  /nix/store/ijqczvwzifzswp2pycx6pfs772jvybbj-cargo-package-libc-0.2.190.drv
  /nix/store/2dnzzvjpwaywnw3f1sdinpx6mcf1q8ss-vendor-registry.drv
  /nix/store/474v6z2fw4jmxb4ql658cd1w9glpcjqv-vendor-cargo-deps.drv
  /nix/store/xgids30pfrwsxd77qai0id503dpfs6ja-source.drv
  /nix/store/n8a6qxrg2xa095626rlg0gkgpihm3lim-harmonia-deps-3.3.0.drv
  /nix/store/gllh990n8cpxwgnhrrfdxqrzzmf57242-harmonia-llvm-cov-3.3.0.drv