these 4 derivations will be built:
  /nix/store/3wrjpadnw9lxcd8b2lws9083zxfbx0zm-vendor-registry.drv
  /nix/store/y7g53d624y56px2ga6ls61fysvqr6qz1-vendor-cargo-deps.drv
  /nix/store/wjyhcadnnmym7f87234l96g1jpf6v3x2-harmonia-deps-3.3.0.drv
  /nix/store/cpi0qf4ppm7p8xw73s0k9w1g2pbx427q-harmonia-llvm-cov-3.3.0.drv