these 5 derivations will be built:
  /nix/store/4zl4flzjyzm7iqp22ibx9vjrr9cd9ncl-vendor-registry.drv
  /nix/store/x38a2wp2cafs57jnrahz81fmnvbdv0q1-vendor-cargo-deps.drv
  /nix/store/zz2sjjsiq8b0hg45sackh3gpzpl8a61j-source.drv
  /nix/store/3s4z785fkhc3sv0zn300ddlg0gi7wdgb-harmonia-deps-3.3.0.drv
  /nix/store/km3x7wmmvk4cxx07mshrqmhdjmz65nwx-harmonia-llvm-cov-3.3.0.drv