these 7 derivations will be built:
  /nix/store/19c1v3dkf73i7gn1y4sd9clx0gs4naq1-source.drv
  /nix/store/yvv1x7fl30inarxd2mxh3y4vqf0afh1f-cargo-src-tokio-test-0.4.6.drv
  /nix/store/kws25xk3ybrpc6yfw1r996b19lfh5pyl-cargo-package-tokio-test-0.4.6.drv
  /nix/store/3srrks91n7gmrnk8m4a9sggdyniyislg-vendor-registry.drv
  /nix/store/vcnbcy80rgs9kk73f19r8sagxs1zkp7n-vendor-cargo-deps.drv
  /nix/store/px6c75yqqk0c0lv20795y82165zm6sq5-harmonia-deps-3.3.0.drv
  /nix/store/2d2xs2n5zbwpw1fxbp9aayx5aijp4fjf-harmonia-llvm-cov-3.3.0.drv