these 5 derivations will be built:
  /nix/store/7x37cfp0ssaimd64ri8zgnccbkhsb03z-vendor-registry.drv
  /nix/store/jv13zsgyvvk2bi0j8r858wzv36pyyhas-source.drv
  /nix/store/s77prh2205r91h5l5nm069f7pniw5cmb-vendor-cargo-deps.drv
  /nix/store/8ir8jk4sfw7dnyz0b9y88swmms8gkcf6-harmonia-deps-3.2.0.drv
  /nix/store/z8vk5jylj6rmlpnnm87j2kh6p87jyqx1-harmonia-llvm-cov-3.2.0.drv