these 5 derivations will be built:
  /nix/store/vgdhdq3pb84x8765068z74yd2zkhymsp-vendor-registry.drv
  /nix/store/snvbf9fs1710jjh80pl3hqpl7hq91zxz-vendor-cargo-deps.drv
  /nix/store/z318c7rmc8ngy7zvz705c2lk6n2l9nmf-source.drv
  /nix/store/s4krrf85lk93bhdrf28mgxsfj7q5y3vv-harmonia-deps-3.3.0.drv
  /nix/store/vnm7spv8xjns8k5xbdln539gpglfpi0s-harmonia-llvm-cov-3.3.0.drv