these 4 derivations will be built:
  /nix/store/50h1q15n367bf2grzn5k6ybxllfq9ca3-vendor-registry.drv
  /nix/store/p3p4isnc3amwqqybb63gba9srcaz78gh-vendor-cargo-deps.drv
  /nix/store/fnc2zd98zrakw6zh9b0lgsil0cyr6982-harmonia-deps-3.3.0.drv
  /nix/store/wqnzyy4x7ifzf9cladfhapfiqxmn6z23-harmonia-llvm-cov-3.3.0.drv