these 5 derivations will be built:
  /nix/store/6ml2l3mchidvdgxjri37yb69s1yjq6w4-vendor-registry.drv
  /nix/store/9kp319ljzrnifzkpb587mrb4l0a3bhyc-vendor-cargo-deps.drv
  /nix/store/lg1404gd19y3xycxrcx78sk2wpyw9g86-source.drv
  /nix/store/pd005ns8f5phk8fp2a1ka0gqvsbcy9j4-harmonia-deps-3.3.0.drv
  /nix/store/dr8h3ng358c7i3w0jpxfvzljwzcg9k3x-harmonia-llvm-cov-3.3.0.drv