these 5 derivations will be built:
  /nix/store/na2gmq7csvpphvl2758nprdr0ar1wzsh-source.drv
  /nix/store/qmblrzybjzyc7qis3bjy4s2pv4jwjxfd-vendor-registry.drv
  /nix/store/xn0v6dnbk9k5n8wgiw6d6awgzxpdkfs1-vendor-cargo-deps.drv
  /nix/store/3108y73nhip5l76mfyawdr8wxc0h5ggd-harmonia-deps-3.3.0.drv
  /nix/store/2qq7bj2l4a07m9kap0kg5z97v0lw20xx-harmonia-llvm-cov-3.3.0.drv