these 4 derivations will be built:
  /nix/store/marnbf5s4ymxbgj8vvg4nmc60b3gj6k9-Cargo.toml.drv
  /nix/store/xgaglwarcich9l61dnlgfyb6vzd5vw7b-source.drv
  /nix/store/83sbdixzyvf49l7vjj7lf6l8c02k0w4x-harmonia-deps-3.2.0.drv
  /nix/store/kdypsvzxjn3sfd3dawdk3is2p2hvqaqc-harmonia-3.2.0.drv