these 4 derivations will be built:
  /nix/store/31lzf1gm59k7wfgi6ygfay72airwlajk-Cargo.toml.drv
  /nix/store/li8n376fzq6nfwfjs7nhrmkrq8i7wp6w-source.drv
  /nix/store/aay69qh8hcw409dra7n3ihz2k8h38irj-harmonia-deps-3.1.0.drv
  /nix/store/1p2lc9d1ydrh0px4vaxf73y6yf81i5ma-harmonia-3.1.0.drv