these 4 derivations will be built:
  /nix/store/31lzf1gm59k7wfgi6ygfay72airwlajk-Cargo.toml.drv
  /nix/store/nzgx7670v0ghbb0wk18ly8k59jn9041d-source.drv
  /nix/store/l9g8mfvxmz7fn5dk150lv3j8i1jbf63n-harmonia-deps-3.1.0.drv
  /nix/store/qm2kw1my84j8srni4chbnylacf298d86-harmonia-3.1.0.drv