these 4 derivations will be built:
  /nix/store/bsy9d8jwb61z4phfp11d6cmi6rd21hn0-Cargo.toml.drv
  /nix/store/sfrvpz6cksgnr8cdl4x1xix679rslfg4-source.drv
  /nix/store/nvpxjfdij95dfz3j7gza2dxhzsi3iird-harmonia-deps-3.2.0.drv
  /nix/store/ij7ycndbk4kqil48xy438s605dkbkbf7-harmonia-3.2.0.drv