structuredAttrs is enabled

trying https://static.crates.io/crates/tree_hash_derive/0.12.1/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   4669 100   4669   0      0 166.1k      0                              0