structuredAttrs is enabled

trying https://static.crates.io/crates/ethereum_ssz_derive/0.10.4/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   9711 100   9711   0      0 211.4k      0                              0