structuredAttrs is enabled

trying https://static.crates.io/crates/ark-serialize-derive/0.5.0/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   7477 100   7477   0      0 207.7k      0                              0