structuredAttrs is enabled

trying https://static.crates.io/crates/matrix-pickle-derive/0.2.3/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   4178 100   4178   0      0 100.2k      0                              0