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

  0      0   0      0   0      0      0      0                              0
100   4178 100   4178   0      0  12202      0                              0
100   4178 100   4178   0      0  12201      0                              0
100   4178 100   4178   0      0  12199      0                              0