structuredAttrs is enabled

trying https://static.crates.io/crates/const-serialize/0.8.0-alpha.0/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  21640 100  21640   0      0 645.3k      0                              0