structuredAttrs is enabled

trying https://static.crates.io/crates/signature/3.0.0-rc.10/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  15754 100  15754   0      0 903.6k      0                              0