structuredAttrs is enabled

trying https://static.crates.io/crates/proc-macro-error3/3.0.1/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  34705 100  34705   0      0 725.0k      0                              0