structuredAttrs is enabled

trying https://static.crates.io/crates/serial_test_derive/3.5.0/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   9436 100   9436   0      0 534.6k      0                              0