%Error-UNSUPPORTED: t/t_event_copy.v:100:13: Unsupported: assignment of event data type
                                           : ... In instance t
  100 |          e4 = e3;   
      |             ^
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_event_copy.v:101:13: Unsupported: assignment of event data type
                                           : ... In instance t
  101 |          e3 = e2;   
      |             ^
%Error: Exiting due to