verilator/test_regress/t/t_event_class_fire.out

%Error: Internal Error: t/t_event_class_fire.v:10:5: ../V3Delayed.cpp:#: No active to handle FireEvent
                                                   : ... note: In instance '$unit::Cls'
   10 |     ->>e;
      |     ^~~
                        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.