%Error-UNSUPPORTED: t/t_semaphore_class.v:17:7: Unsupported: event controls in methods
                                              : ... In instance $unit::semaphore_cls
   17 |       wait (m_keys >= keyCount);
      |       ^~~~
                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error: Exiting due to