%Error: t/t_class_ref_bad.v:15:11: Package/class for ':: reference' not found: 'ClsRigh'
                                 : ... Suggested alternative: 'ClsRight'
   15 |       s = ClsRigh::m_s;   
      |           ^~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to