%Error: t/t_class_assign_bad.v:16:9: Assign RHS expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   16 |       c = 0;
      |         ^
%Error: t/t_class_assign_bad.v:17:9: Assign RHS expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   17 |       c = 1;
      |         ^
%Error: t/t_class_assign_bad.v:18:7: Function Argument expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   18 |       t(0);
      |       ^
%Error: t/t_class_assign_bad.v:19:7: Function Argument expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   19 |       t(1);
      |       ^
%Error: Exiting due to