%Error: t/t_class_assign_bad.v:25:9: Assign RHS expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   25 |       c = 0;
      |         ^
%Error: t/t_class_assign_bad.v:26:9: Assign RHS expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   26 |       c = 1;
      |         ^
%Error: t/t_class_assign_bad.v:27:9: Assign RHS expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   27 |       c = c2;
      |         ^
%Error: t/t_class_assign_bad.v:28:13: Assign RHS expects a CLASSREFDTYPE 'ClsExt'
                                    : ... In instance t
   28 |       c_ext = c;
      |             ^
%Error: t/t_class_assign_bad.v:30:7: Function Argument expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   30 |       t(0);
      |       ^
%Error: t/t_class_assign_bad.v:31:7: Function Argument expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   31 |       t(1);
      |       ^
%Error: t/t_class_assign_bad.v:32:7: Function Argument expects a CLASSREFDTYPE 'Cls'
                                   : ... In instance t
   32 |       t(c2);
      |       ^
%Error: t/t_class_assign_bad.v:33:7: Function Argument expects a CLASSREFDTYPE 'ClsExt'
                                   : ... In instance t
   33 |       f(c);
      |       ^
%Error: Exiting due to