%Error: t/t_class_assign_cond_bad.v:22:25: Incompatible types of operands of condition operator: CLASSREFDTYPE 'Cls1' and CLASSREFDTYPE 'Cls2'
                                         : ... note: In instance 't'
   22 |       c1 = (c1 != null) ? c1 : c2;
      |                         ^
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_class_assign_cond_bad.v:23:10: Assign RHS expects a CLASSREFDTYPE 'Cls1', got CLASSREFDTYPE 'Cls2'
                                         : ... note: In instance 't'
   23 |       c1 = (c1 != null) ? c2 : c2;
      |          ^
%Error: t/t_class_assign_cond_bad.v:24:25: Incompatible types of operands of condition operator: BASICDTYPE 'logic' and CLASSREFDTYPE 'Cls2'
                                         : ... note: In instance 't'
   24 |       c2 = (c1 == null) ? 1'b1 : c2;
      |                         ^
%Error: t/t_class_assign_cond_bad.v:24:10: Assign RHS expects a CLASSREFDTYPE 'Cls2', got BASICDTYPE 'logic'
                                         : ... note: In instance 't'
   24 |       c2 = (c1 == null) ? 1'b1 : c2;
      |          ^
%Error: t/t_class_assign_cond_bad.v:25:29: Incompatible types of operands of condition operator: CLASSREFDTYPE 'ExtCls1' and CLASSREFDTYPE 'Cls1'
                                         : ... note: In instance 't'
   25 |       ext_c1 = (c1 == null) ? ext_c1 : c1;
      |                             ^
%Error: Exiting due to