%Error: t/t_class_extends_bad.v:13:26: Multiple inheritance illegal on non-interface classes (IEEE 1800-2023 8.13)
   13 | class Cls extends Base1, Base2;
      |                          ^~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to