%Error: t/t_class_extends_rec_bad.v:7:31: Attempting to extend class 'RecursiveExtCls' from itself
    7 | class RecursiveExtCls extends RecursiveExtCls;
      |                               ^~~~~~~~~~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: Exiting due to