%Error: t/t_class_param_bad2.v:12:4: Class parameter type without default value is never given value (IEEE 1800-2023 6.20.1): 'PARAMB'
                                   : ... note: In instance 't'
   12 |    Cls c;   
      |    ^~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_class_param_bad2.v:7:18: Parameter type without default value is never given value (IEEE 1800-2023 6.20.1): 'PARAMB'
                                   : ... note: In instance 't'
    7 | class Cls #(type PARAMB);
      |                  ^~~~~~
%Error: Exiting due to