%Error: t/t_math_countbits2_bad.v:15:15: Expected numeric type, but got a 'logic$[0:3]' data type
                                       : ... note: In instance 't'
   15 |       count = $countones(my_vec);   
      |               ^~~~~~~~~~
        ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error: t/t_math_countbits2_bad.v:16:15: Expected numeric type, but got a 'logic$[0:3]' data type
                                       : ... note: In instance 't'
   16 |       count = $countbits(my_vec, '0);   
      |               ^~~~~~~~~~
%Error: t/t_math_countbits2_bad.v:17:14: Expected numeric type, but got a 'logic$[0:3]' data type
                                       : ... note: In instance 't'
   17 |       bool = $onehot(my_vec);   
      |              ^~~~~~~
%Error: t/t_math_countbits2_bad.v:18:14: Expected numeric type, but got a 'logic$[0:3]' data type
                                       : ... note: In instance 't'
   18 |       bool = $onehot0(my_vec);   
      |              ^~~~~~~~
%Error: Exiting due to