%Error: t/t_string_type_methods_bad.v:14: The 1 arguments passed to .len method does not match its requiring 0 arguments
                                        : ... In instance t
      i = s.len(0);  
            ^~~
%Error: t/t_string_type_methods_bad.v:15: The 0 arguments passed to .itoa method does not match its requiring 1 arguments
                                        : ... In instance t
      s.itoa;   
        ^~~~
%Error: t/t_string_type_methods_bad.v:16: The 3 arguments passed to .itoa method does not match its requiring 1 arguments
                                        : ... In instance t
      s.itoa(1,2,3);   
        ^~~~
%Error: Exiting due to
