%Error-PINNOTFOUND: t/t_lint_pinnotfound_bad.v:12:13: Pin not found: 'x'
   12 | b b_inst1 (.x(1'b0));  
      |             ^
                    ... For error description see https://verilator.org/warn/PINNOTFOUND?v=latest
%Error-PINNOTFOUND: t/t_lint_pinnotfound_bad.v:13:6: Parameter pin not found: 'PX'
   13 | b #(.PX(1'b0)) b_inst2 ();  
      |      ^~
%Error: Exiting due to