%Error: t/t_past_bad.v:12:11: $past tick value must be constant (IEEE 1800-2017 16.9.3)
                            : ... In instance t
   12 |       if ($past(d, 0)) $stop;   
      |           ^~~~~
%Warning-TICKCOUNT: t/t_past_bad.v:13:20: $past tick value of 10000 may have a large performance cost
                                        : ... In instance t
   13 |       if ($past(d, 10000)) $stop;   
      |                    ^~~~~
                    ... Use "/* verilator lint_off TICKCOUNT */" and lint_on around source to disable this message.
%Error: Exiting due to