%Error: t/t_select_bad_tri.v:11:24: Selection index is constantly unknown or tristated: 1'bx
   11 |       if (in[(   (1'h0 / 1'b0)   )+:71] != 71'h0) $stop;
      |                        ^
%Error: Internal Error: t/t_select_bad_tri.v:11:24: ../V3Number.cpp:#: toUInt with 4-state 1'bx
                                                  : ... In instance t
   11 |       if (in[(   (1'h0 / 1'b0)   )+:71] != 71'h0) $stop;
      |                        ^