%Warning-WIDTH: t/t_const_bad.v:12: Unsized constant being X/Z extended to 68 bits: ?32?bxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                                  : ... In instance t
      if (68'hx_xxxxxxxx_xxxxxxxx !== 'dX) $stop;
                                      ^~~
                ... Use "/* verilator lint_off WIDTH */" and lint_on around source to disable this message.
%Warning-WIDTH: t/t_const_bad.v:13: Unsized constant being X/Z extended to 68 bits: ?32?bzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
                                  : ... In instance t
      if (68'hz_zzzzzzzz_zzzzzzzz !== 'dZ) $stop;
                                      ^~~
%Warning-WIDTH: t/t_const_bad.v:14: Unsized constant being X/Z extended to 68 bits: ?32?bzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
                                  : ... In instance t
      if (68'h?_????????_???????? !== 'd?) $stop;
                                      ^~~
%Error: Exiting due to
