%Warning-CASEX: t/t_case_x_bad.v:14:7: Suggest casez (with ?'s) in place of casex (with X's)
   14 |       casex (value)
      |       ^~~~~
                ... For warning description see https://verilator.org/warn/CASEX?v=latest
                ... Use "/* verilator lint_off CASEX */" and lint_on around source to disable this message.
%Warning-CASEWITHX: t/t_case_x_bad.v:19:9: Use of x/? constant in case statement, (perhaps intended casex/casez)
   19 |         4'b1xxx: $stop;
      |         ^~~~~~~
%Error: Exiting due to