t / t4018 / cpp-skip-labelson commit grep: fix segfault under -P + PCRE2 <=10.30 + (*NO_JIT) (a25b908)
   1void RIGHT (void)
   2{
   3repeat:         // C++ comment
   4next:           /* C comment */
   5        do_something();
   6
   7        ChangeMe;
   8}