RECURSION_EXIST  2756 ext/mbstring/oniguruma/regcomp.c       r = RECURSION_EXIST;
RECURSION_EXIST  2767 ext/mbstring/oniguruma/regcomp.c     if (r == RECURSION_EXIST) {
RECURSION_EXIST  2794 ext/mbstring/oniguruma/regcomp.c       return (head == 0 ? RECURSION_EXIST : RECURSION_INFINITE);