is_utf8_lead_byte 1520 string.c       		if (is_utf8_lead_byte(*p)) len++;
is_utf8_lead_byte 1530 string.c       	    if (is_utf8_lead_byte(*p)) len++;
is_utf8_lead_byte 2179 string.c       	    if (is_utf8_lead_byte(*p)) nth--;
is_utf8_lead_byte 2189 string.c       	if (is_utf8_lead_byte(*p)) {