--- a/stage1_2/iec_flex.ll Tue Jul 29 13:39:40 2014 +0100
+++ b/stage1_2/iec_flex.ll Thu Jul 31 17:49:44 2014 +0100
@@ -1251,8 +1251,9 @@
/******************************************************/
-REF {if (get_opt_ref_operator()) return REF; else{REJECT;}} /* Keyword in IEC 61131-3 v3 */
-REF_TO {if (get_opt_ref_operator()) return REF_TO; else{REJECT;}} /* Keyword in IEC 61131-3 v3 */
+REF {if (get_opt_ref_operator()) return REF; else{REJECT;}} /* Keyword in IEC 61131-3 v3 */
+REF_TO {if (get_opt_ref_operator()) return REF_TO; else{REJECT;}} /* Keyword in IEC 61131-3 v3 */
+NULL {if (get_opt_ref_operator()) return NULL_token; else{REJECT;}} /* Keyword in IEC 61131-3 v3 */
EN return EN; /* Keyword */
ENO return ENO; /* Keyword */