Add token literals to the lua parser

luprex/ext/eris-master/src/llex.h

@@ -27,7 +27,7 @@ enum RESERVED {
   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
   /* other terminal symbols */
   TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_DBCOLON, TK_EOS,
-  TK_NUMBER, TK_NAME, TK_STRING
+  TK_NUMBER, TK_NAME, TK_STRING, TK_TOKEN
 };
 
 /* number of reserved words */
@@ -37,6 +37,7 @@ enum RESERVED {
 typedef union {
   lua_Number r;
   TString *ts;
+  void *p;  /* for token (lightuserdata) literals */
 } SemInfo;  /* semantics information */