static const byte *UNRESOLVED_REFERENCE = (byte *) "internal error 1002: unresolved reference '$'";
static const byte *INVALID_GRAMMAR_ID = (byte *) "internal error 1003: invalid grammar object";
static const byte *INVALID_REGISTER_NAME = (byte *) "internal error 1004: invalid register name: '$'";
-static const byte *DUPLICATE_IDENTIFIER = (byte *) "internal error 1005: identifier '$' already defined";
+/*static const byte *DUPLICATE_IDENTIFIER = (byte *) "internal error 1005: identifier '$' already defined";*/
static const byte *UNREFERENCED_IDENTIFIER =(byte *) "internal error 1006: unreferenced identifier '$'";
static const byte *error_message = NULL; /* points to one of the error messages above */