Index: gc_core/py/lang_core/gc_engine.py
==================================================================
--- gc_core/py/lang_core/gc_engine.py
+++ gc_core/py/lang_core/gc_engine.py
@@ -1112,10 +1112,19 @@
     if nSpace < nMin:
         return False
     if nMax is not None and nSpace > nMax:
         return False
     return True
+
+
+def g_token (lToken, i):
+    if i < 0:
+        return lToken[0]
+    if i >= len(lToken):
+        return lToken[-1]
+    return lToken[i]
+
 
 
 #### Disambiguator
 
 def g_select (dToken, sPattern, lDefault=None):