Index: src/org/python/core/AstList.java
===================================================================
--- src/org/python/core/AstList.java	(revision 6094)
+++ src/org/python/core/AstList.java	(working copy)
@@ -376,14 +376,14 @@
         List newList = data.subList(start, stop);
         if(step == 1) {
             newList = data.subList(start, stop);
-            return new AstList(newList);
+            return new AstList(newList, adapter);
         }
         int j = 0;
         for(int i = start; j < n; i += step) {
             newList.set(j, data.get(i));
             j++;
         }
-        return new AstList(newList);
+        return new AstList(newList, adapter);
     }
 
     public void insert(int index, PyObject o) {