tracking and tracing

src/main/java/carpet/script/value/LazyListValue.java

@@ -111,5 +111,10 @@ public abstract class LazyListValue extends ListValue implements Iterator<Value>
     {
         throw new InternalExpressionException("get element can only be obtained for regular lists");
     }
+    @Override
+    public String getTypeString()
+    {
+        return "iterator";
+    }
 
 }