PEP 3114: rename .next() to .__next__() and add next() builtin.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index be3302b..6832fd9 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -369,7 +369,7 @@
  *    StopIteration extends Exception
  */
 SimpleExtendsException(PyExc_Exception, StopIteration,
-                       "Signal the end from iterator.next().");
+                       "Signal the end from iterator.__next__().");
 
 
 /*