PEP 3114: rename .next() to .__next__() and add next() builtin.
diff --git a/Lib/test/test_extcall.py b/Lib/test/test_extcall.py
index 453f464..5525832 100644
--- a/Lib/test/test_extcall.py
+++ b/Lib/test/test_extcall.py
@@ -103,7 +103,7 @@
         self.c = 0
     def __iter__(self):
         return self
-    def next(self):
+    def __next__(self):
         if self.c == 4:
             raise StopIteration
         c = self.c