Patch #1550800: make exec a function.
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index 1390e15..56c2449 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -2366,8 +2366,8 @@
         ...        '''>>> assert 1 < 2
         ...        '''
         ... \"""
-        >>> exec test_data in m1.__dict__
-        >>> exec test_data in m2.__dict__
+        >>> exec(test_data, m1.__dict__)
+        >>> exec(test_data, m2.__dict__)
         >>> m1.__dict__.update({"f2": m2._f, "g2": m2.g, "h2": m2.H})
 
         Tests that objects outside m1 are excluded: