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If you add the following test to text_contextlib:
diff --git a/Lib/test/test_contextlib.py b/Lib/test/test_contextlib.py
--- a/Lib/test/test_contextlib.py
+++ b/Lib/test/test_contextlib.py
@@ -363,6 +363,8 @@ class TestContextDecorator(unittest.Test
 state.append(x)
 test('something')
 self.assertEqual(state, [1, 'something', 999])
+ test('something else')
+ self.assertEqual(state, [1, 'something', 999, 1, 'something else', 999])
 
 
 # This is needed to make the test actually run under regrtest.py!
You get the following error:
======================================================================
ERROR: test_contextmanager_as_decorator (test.test_contextlib.TestContextDecorator)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/antoine/cpython/32/Lib/contextlib.py", line 28, in __enter__
 return next(self.gen)
StopIteration
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/home/antoine/cpython/32/Lib/test/test_contextlib.py", line 366, in test_contextmanager_as_decorator
 test('something else')
 File "/home/antoine/cpython/32/Lib/contextlib.py", line 15, in inner
 with self:
 File "/home/antoine/cpython/32/Lib/contextlib.py", line 30, in __enter__
 raise RuntimeError("generator didn't yield")
RuntimeError: generator didn't yield
Clearly there is a problem in the API or its implementation, as in a function decorated with a context manager can only be invoked once! This isn't good...