Context manager with class methods

[Gavin Panella]

Hi,

On Python 2.6 and 3.1 the following code works fine:

    class Foo(object):
    
        @classmethod
        def __enter__(cls):
            print("__enter__")
    
        @classmethod
        def __exit__(cls, exc_type, exc_value, traceback):
            print("__exit__")
    
    with Foo: pass

However, in 2.7 and 3.2 I get:

    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: __exit__

Is this a regression or a deliberate change? Off the top of my head I
can't think that this pattern is particularly useful, but it seems
like something that ought to work.

Gavin.
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