[issue2833] __exit__ silences the active exception

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Just found another funny example. This one fails also before r62847.

def except_yield():
    try:
        raise Exception("foo")
    except:
        yield 1
        raise
list(except_yield())

In Py3k (with or without r62487), we get "RuntimeError: No active
exception to reraise".
In Python 2.5, we get "TypeError: exceptions must be classes, instances,
or strings (deprecated), not NoneType".

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