Given:

@contextmanager
def gen():
    print '__enter__'

    try:
        yield
    finally:
        print '__exit__'

with gen():
    raise StopIteration('body')


running the above results in:

__enter__
__exit__


I would have expected instead

__enter__
__exit__
Traceback (most recent call last):
  File "test25.py", line 53, in <module>
    raise StopIteration('body')
StopIteration: body


Note that doing:

with gen():
    raise GeneratorExit('body')

does the expected thing:

__enter__
__exit__
Traceback (most recent call last):
  File "test25.py", line 53, in <module>
    raise GeneratorExit('body')
GeneratorExit: body

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Attached code and results.

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Nick, I can't tell whether this is intentional without
rereading the specs. Can you?

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Attached diffs to test_with.py which adds tests for raising StopIteration (and GeneratorExit) from the body of a with-statement where the context manager is either a generator, or a class instance.

I think the correct behaviour is to return False from GeneratorContextManager.__exit__ if the thrown exception is a StopIteration, and the exact same instance is raised from self.gen.throw(). Diffs for this also attached.

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This looks good, although the second GeneratorExit test
looks redundant.  I went ahead and checked it in, however,
on the theory that more tests are better than fewer.  :)

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Realised I had a couple of typos in the comment added to contextlib. Fixed diff attached.

```
import contextlib

@contextlib.contextmanager
def foo():
    yield

class StartIrritation(StopIteration):
    pass


with foo():
    raise StartIrritation
```

apologies I meant to post this on a new ticket