[issue37398] contextlib.ContextDecorator decorating async functions

[John Belmonte]

John Belmonte <john at neggie.net> added the comment:

I was caught by this again, indirectly via @contextmanager.

If I define a non-async context manager using @contextmanager, I expect the decorator support to work on async functions.  I.e. the following should be equivalent:

```
async def foo():
    with non_async_cm:
        ...
```
```
@non_async_cm
async def foo():
    ...
```

Not only does the 2nd case not work, but the decorator is (effectively) silently ignored :(

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37398>
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