How would that work, keeping in mind that we support all the way back to 2.6?

Well, I didn't think about it. Sorry.

@brian-brazil, what do you think about Python version check inside decorator to exclude support for non-async syntax. Seems like it's not gonna affect backwards support. And will come really handy

I'm not sure how that'd work given that it's a syntax thing, and thus 2.6 would choke on it.

Yup, actually i was thinking about depending on version import of async compatible syntax. But it looks too complex and such case may be implemented easier with context manager as well.

c = Counter("errors_count")

async def foo_async():
    with c.count_exceptions():
        await sleep(1)
        raise Exception()

actually if someone really need the decorator then he can implement it by himself with a few lines of code