W606 false warning on consecutive await

[wwwjfy]

import asyncio


async def a():
    return 1


async def b():
    return a()


async def main():
    await (await b())


asyncio.run(main())

pycodestyle reports W606 'async' and 'await' are reserved keywords starting with Python 3.7, while this is not the case here.

Python 3.7

[scop]

Another probably related reproducer:

foo = (await
       bar())

The line break after await is significant, no warning is issued without it.