[issue27168] Yury isn't sure comprehensions and await interact correctly

Changes by Ned Deily : -- assignee: -> yselivanov ___ Python tracker ___ ___

[issue27168] Yury isn't sure comprehensions and await interact correctly

New submission from Nathaniel Smith: So he asked me to file a bug reminding him to write more unit tests. Interesting cases: async def f(): return (x for x in await g()) async def f(): return (await x for x in g()) (and ditto for [], {} comprehensions) -- components: