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This is a work in progress and interfaces are subject to change.
To test:
python3.4 -m tornado.test.runtests --ioloop=tornado.platform.asyncio.AsyncIOLoop
python3.4 -m tornado.test.runtests --ioloop=tornado.platform.asyncio.AsyncIOMainLoop
(the tests log a few warnings with AsyncIOMainLoop because they leave some
unfinished callbacks on the event loop that fail when it resumes)
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