[issue36921] Deprecate yield from and @coroutine in asyncio

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

Was this supposed to deprecate using types.coroutine as a decorator as well? Because that's not clearly documented, which means people can still use it to make generator-based coroutines without async def.

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nosy: +josh.r

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<https://bugs.python.org/issue36921>
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