Yury Selivanov added the comment:
Attaching another patch. Please review (I plan to commit it tomorrow in 3.5
and 3.6 branches).
The patch affects generators machinery in the following way:
1. Generators behaviour isn't touched, the patch is only for 'async def'
coroutines.
2. Calling 'send()' or 'throw()' on a coroutine object after it is exhausted or
closed triggers a `RuntimeError("coroutine was already awaited")`
3. Calling 'close()' method on an exhausted or closed coroutines is a no-op.
'close()' can be called multiple times -- same as for generators.
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Added file: http://bugs.python.org/file41587/Issue25887_3.patch
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