Jan <jan.cesp...@gmail.com> added the comment:
I've reproduced the problem also in 3.7 branch.
```
import asyncio
loop = asyncio.get_event_loop()
async def consumer():
while True:
await asyncio.sleep(0)
message = yield
print('received', message)
async def amain():
agenerator = consumer()
await agenerator.asend(None)
fa = asyncio.create_task(agenerator.asend('A'))
fb = asyncio.create_task(agenerator.asend('B'))
await fa
await fb
loop.run_until_complete(amain())
```
Output:
```
received A
received None
```
If the line `await asyncio.sleep(0)` is omitted the output is ok:
```
received A
received B
```
----------
nosy: +jan.cespivo
versions: +Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30773>
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