[issue44518] Finalization of non-exhausted asynchronous generators is deferred

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Inlined asyncio.run(func()) is roughly equivalent to the following code:

loop = asyncio.new_event_loop()
loop.run_until_complete(func())
loop.run_until_complete(loop.shutdown_asyncgens())
loop.close()

If comment out loop.run_until_complete(loop.shutdown_asyncgens()) I get the following output:

finalize outer
Task was destroyed but it is pending!
task: <Task pending name='Task-2' coro=<<async_generator_athrow without __name__>()>>
END

No "finalize inner" but a warning about pending task instead.

On other hand, the following code

for _ in func().__await__(): pass

produces the output in expected order:

finalize inner
finalize outer
END

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44518>
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