gen.py

import trio
import contextlib
from async_generator import aclosing


async def gen():
    for i in range(10):
        yield i


@contextlib.asynccontextmanager
async def get_gen():
    async with aclosing(gen()) as aiter:
        yield aiter


async def iterate_gen():
    async with get_gen() as aiter:
        async for item in aiter:
            yield item


async def eat_iterate():
    async with aclosing(iterate_gen()) as aiter:
        async for item in aiter:
            print(item)
            if item == 5:
                raise ValueError


trio.run(eat_iterate)

log.txt

Traceback (most recent call last):
  File "C:/Users/Matthew Einhorn/AppData/Roaming/JetBrains/PyCharm2020.2/scratches/scratch_13.py", line 14, in get_gen
    yield aiter
  File "C:/Users/Matthew Einhorn/AppData/Roaming/JetBrains/PyCharm2020.2/scratches/scratch_13.py", line 20, in iterate_gen
    yield item
GeneratorExit

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/Matthew Einhorn/AppData/Roaming/JetBrains/PyCharm2020.2/scratches/scratch_13.py", line 31, in <module>
    trio.run(eat_iterate)
  File "E:\Python\Python37\lib\site-packages\trio\_core\_run.py", line 1896, in run
    raise runner.main_task_outcome.error
  File "C:/Users/Matthew Einhorn/AppData/Roaming/JetBrains/PyCharm2020.2/scratches/scratch_13.py", line 28, in eat_iterate
    raise ValueError
  File "E:\Python\Python37\lib\site-packages\async_generator\_util.py", line 14, in __aexit__
    await self._aiter.aclose()
  File "C:/Users/Matthew Einhorn/AppData/Roaming/JetBrains/PyCharm2020.2/scratches/scratch_13.py", line 20, in iterate_gen
    yield item
  File "C:\Users\Matthew Einhorn\AppData\Local\Programs\Python\Python37\Lib\contextlib.py", line 189, in __aexit__
    raise RuntimeError("generator didn't stop after throw()")
RuntimeError: generator didn't stop after throw()
0
1
2
3
4
5

Process finished with exit code 1