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async generator aclose()/athrow() can be re-used after StopIteration #117894

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@graingert

Description

@graingert

Bug report

Bug description:

class MyExc(Exception):
    pass

import itertools

async def agenfn():
    for i in itertools.count():
        try:
            yield i
        except MyExc:
            pass


agen = agenfn()

try:
    agen.asend(None).send(None)
except StopIteration as e:
    print(f"{e.value=}")

athrow = agen.athrow(MyExc)

try:
    athrow.throw(MyExc)
except StopIteration as e:
    print(f"{e.value=}")

try:
    athrow.throw(MyExc)
except RuntimeError:
    print("good")
except StopIteration as e:
    print(f"bad {e.value=}")

outputs:

e.value=0
e.value=1
bad e.value=2

should output:

e.value=0
e.value=1
good

CPython versions tested on:

3.8, 3.9, 3.10, 3.11, 3.12, 3.13, CPython main branch

Operating systems tested on:

Linux

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    3.12only security fixes3.13bugs and security fixestype-bugAn unexpected behavior, bug, or error

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