# Lib/asyncio/base_events.py:592-599
for result, agen in zip(results, closing_agens):
    if isinstance(result, Exception):
        self.call_exception_handler({
            'message': f'an error occurred during closing of '
                        f'asynchronous generator {agen!r}',
            'exception': result,
            'asyncgen': agen
        })

import asyncio

async def agen():
    try:
        yield 1
    finally:
        raise asyncio.CancelledError("cancelled during cleanup")

caught = []

async def main():
    loop = asyncio.get_running_loop()
    loop.set_exception_handler(lambda loop, ctx: caught.append(ctx))
    g = agen()
    await g.__anext__()
    await loop.shutdown_asyncgens()

asyncio.run(main())
assert len(caught) == 1, f"Expected 1 handler call, got {len(caught)}"

if isinstance(result, (Exception, asyncio.CancelledError)):