<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def run_in_stack(func: Callable):
 """ Run the given function inside of a new stack resource. This ensures that any stack export calls will end up as output properties on the resulting stack component in the checkpoint file. This is meant for internal runtime use only and is used by the Python SDK entrypoint program. """

    try:
        Stack(func)

        # If an exception occurred when doing an RPC, this await will propegate the exception
        # to the main thread.
        await RPC_MANAGER.unhandled_exeception()
    finally:
        log.debug("Waiting for outstanding RPCs to complete")

        # Pump the event loop, giving all of the RPCs that we just queued up time to fully execute.
        # The asyncio scheduler does not expose a "yield" primitive, so this will have to do.
        #
        # Note that "asyncio.sleep(0)" is the blessed way to do this:
        # https://github.com/python/asyncio/issues/284#issuecomment-154180935
        await asyncio.sleep(0)

        # Wait for all outstanding RPCs to retire.
        await RPC_MANAGER.wait_for_outstanding_rpcs()

        # Asyncio event loops require that all outstanding tasks be completed by the time that the event
        # loop closes. If we're at this point and there are no outstanding RPCs, we should just cancel
        # all outstanding tasks.
        #
        # We will occasionally start tasks deliberately that we know will never complete. We must cancel
        # them before shutting down the event loop.
        log.debug("Canceling all outstanding tasks")
        for task in asyncio.Task.all_tasks():
            # Don't kill ourselves, that would be silly.
            if task == asyncio.Task.current_task():
                continue
            task.cancel()

        # Pump the event loop again. Task.cancel is delivered asynchronously to all running tasks
        # and each task needs to get scheduled in order to acknowledge the cancel and exit.
        await asyncio.sleep(0)

        # Once we get scheduled again, all tasks have exited and we're good to go.
        log.debug("run_in_stack completed")