mngr = these_callbacks.copy()
                        for callback in base_callbacks:
                            mngr.add_handler(callback, inherit=True)
                        base["callbacks"] = mngr
                    else:
                        # base_callbacks is also a manager
                        base["callbacks"] = base_callbacks.__class__(
                            parent_run_id=base_callbacks.parent_run_id
                            or these_callbacks.parent_run_id,
                            handlers=base_callbacks.handlers + these_callbacks.handlers,
                            inheritable_handlers=base_callbacks.inheritable_handlers
                            + these_callbacks.inheritable_handlers,
                            tags=list(set(base_callbacks.tags + these_callbacks.tags)),
                            inheritable_tags=list(
                                set(
                                    base_callbacks.inheritable_tags
                                    + these_callbacks.inheritable_tags
                                )
                            ),
                            metadata={
                                **base_callbacks.metadata,
                                **these_callbacks.metadata,
                            },
                        )
            else:
                base[key] = config[key] or base.get(key)  # type: ignore
    return base
[docs]def call_func_with_variable_args(
    func: Union[
        Callable[[Input], Output],
        Callable[[Input, RunnableConfig], Output],
        Callable[[Input, CallbackManagerForChainRun], Output],
        Callable[[Input, CallbackManagerForChainRun, RunnableConfig], Output],
    ],
    input: Input,
    config: RunnableConfig,
    run_manager: Optional[CallbackManagerForChainRun] = None,
    **kwargs: Any,
) -> Output:
    """Call function that may optionally accept a run_manager and/or config.
    Args:
        func (Union[Callable[[Input], Output],
          Callable[[Input, CallbackManagerForChainRun], Output],
          Callable[[Input, CallbackManagerForChainRun, RunnableConfig], Output]]):
           The function to call.