How to use the pynvim.util.format_exc_skip function in pynvim

def handler():
            try:
                fn(*args, **kwargs)
            except Exception as err:
                msg = ("error caught while executing async callback:\n"
                       "{!r}\n{}\n \nthe call was requested at\n{}"
                       .format(err, format_exc_skip(1), call_point))
                self._err_cb(msg)
                raise
        self._session.threadsafe_call(handler)

def _wrap_function(self, fn, sync, decode, nvim_bind, name, *args):
        if decode:
            args = walk(decode_if_bytes, args, decode)
        if nvim_bind is not None:
            args.insert(0, nvim_bind)
        try:
            return fn(*args)
        except Exception:
            if sync:
                msg = ("error caught in request handler '{} {}':\n{}"
                       .format(name, args, format_exc_skip(1)))
                raise ErrorResponse(msg)
            else:
                msg = ("error caught in async handler '{} {}'\n{}\n"
                       .format(name, args, format_exc_skip(1)))
                self._on_async_err(msg + "\n")

def filter_notification_cb(name, args):
            name = self._from_nvim(name)
            args = walk(self._from_nvim, args)
            try:
                notification_cb(name, args)
            except Exception:
                msg = ("error caught in notification handler '{} {}'\n{}\n\n"
                       .format(name, args, format_exc_skip(1)))
                self._err_cb(msg)
                raise

def filter_request_cb(name, args):
            name = self._from_nvim(name)
            args = walk(self._from_nvim, args)
            try:
                result = request_cb(name, args)
            except Exception:
                msg = ("error caught in request handler '{} {}'\n{}\n\n"
                       .format(name, args, format_exc_skip(1)))
                self._err_cb(msg)
                raise
            return walk(self._to_nvim, result)