Return either completion information or a call signature for
        the function definition that we are on currently.

def in_function_call(self):
        """Return either completion information or a call signature for
        the function definition that we are on currently."""
        #The last thing to do before we can form completions etc. is perform
        #a real-time update of the in-memory versions of the modules.
        if settings.real_time_update:
            cache.rt.update(self._user_context)

        return self._evaluator.in_function_call()