I'm curious, when there is code like: case let matches: [][]regex::capture => defer regex::free_matches(matches); is there a gap between those two statem

I'm curious, when there is code like: case let matches: [][]regex::capture => defer regex::free_matches(matches); is there a gap between those two statements where memory for matches has been allocated in regex but won't be freed because the defer hasn't happened? For example, in Python I'd write: fd = None try: fd = os.open(...) (do stuff with fd) except Exception, err: (report err) finally: if fd is not None: os.close(fd) so that there is no gap. It might be tempting to write: try: fd = os.open(...) (do stuff with fd) except Exception, err: (report err) finally: os.close(fd) That works if (do stuff with fd) fails but blows up with fd uninitialized in os.close if os.open fails.