<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def split(self):
 """Immediately stop the current interval and start a new interval that has a start_instant equivalent to the stop_interval of self"""

        self.stop()
        interval = Interval()
        interval._start_instant = self.stop_instant
        return interval