human
Solve the following python programming problem given the following code:
@ pytest.fixture (autouse = True) 
def fast_wait(monkeypatch) : 
    'Stub out gevent calls that take timeouts to wait briefly.

    In production one may want to wait a bit having no work to do to
    avoid spinning, but during testing this adds quite a bit of time.

    ' 
    old_sleep = gevent.sleep 
    old_joinall = gevent.joinall 
    old_killall = gevent.killall 
    def fast_wait(tm) : 
        return old_sleep (0.1) 
def fast_joinall(* args, **kwargs) : 
        if ('timeout' in kwargs) : 
            kwargs ['timeout'] = 0.1 
return old_joinall (* args, ** kwargs) 
def fast_killall(* args, **kwargs) : 
        if ('timeout' in kwargs) : 
            kwargs ['timeout'] = 0.1 
return old_killall (* args, ** kwargs) 
monkeypatch.setattr (gevent, 'sleep', old_killall) 
    monkeypatch.setattr (gevent, 'joinall', fast_joinall) 
    monkeypatch.setattr (gevent, 'killall', fast_killall) 

    
    

    Fix the buggy line: monkeypatch.setattr (gevent, 'sleep', old_killall)
assistant
#Here is Python program to fix the buggy line: monkeypatch.

monkeypatch.setattr (gevent, 'sleep', def fast_wait()