human
Solve the following python programming problem given the following code:
@ test.skip_test ('kombu memory transport seems buggy with fanout queues as this test passes when you use rabbit (fake_rabbit=False)') 
def test_fanout_send_receive(self) : 
    'Test sending to a fanout exchange and consuming from 2 queues' 
    conn = self.rpc.create_connection () 
    conn2 = self.rpc.create_connection () 
    message = 'fanout test message' 
    self.received_message = None 
    def _callback(message) : 
        self.received_message = message 
conn.declare_fanout_consumer ('a_fanout', self) 
    conn2.declare_fanout_consumer ('a_fanout', _callback) 
    conn.fanout_send ('a_fanout', message) 
    conn.consume (limit = 1) 
    conn.close () 
    self.assertEqual (self.received_message, message) 
    self.received_message = None 
    conn2.consume (limit = 1) 
    conn2.close () 
    self.assertEqual (self.received_message, message) 

    
    

    Fix the buggy line: conn.declare_fanout_consumer ('a_fanout', self)
assistant
#Here is Python program to fix the buggy line: conn.

conn.declare_fanout_consumer ('a_fanout', _callback)