human
Solve the following python programming problem given the following code:
@ gen_test 
def asyncSetUp(self) : 
    (listener, port) = bind_unused_port () 
    event = Event () 
    def accept_callback(conn, addr) : 
        self.server_stream = IOStream (conn) 
        self.addCleanup (self.server_stream.close) 
        event.set () 
add_accept_handler (listener, self) 
    self.client_stream = IOStream (socket.socket ()) 
    self.addCleanup (self.client_stream.close) 
    (yield [self.client_stream.connect (('127.0.0.1', port)), event.wait ()]) 
    self.io_loop.remove_handler (listener) 
    listener.close () 

    
    

    Fix the buggy line: add_accept_handler (listener, self)
assistant
#Here is Python program to fix the buggy line: add_accept_handler (listener, self)
.

add_accept_handler (listener, def accept_callback()