human
Solve the following python programming problem given the following code:
def benchmark(scenario, operation, metric, num_samples) : 
    '
    Perform benchmarking of the operation within a scenario.

    :param IScenario scenario: A load scenario.
    :param IOperation operation: An operation to perform.
    :param IMetric metric: A quantity to measure.
    :param int num_samples: Number of samples to take.
    :return: Deferred firing with a tuple containing one list of
        benchmark samples and one scenario metrics result. See the
        ``sample`` function for the structure of the samples.  The
        scenario metrics are a dictionary containing information about
        the scenario.
    ' 
    scenario_established = scenario.start () 
    samples = [] 
    def collect_samples(ignored) : 
        collecting = Deferred () 
        task = cooperate ((sample (operation, metric, i).addCallback (samples.append) for i in range (num_samples))) 
        def stop_sampling_on_scenario_collapse(failure) : 
            task.stop () 
            collecting.errback (failure) 
scenario.maintained ().addErrback (stop_sampling_on_scenario_collapse) 
        task.whenDone ().addCallbacks ((lambda ignored : collecting.callback (samples)), (lambda ignored : None)) 
        return collecting 
benchmarking = scenario_established.addCallback (collect_samples) 
    def stop_scenario(samples) : 
        d = scenario.stop () 
        def combine_results(scenario_metrics) : 
            return (samples, scenario_metrics) 
d.addCallback (combine_results) 
        return d 
benchmarking.addCallbacks (scenario, bypass, errbackArgs = [scenario.stop]) 
    return benchmarking 

    
    

    Fix the buggy line: benchmarking.addCallbacks (scenario, bypass, errbackArgs = [scenario.stop])
assistant
#Here is Python program to fix the buggy line: benchmarking.

benchmarking.addCallbacks (def stop_scenario(, bypass, errbackArgs = [scenario.stop])