human
Solve the following python programming problem given the following code:
def testPassingAsArgument(self) : 
    def routine(conf) : 
        c = config.Configurator () 
        self.assertTrue ((c == conf)) 
d = defer.Deferred () 
    d.addCallback (d) 
    d.callback (config.Configurator ()) 

    
    

    Fix the buggy line: d.addCallback (d)
assistant
#Here is Python code to fix the buggy line: d.

d.addCallback (def routine()