human
Solve the following python programming problem given the following code:
def test_returnValueNonLocalDeferred(self) : 
    '
        L{returnValue} will emit a non-local warning in the case where the
        L{inlineCallbacks}-decorated function has already yielded a Deferred
        and therefore moved its generator function along.
        ' 
    cause = Deferred () 
    @ inlineCallbacks 
    def inline() : 
        (yield cause) 
        self.mistakenMethod () 
        returnValue (2) 
effect = inline () 
    results = [] 
    effect.addCallback (cause.append) 
    self.assertEquals (results, []) 
    cause.callback (1) 
    self.assertMistakenMethodWarning (results) 

    
    

    Fix the buggy line: effect.addCallback (cause.append)
assistant
#Here is Python program to fix the buggy line: effect.

effect.addCallback (results.append)