human
Solve the following python programming problem given the following code:
@ staticmethod 
def WhenAny(ars) : 
    "Returns an AsyncResult representing the state of any AsyncResult passed in.
    The return value represents the state of the first AsyncResult to complete, or,
    if all fail, the last to fail.

    Args:
      ars - An enumerable of AsyncResults.
    Returns:
      An AsyncResult representing the state of the first AsyncResult to complete.
      The AsyncResult's value will be set to the value of the first result to
      complete, or, if all fail, the exception thrown by the last to fail.
    " 
    ready_ars = [ar for ar in ars if ar.ready ()] 
    if ready_ars : 
        return ar [0] 
ret = AsyncResult () 
    total = [len (ars)] 
    def complete(_ar) : 
        total [0] -= 1 
        if ((total [0] == 0) and _ar.exception) : 
            ret.set_exception (_ar.exception) 
else : 
            if ((not ret.ready ()) and _ar.successful ()) : 
                ret.set (_ar.value) 
for ar in ars : 
        ar.rawlink (complete) 
return ret 

    
    

    Fix the buggy line: return ar [0]
assistant
#Here is Python program to fix the buggy line: return ar [0]
.

return ready_ars [0]