human
Solve the following python programming problem given the following code:
def test_futuredisposable_disposebeforeset() : 
    disposed = [False] 
    def dispose() : 
        disposed [0] = True 
d = SingleAssignmentDisposable () 
    dd = Disposable (dispose) 
    assert (not disposed [0]) 
    d.dispose () 
    assert (not disposed [0]) 
    d.disposable = dd 
    assert (dd.disposable == None) 
    assert disposed [0] 
    d.dispose () 
    assert disposed [0] 

    
    

    Fix the buggy line: assert (dd.disposable == None)
assistant
#Here is Python code to fix the buggy line: assert (dd.

assert (d.disposable == None)