human
Solve the following python programming problem given the following code:
def test_convert_is_robust_to_failures() : 
    foo = NetworkDispatcher ('foo') 
    def badfunc(* args, **kwargs) : 
        raise NotImplementedError () 
class A (object) : 
        pass 
class B (object) : 
        pass 
class C (object) : 
        pass 
discover.register ((A, B, C)) ((lambda x : 'int')) 
    foo.register (B, A, cost = 1.0) ((lambda x, **kwargs : 1)) 
    foo.register (C, B, cost = 1.0) (ws) 
    foo.register (C, A, cost = 10.0) ((lambda x, **kwargs : 2)) 
    with warnings.catch_warnings (record = True) as ws : 
        warnings.simplefilter ('always') 
        assert (foo (C, A ()) == 2) 
assert (len (ws) == 1) 
    w = ws [0].message 
    assert isinstance (w, FailedConversionWarning) 
    assert ('B -> C' in str (w)) 

    
    

    Fix the buggy line: foo.register (C, B, cost = 1.0) (ws)
assistant
#Here is Python program to fix the buggy line: foo.

foo.register (C, B, cost = 1.0) (def badfunc()