human
Solve the following python programming problem given the following code:
@ dec.slow 
def test_len(self) : 
    class Foo () : 
        def __len__(self) : 
            return 10 
a = Foo () 
    res = inline_tools.inline ('return_val = a.len();', ['a']) 
    assert_equal (a, len (a)) 

    
    

    Fix the buggy line: assert_equal (a, len (a))
assistant
#Here is Python program to fix the buggy line: assert_equal (a, len (a))
.

assert_equal (res, len (a))