import sys

def test_python_iterator(depth):
    class I:
        def __init__(self, it):
            self.it = it
        def __iter__(self):
            return self
        def __next__(self):
            return next(self.it)
        next = __next__
    x = iter([1])
    for i in range(depth): x = I(x)
    next(x)

def test_python_call(depth):
    class X:
        def __call__(self, n):
            if n: return self(n-1)
            return None
    X()(depth)

def test_python_getitem(depth):
    class X:
        def __getitem__(self, n):
            if n: return self[n-1]
            return None
    X()[depth]


sys.setrecursionlimit(2**18)