cython

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# ticket: t544
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def count(i=[0]):
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    i[0] += 1
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    return i[0]
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def test(x):
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    """
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    >>> def py_count(i=[0]):
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    ...     i[0] += 1
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    ...     return i[0]
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    >>> 1 in (py_count(), py_count(), py_count(), py_count())
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    True
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    >>> 4 in (py_count(), py_count(), py_count(), py_count())
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    False
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    >>> 12 in (py_count(), py_count(), py_count(), py_count())
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    True
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    >>> test(1)
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    True
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    >>> test(4)
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    False
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    >>> test(12)
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    True
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    """
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    return x in (count(), count(), count(), count())
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