cython

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cdef double f(const double a, const double b, const double c):
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    return a + b - c
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def test_non_const_as_const_arg():
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    """
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    >>> test_non_const_as_const_arg()
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    1.0
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    """
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    cdef double a = 1., b = 1., c = 1.
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    return f(a, b, c)
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