1cdef double f(const double a, const double b, const double c):
2    return a + b - c
3
4def test_non_const_as_const_arg():
5    """
6    >>> test_non_const_as_const_arg()
7    1.0
8    """
9    cdef double a = 1., b = 1., c = 1.
10    return f(a, b, c)
11