def METHOD_NAME():
    from loopy.symbolic import aff_to_expr
    x = isl.Aff("[n] -> { [i0] -> [(-i0 + 2*floor((i0)/2))] }")
    from pymbolic import var
    i0 = var("i0")
    assert aff_to_expr(x) == (-1)*i0 + 2*(i0 // 2)