start :: fn {
    a := 0
    for i := 0, i < 3, i = i + 1 {
        a = a + i
    }
    a <=> 3

    a = 0
    for i := 0, i <= 3, i = i + 1 {
        a = a + i
    }
    a <=> 6

    a = 0
    for i := 0, i < 3, i = i + 1 {
        for j := 0, j < 3, j = j + 1 {
            a = a + i * j
        }
    }
    a <=> 9
}