fn main(): Unit = {
    Console.print("=== FBIP Allocation Test ===")
    let a = List.range(1, 100)
    let b = List.map(a, fn(x: Int): Int => x * 2)
    let c = List.filter(b, fn(x: Int): Bool => x > 50)
    let d = List.reverse(c)
    Console.print("Single owner chain done")
}