class Item {
  n: Int
}

class Bag {
  item: Item
}

fn stash(take it: Item) -> Int {
  return 0
}

fn build(take a: Item, take b: Item, take c: Item) -> Bag {
  let held = a
  let bag = Bag { item: b }
  let n = stash(c)
  return bag
}