@gc
class Cache {
  n: Int
}

class Holder {
  cache: Cache
}

fn touch(c: Cache) -> Int {
  return c.n
}

fn balanced(h: Holder) -> Int {
  let c = h.cache
  return touch(c)
}

fn escaping(h: Holder) -> Cache {
  let c = h.cache
  return c
}

fn fresh() -> Int {
  let c = Cache { n: 1 }
  return touch(c)
}

fn replace(mut c: Cache) -> Int {
  return 0
}

fn clobbered(h: Holder) -> Int {
  let c = h.cache
  let n = replace(h.cache)
  return touch(c) + n
}