program()
type
  File = record
    fd: Int
  end

  Cell#[T] = record
    held: ^T
  end

var
  files: Cell#[File]
  bytes: Cell#[Word8]
  f: File
  b: Word8

proc store#[T](target: ^Cell#[T]; value: ^T)
  target^.held := value
return

proc relay#[T](target: ^Cell#[T]; value: ^T)
  store(target, value)
return

begin
  store(@files, @f);
  relay(@bytes, @b);
  store(@files, cast(0u: ^File))
end.