Func<int, ILazyComonad<int>> CofreeAna = null;

            CofreeAna = n => new LazyCofree(n + 1, new Lazy(() => new IdentiyF(CofreeAna(n + 1))));

            var stream = CofreeAna(0);

            var t = stream.Next().Map(x => x * 2).Next().Next().Map(x => x * 2);