Playground

import System;

public class Bag
{
	List<str> items = new List<str>();

	public:
		Add(str s) { items.Add(s); }

		Each() : Iterator<str>
		{
			loop (str s in items)
			{
				if (s == "stop")
					yield break;
				yield s;
			}
		}
}

Evens(i32 limit) : Iterator<i32>
{
	loop (i32 i = 0..limit)
		if (i % 2 == 0)
			yield i;
}

Main()
{
	Bag b = new Bag();
	b.Add("a");
	b.Add("b");
	b.Add("stop");
	b.Add("c");
	loop (str s in b.Each())
		Console.Write(s);
	Console.WriteLine();

	Iterator<i32> it = Evens(7);
	it.Next();
	Console.WriteLine(it.Current);
	loop (i32 e in it)
		Console.Write(e + " ");
	Console.WriteLine();
}