public void Test()
{
var i = 0;
var s = new EnumerableSequence <int>(new [] { 0, 1, 2, 3 }.Select(x => i++), 4);
var cached = new RunOnceSequence <int>(s);
var two = cached.Take(2).ToArray();
var all = cached.ToArray();
var all2 = cached.ToArray();
var result = s.ToArray();
var result2 = s.ToArray();
}
