public void Evaluate()
{
int cnt = 0;
IPortReceive pa = new Port <int> ();
IPortReceive pb = new Port <string> ();
var mr = new MultipleItemReceiver (Arbiter.FromHandler (() => { ++cnt; }), pa, pb);
try {
ITask res = null;
mr.Evaluate (new PortElement<int> (10), ref res);
Assert.Fail ("#1");
} catch (NotImplementedException) {}
}