public static IStage <T0, T1> To <T0, T, T1>(this IStage <T0, T> stage1, IStage <T, T1> stage2)
{
Disposables stages = new Disposables();
stages.Add(stage1);
stages.Add(stage2);
stages.Add(stage1.Connect(stage2));
return(new CompositeStage <T0, T1>(stage1, stage2, stages));
}