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Type Level OneOf
trait OneOf[Obj, Items]
object OneOf extends LowPriorityOneOf{
implicit def apply[Obj, Items](implicit oneOf: OneOf[Obj, Items]) = oneOf
implicit def left[L, R, Obj <: L] = new OneOf[Obj, L | R]{}
protected trait LowPriorityOneOf extends LowPriorityOneOf1{
implicit def right[L, R, Obj <: R] = new OneOf[Obj, L | R]{}
protected trait LowPriorityOneOf1{
implicit def recur[L, R, Obj](implicit oneOf: OneOf[Obj, R]) = new OneOf[Obj, L | R]{}
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