Combine4
final class Combine4[Fx1 <: HasSignature, Fx2 <: HasSignature, Fx3 <: HasSignature, Fx4 <: HasSignature](val fx1: Fx1, val fx2: Fx2, val fx3: Fx3, val fx4: Fx4) extends Combine
class Combine
trait CanInterpret
trait HasSignature
trait Signature
class Object
trait Matchable
class Any