Hack seq to add scalaz disjonction as operator which make a left when the list is empty

SeqDisjonction

import scalaz.{\/, \/- ,-\/}

implicit final class SeqOps[A](seq : Seq[A]) {
  def \/>[T](t : T) : T \/ Seq[A] =  if (seq.isEmpty) -\/(t) else \/-(seq)
} 

//usage
val right = Seq(1,2) \/> "Oh a nel!"
val left = Nil \/> "!#& a Nil !!"