406 

   407 

   408 

   409 

   410 //************

   411 // Either

   412 val either1 : Either[Exception,Int] = Right(1)

   413 val either2: Either[Exception, Int] = Right(2)

   414 

   415 for{

   416   one <- either1

   417   two <- either2

   418 } yield one + two