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trait Test1 {
trait Monad[MX] {
def x: MX
}
sealed abstract class Either[A,B]
case class Left[A,B](x: A) extends Either[A,B] with Monad[A]
case class Right[A,B](x: B) extends Either[A,B] with Monad[B]
def flatMap[FX,FY,M[FMX]<:Monad[FMX]](m: M[FX], f: FX => M[FY]): M[FY] = f(m.x)
println(flatMap(Left(1), {x: Int => Left(x)})) // error: Left does not conform to [X] -> Monad[X]
}
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