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trait Monad[T <: Bound[T], MyType[x <: Bound[x]], Bound[_]] {
def map[S <: Bound[S]](f: T => S): MyType[S]
def flatMap[S <: RBound[S], RContainer[x <: RBound[x]], RBound[_],
Result[x <: RBound[x]] <: Monad[x, RContainer, RBound]]
(f: T => Result[S]): Result[S]
def filter(p: T => Boolean): MyType[T]
}
class Set[T <: Ordered[T]] extends Monad[T, Set, Ordered] {
def map[S <: Ordered[S]](f: T => S): Set[S] = error("TODO")
def flatMap[S <: RBound[S], RContainer[x <: RBound[x]], RBound[_],
Result[x <: RBound[x]] <: Monad[x, RContainer, RBound]]
(f: T => Result[S]): Result[S] = error("TODO")
def filter(p: T => Boolean): Set[T] = error("TODO")
}
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