1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
trait Monad[T <: Bound[T], MyType[x <: Bound[x]], Bound[_]] {
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 flatMap[S <: RBound[S], RContainer[x <: RBound[x]], RBound[_],
Result[x <: RBound[x]] <: Monad[x, RContainer, RBound]]
(f: T => Result[S], foo: String): Result[S]
def flatMap[S <: Bound[S]]
(f: T => MyType[S], foo: Int): MyType[S]
}
trait Test {
def moo: MList[Int]
class MList[T](el: T) extends Monad[T, List, Any] { // error: does not conform to upper bound // error
def flatMap[S <: RBound[S], RContainer[x <: RBound[x]], RBound[_],
Result[x <: RBound[x]] <: Monad[x, RContainer, RBound]]
(f: T => Result[S]): Result[S] = sys.error("foo")
def flatMap[S <: RBound[S], RContainer[x <: RBound[x]], RBound[_],
Result[x <: RBound[x]] <: Monad[x, RContainer, RBound]]
(f: T => Result[S], foo: String): Result[S] = sys.error("foo")
def flatMap[S]
(f: T => List[S], foo: Int): List[S] = sys.error("foo")
}
val l: MList[String] = moo.flatMap[String, List, Any, MList]((x: Int) => new MList("String")) // error: does not conform to upper bound // error
}
|
