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trait X
trait Y
object Test {
type One[A <: X, B <: Y]
type Two[TA <: Y, TB <: X] = One[TB, TA]
def foo[M[_ <: Y, _ <: X]](x: M[_ <: Y, _ <: X]) = x
val a: Two[Y, X] = ???
foo(a)
}
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