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class Foo[t[x]<: Tuple2[Int, x]]
//
class MyPair[z](a: Int, b: z) extends Tuple2[Int, z](a,b)
object foo extends Foo[MyPair]
trait Monad[m[x <: Bound[x]], Bound[x], a] // TODO: variances!
trait ListMonad[a] extends Monad[List, [X] => Any, a] // Dotty difference: Any is not a legal argument for hk type.
trait MyOrdered[a]
trait MySet[x <: MyOrdered[x]]
trait SetMonad[a <: MyOrdered[a]] extends Monad[MySet, MyOrdered, a]
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