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class Foo[A]
class Bar[B]
class Baz[C] extends Bar[C]
object Test1 {
type Alias[F[X] <: Foo[X]] = F[Int]
val x: Alias[Bar] = new Bar[Int] // error: Type argument [X0] => Bar[X0] does not conform to upper bound [X0] => Foo[X0]
def foo[F[X] <: Foo[X]] = ()
foo[Bar] // error: Type argument [X0] => Bar[X0] does not conform to upper bound [X0] => Foo[X0]
def bar[B[X] >: Bar[X]] = ()
bar[Bar] // ok
bar[Baz] // // error: Type argument [X0] => Baz[X0] does not conform to lower bound [X0] => Bar[X0]
bar[Foo] // error: Type argument [X0] => Foo[X0] does not conform to lower bound [X0] => Bar[X0]
def baz[B[X] >: Baz[X]] = ()
baz[Bar] //ok
baz[Baz] //ok
baz[Foo] // error: Type argument [X0] => Foo[X0] does not conform to lower bound [X0] => Baz[X0]
}
object Test2 {
type Alias[F[X] <: Foo[X]] = F[Int]
def foo[M[_[_]], A[_]]: M[A] = null.asInstanceOf[M[A]]
val x = foo[Alias, Bar] // error: Type argument Test2.Alias does not conform to upper bound [X0 <: [X0] => Any] -> Any
}
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