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sealed trait Foo
sealed trait Bar extends Foo
sealed trait W[T >: Bar <: Foo]
case class X() extends W[Foo]
case class XX() extends W[Bar]
case class Y() extends W[Bar]
case class Z[T >: Bar <: Foo](
z1: W[T]
) extends W[T]
object Main {
// should fail for including X()
def f1(w: W[Bar]): Int = {
w match {
case X() => 1
case XX() => 2
case Y() => 1
case Z(z) => f1(z)
}
}
}
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