Can a Scala case object be used in a match case

Question

Can a Scala case object be used in a match case?

E.g. this does not work:

abstract class A
case object B extends A

object something {
  val b = B
  b match { case _:B => println("success") }
}

not found: type B
b match { case _:B => println("success") }
                 ^

Answer 1

Oops, seems that this also compiles:

abstract class A
case object B extends A

object something {
  val b = B
  b match { case B => println("success") }
}

Scala Fiddle: Can a Scala case object be used in a match case

Answer 2

You need to specify B.type:

object something {
  val b = B
  b match { case _:B.type => println("success") }
}