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Diffstat (limited to 'tests/pos/spec-sealed.scala')
-rw-r--r-- | tests/pos/spec-sealed.scala | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/pos/spec-sealed.scala b/tests/pos/spec-sealed.scala new file mode 100644 index 000000000..d7ecfaaab --- /dev/null +++ b/tests/pos/spec-sealed.scala @@ -0,0 +1,32 @@ +sealed abstract class MyList[@specialized +A] { + def head: A + def tail: MyList[A] + + def ::[@specialized B >: A](x: B): MyList[B] = + new Cons[B](x, this) +} + +case object MyNil extends MyList[Nothing] { + def head = sys.error("nil") + def tail = sys.error("nil") +} + +case class Cons[@specialized a](private val hd: a, tl: MyList[a]) extends MyList[a] { + def head = hd + def tail = tl +} + +abstract class IntList extends MyList[Int] + +object Main extends App { + val xs = 1 :: 2 :: 3 :: MyNil + println(xs) +} + +/* +final class ConsI(hd1: Int, tl1: MyList[Int]) extends Cons[Int](hd1, tl1) { + override val hd = hd1 + override val tl = tl1 +} +*/ +//class IntCons(_hd: Int, _tl: MyList[Int]) extends Cons[Int](_hd, _tl) |