diff options
Diffstat (limited to 'test/files/pos')
-rw-r--r-- | test/files/pos/jesper.scala | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/files/pos/jesper.scala b/test/files/pos/jesper.scala new file mode 100644 index 0000000000..82623e4a24 --- /dev/null +++ b/test/files/pos/jesper.scala @@ -0,0 +1,30 @@ +object Pair { + sealed trait Pair { + type First + type Second <: Pair + } + + case class End() extends Pair { + type First = Nothing + type Second = End + + def ::[T](v : T) : Cons[T, End] = Cons(v, this) + } + + object End extends End() + + final case class Cons[T1, T2 <: Pair](_1 : T1, _2 : T2) extends Pair { + type First = T1 + type Second = T2 + + def ::[T](v : T) : Cons[T, Cons[T1, T2]] = Cons(v, this) + def find[T](implicit finder : Cons[T1, T2] => T) = finder(this) + } + + implicit def findFirst[T1, T2 <: Pair] : Cons[T1, T2] => T1 = (p : Cons[T1, T2]) => p._1 + implicit def findSecond[T, T1, T2 <: Pair](implicit finder : T2 => T) : Cons[T1, T2] => T = (p : Cons[T1, T2]) => finder(p._2) + + val p : Cons[Int, Cons[Boolean, End]] = 10 :: false :: End +// val x : Boolean = p.find[Boolean](findSecond(findFirst)) + val x2 : Boolean = p.find[Boolean] // Doesn't compile +} |