Deprecated the @serializable annotation, introd...

Deprecated the @serializable annotation, introduce a new trait
"scala.Serializable" which has to be extended instead (cross-platform).

Known issues:
 - Companion objects of serializable classes (including case classes) are automatically made serializable. However, they don't extend "Serializable" statically because of the known difficulty (should be done before typing, but hard).
 - Writing "case class C() extends Serializable" gives "error: trait Serializable is inherited twice"
 - Functions are serializable, but don't extend Serializable dynamically (could be fixed by making FunctionN Serializable - shouldn't we?)

Note that @SerialVersionUID continues to be an annotation; it generates
a static field, which is not possible otherwise in scala.

Review by dragos, extempore.

Question to dragos: in JavaPlatform.isMaybeBoxed, why is there a test
for "JavaSerializableClass"? Is that correct?

1 files changed, 2 insertions, 2 deletions

diff --git a/src/library/scala/collection/immutable/TreeMap.scala b/src/library/scala/collection/immutable/TreeMap.scala
index 07212f8f5c..d54c31dec8 100644
--- a/src/library/scala/collection/immutable/TreeMap.scala
+++ b/src/library/scala/collection/immutable/TreeMap.scala
@@ -42,12 +42,12 @@ object TreeMap extends ImmutableSortedMapFactory[TreeMap] {
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@serializable
 class TreeMap[A, +B](override val size: Int, t: RedBlack[A]#Tree[B])(implicit val ordering: Ordering[A])
   extends RedBlack[A]
      with SortedMap[A, B]
      with SortedMapLike[A, B, TreeMap[A, B]]
-     with MapLike[A, B, TreeMap[A, B]] {
+     with MapLike[A, B, TreeMap[A, B]]
+     with Serializable {
 
   def isSmaller(x: A, y: A) = ordering.lt(x, y)