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, 3 insertions, 2 deletions

diff --git a/src/library/scala/collection/mutable/LinkedList.scala b/src/library/scala/collection/mutable/LinkedList.scala
index 538e2f1ba5..7be35c1326 100644
--- a/src/library/scala/collection/mutable/LinkedList.scala
+++ b/src/library/scala/collection/mutable/LinkedList.scala
@@ -37,10 +37,11 @@ import generic._
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@serializable @SerialVersionUID(-7308240733518833071L)
+@SerialVersionUID(-7308240733518833071L)
 class LinkedList[A]() extends LinearSeq[A]
                          with GenericTraversableTemplate[A, LinkedList]
-                         with LinkedListLike[A, LinkedList[A]] {
+                         with LinkedListLike[A, LinkedList[A]]
+                         with Serializable {
   next = this
 
   def this(elem: A, next: LinkedList[A]) {