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, 1 deletions

diff --git a/src/library/scala/collection/mutable/ArraySeq.scala b/src/library/scala/collection/mutable/ArraySeq.scala
index 91bc864224..77dde422d9 100644
--- a/src/library/scala/collection/mutable/ArraySeq.scala
+++ b/src/library/scala/collection/mutable/ArraySeq.scala
@@ -39,12 +39,13 @@ import parallel.mutable.ParArray
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@serializable @SerialVersionUID(1530165946227428979L)
+@SerialVersionUID(1530165946227428979L)
 class ArraySeq[A](override val length: Int)
 extends IndexedSeq[A]
    with GenericTraversableTemplate[A, ArraySeq]
    with IndexedSeqOptimized[A, ArraySeq[A]]
    with Parallelizable[ParArray[A]]
+   with Serializable
 {
 
   override def companion: GenericCompanion[ArraySeq] = ArraySeq