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/IndexedSeqLike.scala b/src/library/scala/collection/IndexedSeqLike.scala
index 1ad1da715d..a2044ae7ba 100644
--- a/src/library/scala/collection/IndexedSeqLike.scala
+++ b/src/library/scala/collection/IndexedSeqLike.scala
@@ -48,8 +48,8 @@ trait IndexedSeqLike[+A, +Repr] extends SeqLike[A, Repr] { self =>
    *  multiple `take`, `drop`, and `slice` operations on this iterator are bunched
    *  together for better efficiency.
    */
-  @serializable @SerialVersionUID(1756321872811029277L)
-  protected class Elements(start: Int, end: Int) extends BufferedIterator[A] {
+  @SerialVersionUID(1756321872811029277L)
+  protected class Elements(start: Int, end: Int) extends BufferedIterator[A] with Serializable {
     private var i = start
 
     def hasNext: Boolean = i < end