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, 1 insertions, 2 deletions

diff --git a/src/library/scala/collection/immutable/IndexedSeq.scala b/src/library/scala/collection/immutable/IndexedSeq.scala
index ba432517ff..f47f344a16 100644
--- a/src/library/scala/collection/immutable/IndexedSeq.scala
+++ b/src/library/scala/collection/immutable/IndexedSeq.scala
@@ -31,8 +31,7 @@ trait IndexedSeq[+A] extends Seq[A]
  *  @define Coll IndexedSeq
  */
 object IndexedSeq extends SeqFactory[IndexedSeq] {
-  @serializable
-  class Impl[A](buf: ArrayBuffer[A]) extends IndexedSeq[A] {
+  class Impl[A](buf: ArrayBuffer[A]) extends IndexedSeq[A] with Serializable {
     def length = buf.length
     def apply(idx: Int) = buf.apply(idx)
   }