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/mutable/History.scala b/src/library/scala/collection/mutable/History.scala
index 4a48f5c12c..1a3fa12c82 100644
--- a/src/library/scala/collection/mutable/History.scala
+++ b/src/library/scala/collection/mutable/History.scala
@@ -24,9 +24,8 @@ package mutable
  *  @tparam Evt   Type of events.
  *  @tparam Pub   Type of publishers.
  */
-@serializable
 @SerialVersionUID(5219213543849892588L)
-class History[Evt, Pub] extends Subscriber[Evt, Pub] with Iterable[(Pub, Evt)]
+class History[Evt, Pub] extends Subscriber[Evt, Pub] with Iterable[(Pub, Evt)] with Serializable
 {
   protected val log: Queue[(Pub, Evt)] = new Queue
   val maxHistory: Int = 1000