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, 3 deletions

diff --git a/src/library/scala/collection/immutable/HashMap.scala b/src/library/scala/collection/immutable/HashMap.scala
index 977dd6d837..448210a330 100644
--- a/src/library/scala/collection/immutable/HashMap.scala
+++ b/src/library/scala/collection/immutable/HashMap.scala
@@ -35,8 +35,8 @@ import parallel.immutable.ParHashMap
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@serializable @SerialVersionUID(2L)
-class HashMap[A, +B] extends Map[A,B] with MapLike[A, B, HashMap[A, B]] with Parallelizable[ParHashMap[A, B]] {
+@SerialVersionUID(2L)
+class HashMap[A, +B] extends Map[A,B] with MapLike[A, B, HashMap[A, B]] with Parallelizable[ParHashMap[A, B]] with Serializable {
 
   override def size: Int = 0
 
@@ -620,7 +620,7 @@ time { mNew.iterator.foreach( p => ()) }
     } else true
   }
 
-  @serializable  @SerialVersionUID(2L) private class SerializationProxy[A,B](@transient private var orig: HashMap[A, B]) {
+  @SerialVersionUID(2L) private class SerializationProxy[A,B](@transient private var orig: HashMap[A, B]) extends Serializable {
     private def writeObject(out: java.io.ObjectOutputStream) {
       val s = orig.size
       out.writeInt(s)