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, 4 insertions, 4 deletions

diff --git a/src/library/scala/collection/immutable/ListMap.scala b/src/library/scala/collection/immutable/ListMap.scala
index 53c99216c2..5fced699f3 100644
--- a/src/library/scala/collection/immutable/ListMap.scala
+++ b/src/library/scala/collection/immutable/ListMap.scala
@@ -42,8 +42,8 @@ object ListMap extends ImmutableMapFactory[ListMap] {
  *  @define mayNotTerminateInf
  *  @define willNotTerminateInf
  */
-@serializable @SerialVersionUID(301002838095710379L)
-class ListMap[A, +B] extends Map[A, B] with MapLike[A, B, ListMap[A, B]] {
+@SerialVersionUID(301002838095710379L)
+class ListMap[A, +B] extends Map[A, B] with MapLike[A, B, ListMap[A, B]] with Serializable {
 
   override def empty = ListMap.empty
 
@@ -123,9 +123,9 @@ class ListMap[A, +B] extends Map[A, B] with MapLike[A, B, ListMap[A, B]] {
 
   /** This class represents an entry in the `ListMap`.
    */
-  @serializable @SerialVersionUID(-6453056603889598734L)
+  @SerialVersionUID(-6453056603889598734L)
   protected class Node[B1 >: B](override protected val key: A,
-                                override protected val value: B1) extends ListMap[A, B1] {
+                                override protected val value: B1) extends ListMap[A, B1] with Serializable {
     /** Returns the number of mappings in this map.
      *
      *  @return number of mappings.