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, 3 deletions

diff --git a/test/files/scalap/caseClass/result.test b/test/files/scalap/caseClass/result.test
index eb1ad74295..9b65be4b48 100644
--- a/test/files/scalap/caseClass/result.test
+++ b/test/files/scalap/caseClass/result.test
@@ -1,5 +1,4 @@
-@scala.serializable
-case class CaseClass[A <: scala.Seq[scala.Int]](i : A, s : scala.Predef.String) extends java.lang.Object with scala.ScalaObject with scala.Product {
+case class CaseClass[A <: scala.Seq[scala.Int]](i : A, s : scala.Predef.String) extends java.lang.Object with scala.ScalaObject with scala.Product with scala.Serializable {
   val i : A = { /* compiled code */ }
   val s : scala.Predef.String = { /* compiled code */ }
   def foo : scala.Int = { /* compiled code */ }
@@ -11,4 +10,4 @@ case class CaseClass[A <: scala.Seq[scala.Int]](i : A, s : scala.Predef.String)
   override def productArity : scala.Int = { /* compiled code */ }
   override def productElement(x$1 : scala.Int) : scala.Any = { /* compiled code */ }
   override def canEqual(x$1 : scala.Any) : scala.Boolean = { /* compiled code */ }
-}
\ No newline at end of file
+}