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, 2 deletions

diff --git a/src/compiler/scala/tools/nsc/transform/UnCurry.scala b/src/compiler/scala/tools/nsc/transform/UnCurry.scala
index ddc14cd95b..0d87ba1203 100644
--- a/src/compiler/scala/tools/nsc/transform/UnCurry.scala
+++ b/src/compiler/scala/tools/nsc/transform/UnCurry.scala
@@ -327,8 +327,8 @@ abstract class UnCurry extends InfoTransform with TypingTransformers with ast.Tr
         val (formals, restpe) = (targs.init, targs.last)
         val anonClass = owner newAnonymousFunctionClass fun.pos setFlag (FINAL | SYNTHETIC | inConstructorFlag)
         def parents =
-          if (isFunctionType(fun.tpe)) List(abstractFunctionForFunctionType(fun.tpe))
-          else List(ObjectClass.tpe, fun.tpe)
+          if (isFunctionType(fun.tpe)) List(abstractFunctionForFunctionType(fun.tpe), SerializableClass.tpe)
+          else List(ObjectClass.tpe, fun.tpe, SerializableClass.tpe)
 
         anonClass setInfo ClassInfoType(parents, new Scope, anonClass)
         val applyMethod = anonClass.newMethod(fun.pos, nme.apply) setFlag FINAL