Teach the decompiler about the change

Author: OlivierBlanvillain

compiler/src/dotty/tools/dotc/printing/DecompilerPrinter.scala

@@ -57,7 +57,8 @@ class DecompilerPrinter(_ctx: Context) extends RefinedPrinter(_ctx) {
     def isSynthetic(parent: Tree): Boolean = {
       val sym = parent.symbol
       sym.maybeOwner == defn.ObjectClass ||
-      (sym == defn.ProductClass && impl.symbol.owner.is(Case))
+      (sym == defn.ProductClass && impl.symbol.owner.is(Case)) ||
+      (sym == defn.SerializableClass && impl.symbol.owner.is(Case))
     }
     val parents = impl.parents.filterNot(isSynthetic)
     val body = impl.body.filterNot(_.symbol.is(ParamAccessor))

library/src/scala/tasty/reflect/Printers.scala

@@ -596,6 +596,7 @@ trait Printers
           val parents1 = parents.filter {
             case IsTerm(Term.Apply(Term.Select(Term.New(tpt), _), _)) => !Types.JavaLangObject.unapply(tpt.tpe)
             case IsTypeTree(TypeTree.Select(Term.Select(Term.Ident("_root_"), "scala"), "Product")) => false
+            case IsTypeTree(TypeTree.Select(Term.Select(Term.Ident("_root_"), "scala"), "Serializable")) => false
             case _ => true
           }
           if (parents1.nonEmpty)