--- a/progs/fun/fun_parser.sc	Fri Nov 29 18:59:32 2024 +0000
+++ b/progs/fun/fun_parser.sc	Mon Feb 03 12:31:28 2025 +0000
@@ -108,9 +108,9 @@
 
 
 // Abstract syntax trees for the Fun language
-abstract class Exp extends Serializable 
-abstract class BExp extends Serializable 
-abstract class Decl extends Serializable 
+abstract class Exp 
+abstract class BExp
+abstract class Decl
 
 case class Def(name: String, args: List[String], body: Exp) extends Decl
 case class Main(e: Exp) extends Decl