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ParseMe.scala

@@ -9,4 +9,8 @@ object ParseMe {
   def fromSet(i: Set[Set[Boolean]]) : Int = {
     5
   }
+
+  def emptySet(n: Tree) : Tree = {
+    Leaf()
+  }
 }

src/purescala/Trees.scala

@@ -73,6 +73,9 @@ object Trees {
 
   case class IntLiteral(value: Int) extends Literal[Int] 
   case class BooleanLiteral(value: Boolean) extends Literal[Boolean] 
+  case class StringLiteral(value: String) extends Literal[String]
+
+  case class CaseClass(classDef: CaseClassDef, args: Seq[Expr]) extends Expr
 
   /* Arithmetic */
   case class Plus(lhs: Expr, rhs: Expr) extends Expr