1 files changed, 0 insertions, 55 deletions
diff --git a/docs/examples/monads/directInterpreter.scala b/docs/examples/monads/directInterpreter.scala
deleted file mode 100644
index 06fffba8e2..0000000000
--- a/docs/examples/monads/directInterpreter.scala
+++ /dev/null
@@ -1,55 +0,0 @@
-object directInterpreter {
-
-  type Name = String;
-
-  trait Term;
-  case class Var(x: Name) extends Term;
-  case class Con(n: Int) extends Term;
-  case class Add(l: Term, r: Term) extends Term;
-  case class Lam(x: Name, body: Term) extends Term;
-  case class App(fun: Term, arg: Term) extends Term;
-
-  trait Value;
-  case object Wrong extends Value;
-  case class Num(n: Int) extends Value;
-  case class Fun(f: Value => Value)extends Value;
-
-  def showval(v: Value): String = v match {
-    case Wrong => "<wrong>"
-    case Num(n) => n.toString()
-    case Fun(f) => "<function>"
-  }
-
-  type Environment = List[Pair[Name, Value]];
-
-  def lookup(x: Name, e: Environment): Value = e match {
-    case List() => Wrong
-    case Pair(y, b) :: e1 => if (x == y) b else lookup(x, e1)
-  }
-
-  def add(a: Value, b: Value): Value = Pair(a, b) match {
-    case Pair(Num(m), Num(n)) => Num(m + n)
-    case _ => Wrong
-  }
-
-  def apply(a: Value, b: Value) = a match {
-    case Fun(k) => k(b)
-    case _ => Wrong
-  }
-
-  def interp(t: Term, e: Environment): Value = t match {
-    case Var(x) => lookup(x, e)
-    case Con(n) => Num(n)
-    case Add(l, r) => add(interp(l, e), interp(r, e))
-    case Lam(x, t) => Fun(a => interp(t, Pair(x, a) :: e))
-    case App(f, t) => apply(interp(f, e), interp(t, e))
-  }
-
-  def test(t: Term): String = 
-    showval(interp(t, List()));
-
-  val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11)));
-
-  def main(args: Array[String]) = 
-    System.out.println(test(term0));
-}