1 files changed, 0 insertions, 75 deletions
diff --git a/docs/examples/monads/simpleInterpreter.scala b/docs/examples/monads/simpleInterpreter.scala
deleted file mode 100644
index cde3a92dbb..0000000000
--- a/docs/examples/monads/simpleInterpreter.scala
+++ /dev/null
@@ -1,75 +0,0 @@
-object simpleInterpreter {
-
-  case class M[A](value: A) {
-    def bind[B](k: A => M[B]): M[B]     =  k(value);
-    def map[B](f: A => B): M[B]         =  bind(x => unitM(f(x)));
-    def flatMap[B](f: A => M[B]): M[B]  =  bind(f);
-  }
-
-  def unitM[A](a: A): M[A]          =  M(a);
-
-  def showM(m: M[Value]): String = m.value.toString();
-
-  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 {
-   override def toString() = "wrong"
-  } 
-  case class Num(n: Int) extends Value {
-    override def toString() = n.toString();
-  }
-  case class Fun(f: Value => M[Value]) extends Value {
-    override def toString() = "<function>"
-  }
-
-  type Environment = List[Pair[Name, Value]];
-
-  def lookup(x: Name, e: Environment): M[Value] = e match {
-    case List() => unitM(Wrong)
-    case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1)
-  }
-
-  def add(a: Value, b: Value): M[Value] = Pair(a, b) match {
-    case Pair(Num(m), Num(n)) => unitM(Num(m + n))
-    case _ => unitM(Wrong)
-  }
-
-  def apply(a: Value, b: Value): M[Value] = a match {
-    case Fun(k) => k(b)
-    case _ => unitM(Wrong)
-  }
-
-  def interp(t: Term, e: Environment): M[Value] = t match {
-    case Var(x) => lookup(x, e)
-    case Con(n) => unitM(Num(n))
-    case Add(l, r) => for (a <- interp(l, e);
-			   b <- interp(r, e);
-			   c <- add(a, b))
-                      yield c
-    case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e)))
-    case App(f, t) => for (a <- interp(f, e);
-			   b <- interp(t, e);
-			   c <- apply(a, b))
-		      yield c
-  }
-
-  def test(t: Term): String = 
-    showM(interp(t, List()));
-
-  val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11)));
-  val term1 = App(Con(1), Con(2));
-
-  def main(args: Array[String]) = {
-    System.out.println(test(term0));
-    System.out.println(test(term1));
-  }
-}
-