1 files changed, 9 insertions, 9 deletions
diff --git a/docs/examples/monads/callccInterpreter.scala b/docs/examples/monads/callccInterpreter.scala
index 5b556bd8fa..b5008c4c1b 100644
--- a/docs/examples/monads/callccInterpreter.scala
+++ b/docs/examples/monads/callccInterpreter.scala
@@ -14,7 +14,7 @@ object callccInterpreter {
 
   def showM(m: M[Value]): String = (m in id).toString();
 
-  def callCC[A](h: (A => M[A]) => M[A]) = 
+  def callCC[A](h: (A => M[A]) => M[A]) =
     M[A](c => h(a => M[A](d => c(a))) in c);
 
   type Name = String;
@@ -30,7 +30,7 @@ object callccInterpreter {
   trait Value;
   case object Wrong extends Value {
    override def toString() = "wrong"
-  } 
+  }
   case class Num(n: Int) extends Value {
     override def toString() = n.toString();
   }
@@ -38,15 +38,15 @@ object callccInterpreter {
     override def toString() = "<function>"
   }
 
-  type Environment = List[Pair[Name, Value]];
+  type Environment = List[Tuple2[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)
+    case (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))
+  def add(a: Value, b: Value): M[Value] = (a, b) match {
+    case (Num(m), Num(n)) => unitM(Num(m + n))
     case _ => unitM(Wrong)
   }
 
@@ -62,15 +62,15 @@ object callccInterpreter {
 			   b <- interp(r, e);
 			   c <- add(a, b))
                       yield c
-    case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e)))
+    case Lam(x, t) => unitM(Fun(a => interp(t, (x, a) :: e)))
     case App(f, t) => for (a <- interp(f, e);
 			   b <- interp(t, e);
 			   c <- apply(a, b))
 		      yield c
-    case Ccc(x, t) => callCC(k => interp(t, Pair(x, Fun(k)) :: e))
+    case Ccc(x, t) => callCC(k => interp(t, (x, Fun(k)) :: e))
   }
 
-  def test(t: Term): String = 
+  def test(t: Term): String =
     showM(interp(t, List()));
 
   val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11)));