1 files changed, 0 insertions, 68 deletions
diff --git a/docs/examples/expressions/expressions-current.scala b/docs/examples/expressions/expressions-current.scala
deleted file mode 100644
index 660a417c11..0000000000
--- a/docs/examples/expressions/expressions-current.scala
+++ /dev/null
@@ -1,68 +0,0 @@
-package examples.expressions
-
-class Ref[a](var elem:a) {}
-
-abstract class Lang {
-  trait Visitor {
-    def caseNum(n: int): unit
-  }
-
-  abstract class Exp {
-    def visit(v: visitor): unit
-  }
-
-  type visitor <: Visitor
-
-  class Num(n: int) extends Exp {
-    def visit(v: visitor): unit = v.caseNum(n)
-  }
-
-  class Eval(result: Ref[int]) requires visitor extends Visitor {
-    def caseNum(n: int) = result.elem = n
-  }
-}
-
-abstract class Lang2 extends Lang {
-  trait Visitor2 extends Visitor {
-    def casePlus(left: Exp, right: Exp): unit
-  }
-
-  type visitor <: Visitor2
-
-  class Plus(l: Exp, r: Exp) extends Exp {
-    def visit(v: visitor): unit = v.casePlus(l, r)
-  }
-
-  //  class Eval2(result: Ref[int]): visitor extends Eval(result) with Visitor2 {
-  class Eval2(result: Ref[int]) requires visitor extends Eval(result) with Visitor2 {
-    def casePlus(l: Exp, r: Exp) =
-      result.elem = { l.visit(this); result.elem } + { r.visit(this); result.elem }
-  }
-
-  class Show2(result: Ref[String]) requires visitor extends Visitor2 {
-    def caseNum(n: int) = result.elem = n.toString()
-    def casePlus(l: Exp, r: Exp) =
-      result.elem =
-        "(" + { l.visit(this); result.elem } +
-        "+" + { r.visit(this); result.elem } + ")"
-  }
-}
-
-object Main {
-  def main(args: Array[String]): unit = {
-    //val l1 = new Lang { type visitor = Visitor } // not yet implemented
-    object l1 extends Lang { type visitor = Visitor } // workaround
-    val e1: l1.Exp = new l1.Num(42)
-    val iref = new Ref(0)
-    Console.println("eval: " + { e1.visit(new l1.Eval(iref)); iref.elem })
-
-    //val l2 = new Lang2 { type visitor = Visitor2 } // not yet implemented
-    object l2 extends Lang2 { type visitor = Visitor2 } // workaround
-    val e2: l2.Exp = new l2.Plus(new l2.Num(5), new l2.Num(37))
-    val sref = new Ref("")
-    Console.println("eval: " + { e2.visit(new l2.Eval2(iref)); iref.elem })
-    Console.println("show: " + { e2.visit(new l2.Show2(sref)); sref.elem })
-    e1.visit(new l1.Eval(iref))
-    e2.visit(new l2.Show2(sref))
-  }
-}