   typealias _DisabledRangeIndex = _DisabledRangeIndex_
 }
 
-@transparent prefix public
+prefix public
 func ++ <T : _Incrementable> (inout x: T) -> T {
   x = x.successor()
   return x
 }
 
-@transparent postfix public
+postfix public
 func ++ <T : _Incrementable> (inout x: T) -> T {
   var ret = x
   x = x.successor()

public protocol BidirectionalIndexType 
  : ForwardIndexType, _BidirectionalIndexType {}

@transparent public
prefix func -- <T: _BidirectionalIndexType> (inout x: T) -> T {
  x = x.predecessor()
  return x
}


@transparent public
postfix func -- <T: _BidirectionalIndexType> (inout x: T) -> T {
  var ret = x
  x = x.predecessor()

  let d = start.distanceTo(end)
  return (n > 0 ? d < n : d > n) ? end : start.advancedBy(n)
}
