anchor.diff:  open IronJS.Support.CustomOperators
   
   open System
  +open System.Dynamic
   open System.Reflection
   open System.Reflection.Emit
   open System.Runtime.InteropServices
  
positive.code:         | _ -> x.Clr
  
      member x.Unbox<'a>() = x.ClrBoxed :?> 'a
  
      static member Box(value:CO) =
        let mutable box = BV()
  
negative.code:     x.RaiseError(x.Prototypes.ReferenceError, message)
  
  and CO = CommonObject
  and [<AllowNullLiteral>] CommonObject =
    inherit DynamicObject
  
    val Env : Environment
    val mutable Prototype : CO
  