anchor.diff:  
       static member Set var value =
           if var.Const then
  -            JavaScript.Console.Log("WebSharper UI.Next: invalid attempt to change value of a Var after calling SetFinal")
  +            printfn "WebSharper UI.Next: invalid attempt to change value of a Var after calling SetFinal"
           else
               Snap.MarkObsolete var.Snap
               var.Current <- value
  
positive.code:         var
  
      static member Create() =
          let mutable var = JavaScript.JS.Undefined
          var <-
              {
                  Const = false
  
negative.code: 
      [<MethodImpl(MethodImplOptions.NoInlining)>]
      static member Create v =
          let mutable var = jsNull()
          var <-
              {
                  Const = false
  