anchor.diff:  //
   [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
   module Printf =
  +    open System.Diagnostics
       open Printf
   
       /// Print to a System.Text.StringBuilder, adding a newline.
  
positive.code:     let inline bprintfn (buf : System.Text.StringBuilder) fmt : 'T =
          kbprintf (fun _ -> buf.AppendLine () |> ignore) buf fmt
  
      // TODO
      // dprintf / dprintfn       // Print formatted string to DebugListeners
      // tprintf / tprintfn       // Print formatted string to TraceListeners
  
  
negative.code:     open OptimizedClosures
  
      /// The empty string literal.
      [<CompiledName("Empty")>]
      let [<Literal>] empty = ""
  
      //
  