anchor.diff:  //
   [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
   module Printf =
  +    open System.Diagnostics
       open Printf
   
       /// Print to a System.Text.StringBuilder, adding a newline.
  
positive.code:     open OptimizedClosures
  
      /// The empty string literal.
      let [<Literal>] empty = ""
  
      //
  
negative.code:                 System.Threading.Monitor.Exit lockObject
          else None
  
      /// Intercepts a value within a pipeline. The value is applied to a given
      /// function, then returned so it can continue through the pipeline.
      /// This function is primarily useful for debugging pipelines.
      [<CompiledName("Tap")>]
      let tap (action : 'T -> unit) (value : 'T) =
          action value
          value
  
  (*
  #if PROTO_COMPILER
      /// Returns the RuntimeTypeHandle of the specified type.
  