anchor.diff:          let buf : string[] = Array.zeroCreate n
           let mutable ptr = 0
   
  -        override this.Finalize() : 'Result = k (String.Concat(buf))
  -        override this.Write(s : string) = 
  +        override __.Finalize() : 'Result = k (String.Concat(buf))
  +        override __.Write(s : string) = 
               buf.[ptr] <- s
               ptr <- ptr + 1
           override this.WriteT(s) = this.Write s
   
       type StringBuilderPrintfEnv<'Result>(k, buf) = 
           inherit PrintfEnv<Text.StringBuilder, unit, 'Result>(buf)
  -        override this.Finalize() : 'Result = k ()
  -        override this.Write(s : string) = ignore(buf.Append(s))
  -        override this.WriteT(()) = ()
  +        override __.Finalize() : 'Result = k ()
  +        override __.Write(s : string) = ignore(buf.Append(s))
  +        override __.WriteT(()) = ()
   
       type TextWriterPrintfEnv<'Result>(k, tw : IO.TextWriter) =
           inherit PrintfEnv<IO.TextWriter, unit, 'Result>(tw)
  -        override this.Finalize() : 'Result = k()
  -        override this.Write(s : string) = tw.Write s
  -        override this.WriteT(()) = ()
  +        override __.Finalize() : 'Result = k()
  +        override __.Write(s : string) = tw.Write s
  +        override __.WriteT(()) = ()
       
       let inline doPrintf fmt f = 
           let formatter, n = Cache<_, _, _, _>.Get fmt
  
positive.code:             let typesArray = stackToArray typesArraySize typesArrayStartPos typesArrayTotalCount types
              argsArray, typesArray
  
          member this.PopContinuationWithType() = 
              System.Diagnostics.Debug.Assert(args.Count = 1, "args.Count = 1")
              System.Diagnostics.Debug.Assert(types.Count = 1, "types.Count = 1")
              
  
negative.code: 
              cont, contTy
  
          member __.PopValueUnsafe() = args.Pop()
  
          member this.PushContinuationWithType (cont : obj, contTy : Type) = 
              System.Diagnostics.Debug.Assert(this.IsEmpty, "this.IsEmpty")
  