anchor.diff:  #I "../../bin"
   
   #r @"../../src/FSharpPlus/bin/Release/net45/FSharpPlus.dll"
  -open FSharpPlus
  -open FSharpPlus.Lens
  -open FSharpPlus.Data
   
   (**
   Lens
  
positive.code: ====
  
  *)
  
  
  let f1 = over both length ("hello","world")
  // val f1 : int * int = (5, 5)
  
negative.code: 
  *)
  open System
  // In order to use the Lens module of F#+ we import the following:
  open FSharpPlus.Lens
  
  // From Mauricio Scheffer: https://gist.github.com/mausch/4260932
  type Person = {
      Name: string
  