anchor.diff:  // *********************************
   // Pipes vs. Composition
   // *********************************
  -
   // Pipe operator
   let sum =
       [|1..10|] 
  
positive.code: 
  // Async with continuations
  
  let fetchGitHubAsync url = async {
      try
          let uri = new System.Uri(url)
          let webClient = new WebClient()
  
negative.code:     | Post of int
      | Reply of int * AsyncReplyChannel<string>
  
  let postMessage =
      function // function-syntax pattern matching
      | Post i -> i
      | Reply (i, a) -> i
  