anchor.diff:  /// Parameter 2: fileName - The fileName of the zip file.
   let Unzip target fileName =  
       let zip = new FastZip()
  -    zip.ExtractZip (fileName, target, "")
  -    +    zip.ExtractZip (fileName, target, "")
positive.code:   if not (String.IsNullOrEmpty comment) then      
      stream.SetComment comment
      
    let buffer = Array.create 32768 (byte 0)
  
    for item in files do      
      let info = new FileInfo(item)      
  
negative.code: module Fake.ZipHelper
  
  open System.IO
  open ICSharpCode.SharpZipLib.Zip
  open System.Globalization
  open System
  
  /// The default zip level
  let DefaultZipLevel = 7
  
  /// Creates a zip file with the given files
  let CreateZip workingDir fileName comment level flatten files =
    let workingDir =
      let dir = new DirectoryInfo(workingDir)
      if not dir.Exists then failwithf "Directory not found: %s" dir.FullName
  