anchor.diff:  
   let private copyContentFilesToProject (project : ProjectFile) packagesWithContent = 
   
  -    let blackList (fi : FileInfo) = 
  +    let onBlackList (fi : FileInfo) = 
           let rules : list<(FileInfo -> bool)> = [
  -            fun f -> f.Name <> "_._"
  +            fun f -> f.Name = "_._"
  +            fun f -> Regex(".*\.transform").IsMatch f.Name
           ]
           rules
  -        |> List.forall (fun rule -> rule(fi))
  +        |> List.exists (fun rule -> rule(fi))
   
       let rec copyDirContents (fromDir : DirectoryInfo, toDir : Lazy<DirectoryInfo>) =
           fromDir.GetDirectories() |> Array.toList
  
positive.code: open System.IO
  open System.Collections.Generic
  open Paket.PackageSources
  
  /// Downloads and extracts all packages.
  let ExtractPackages(sources,force, packages:PackageResolution) = 
  
negative.code:         |> List.append
              (fromDir.GetFiles() 
                  |> Array.toList
                  |> List.filter (onBlackList >> not)
                  |> List.map (fun file -> file.CopyTo(Path.Combine(toDir.Force().FullName, file.Name), true)))
  
      packagesWithContent
  