anchor.diff:          element
   
       let buildFrameworkReferencesNode frameworkAssembliesList =
  -        if frameworkAssembliesList = [] then () else
  +        if List.isEmpty frameworkAssembliesList then () else
           let d = XElement(ns + "frameworkAssemblies")
           frameworkAssembliesList |> List.iter (buildFrameworkReferencesNode >> d.Add)
           metadataNode.Add d
  
positive.code:         dep
  
      let buildReferencesNode referenceList =
          if referenceList = [] then () else
          let d = XElement(ns + "references")
          referenceList |> List.iter (buildReferenceNode >> d.Add)
          metadataNode.Add d
  
negative.code: 
      let exclusions =
          optional.FilesExcluded
          |> List.map (fun e -> Path.Combine(workingDir,e) |> fixRelativePath |> Fake.Globbing.isMatch)
  
      let isExcluded p =
          let path = DirectoryInfo(p).FullName
  