anchor.diff:        LegacyReferenceFileFolders : LibFolder list
         NewReferenceFileFolders : LibFolder list
         TargetsFileFolders : LibFolder list
  -      Analyzers: AnalyzerLib list}
  +      Analyzers: AnalyzerLib list
  +      LicenseUrl: string option }
   
   
   [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
  
positive.code:           LegacyReferenceFileFolders = []
            NewReferenceFileFolders = []
            TargetsFileFolders = [] 
            Analyzers = [] }
      let getReferenceFolders (installModel: InstallModel) =
          if installModel.NewReferenceFileFolders.IsEmpty then
            installModel.LegacyReferenceFileFolders
  
negative.code:             }
          mapFiles mapfn this
  
      let addLicense url (model: InstallModel) =
          if String.IsNullOrWhiteSpace url then model 
          else  { model with LicenseUrl = Some url }
  
      let createFromLibs packageName packageVersion frameworkRestrictions libs targetsFiles analyzerFiles (nuspec:Nuspec) = 
          emptyModel packageName packageVersion
          |> addLibReferences libs nuspec.References
  