anchor.diff:      then
           failWith()
   
  +/// [omit]
   let buildNuGetArgs setParams packageId = 
       let parameters = RestoreSinglePackageDefaults |> setParams
       let sources =
  
positive.code:       ExcludeVersion: bool
        IncludePreRelease: bool }
  
  /// RestoreSinglePackageParams defaults params  
  let RestoreSinglePackageDefaults =
      { ToolPath = RestorePackageDefaults.ToolPath
        Sources = []
  
negative.code: /// Restores all packages from NuGet to the default directories
  let RestorePackages() = 
      !! "./**/packages.config"
      |> Seq.iter (RestorePackage id)