module T::Private::Methods

def self.add_module_with_final_method(mod, method_name, is_singleton_method)
  m = is_singleton_method ? mod.singleton_class : mod
  mid = m.object_id
  methods = @modules_with_final[mid]
  if methods.nil?
    methods = {}
    @modules_with_final[mid] = methods
  end
  methods[method_name] = true
  nil
end