add_instance_variables_to_assigns

# File actionpack/lib/action_controller/base.rb, line 1154
      def add_instance_variables_to_assigns
        @@protected_variables_cache ||= Set.new(protected_instance_variables)
        instance_variables.each do |var|
          next if @@protected_variables_cache.include?(var)
          @assigns[var[1..-1]] = instance_variable_get(var)
        end
      end