new_constants_in

# File activesupport/lib/active_support/dependencies.rb, line 325
  def new_constants_in(*descs)
    log_call(*descs)

    # Build the watch frames. Each frame is a tuple of
    #   [module_name_as_string, constants_defined_elsewhere]
    watch_frames = descs.collect do |desc|
      if desc.is_a? Module
        mod_name = desc.name
        initial_constants = desc.local_constant_names
      elsif desc.is_a?(String) || desc.is_a?(Symbol)
        mod_name = desc.to_s

        # Handle the case where the module has yet to be defined.
        initial_constants = if qualified_const_defined?(mod_name)
          mod_name.constantize.local_constant_names
        else
         []
        end
      else
        raise Argument, "#{desc.inspect} does not describe a module!"
      end

      [mod_name, initial_constants]
    end

    constant_watch_stack.concat watch_frames

    aborting = true
    begin
      yield # Now yield to the code that is to define new constants.
      aborting = false
    ensure
      # Find the new constants.
      new_constants = watch_frames.collect do |mod_name, prior_constants|
        # Module still doesn't exist? Treat it as if it has no constants.
        next [] unless qualified_const_defined?(mod_name)

        mod = mod_name.constantize
        next [] unless mod.is_a? Module
        new_constants = mod.local_constant_names - prior_constants

        # Make sure no other frames takes credit for these constants.
        constant_watch_stack.each do |frame_name, constants|
          constants.concat new_constants if frame_name == mod_name
        end

        new_constants.collect do |suffix|
          mod_name == "Object" ? suffix : "#{mod_name}::#{suffix}"
        end
      end.flatten

      log "New constants: #{new_constants * ', '}"

      if aborting
        log "Error during loading, removing partially loaded constants "
        new_constants.each { |name| remove_constant name }
        new_constants.clear
      end
    end

    return new_constants
  ensure
    # Remove the stack frames that we added.
    if defined?(watch_frames) && ! watch_frames.blank?
      frame_ids = watch_frames.collect(&:object_id)
      constant_watch_stack.delete_if do |watch_frame|
        frame_ids.include? watch_frame.object_id
      end
    end
  end