You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: reverse_stackable_values.rb
    path of file: ./repos/grape/lib/grape/util
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'stackable_values'

module Grape
  module Util
    cl
    
      def concat_values(inherited_value, new_value)
        return inherited_value unless new_value

        [].tap do |value|
          value.concat(new_value)
          value.concat(inherited_value)
        end
      end