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: specification_policy.rb
    path of file: ./repos/ruby/lib/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "user_interaction"

class Gem::SpecificationPolicy
  include Gem::UserInteraction

  VALID_NAME_PATTERN = /\A[a-zA-Z0-9\.\-\_]+\z/ # :nodoc:

  SPECIAL_CHARACTERS = /\A[#{Regexp.escape(".-_")}]+/ # :nodoc:

  VALID_URI_PATTERN = %r{\Ahtt
    
  def validate_dependencies # :nodoc:
    warning_messages = []
    @specification.dependencies.each do |dep|
      if dep.name == @specification.name # warn on self reference
        warning_messages << "Self referencing dependency is unnecessary and strongly discouraged."
      end

      prerelease_dep = dep.requirements_list.any? do |req|
        Gem::Requirement.new(req).prerelease?
      end

      warning_messages << "prerelease dependency on #{dep} is not recommended" if
          prerelease_dep && !@specification.version.prerelease?

      open_ended = dep.requirement.requirements.all? do |op, version|
        !version.prerelease? && [">", ">="].include?(op)
      end

      next unless open_ended
      op, dep_version = dep.requirement.requirements.first

      segments = dep_version.segments

      base = segments.first 2

      recommendation = if [">", ">="].include?(op) && segments == [0]
        "  use a bounded requirement, such as \"~> x.y\""
      else
        bugfix = if op == ">"
          ", \"> #{dep_version}\""
        elsif op == ">=" && base != segments
          ", \">= #{dep_version}\""
        end