add_version_option

# File lib/rubygems/version_option.rb, line 52
  def add_version_option(task = command, *wrap)
    OptionParser.accept Gem::Requirement do |value|
      Gem::Requirement.new(*value.split(/\s*,\s*/))
    end

    add_option('-v', '--version VERSION', Gem::Requirement,
               "Specify version of gem to #{task}", *wrap) do
                 |value, options|
      options[:version] = value

      explicit_prerelease_set = !options[:explicit_prerelease].nil?
      options[:explicit_prerelease] = false unless explicit_prerelease_set

      options[:prerelease] = value.prerelease? unless
        options[:explicit_prerelease]
    end
  end