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: source_index.rb
    path of file: ./repos/yard/lib/yard/rubygems/backports
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
#--
#
    
  def outdated
    outdateds = []

    latest_specs.each do |local|
      dependency = Gem::Dependency.new local.name, ">= #{local.version}"

      fetcher = Gem::SpecFetcher.fetcher
      remotes = fetcher.find_matching dependency
      remotes = remotes.map {|(_, version, _), _| version }

      latest = remotes.sort.last

      outdateds << local.name if latest && local.version < latest
    end

    outdateds
  end