class Gem::Commands::SetupCommand

def remove_old_bin_files(bin_dir)
  old_bin_files = {
    'gem_mirror' => 'gem mirror',
    'gem_server' => 'gem server',
    'gemlock' => 'gem lock',
    'gemri' => 'ri',
    'gemwhich' => 'gem which',
    'index_gem_repository.rb' => 'gem generate_index',
  }
  old_bin_files.each do |old_bin_file, new_name|
    old_bin_path = File.join bin_dir, old_bin_file
    next unless File.exist? old_bin_path
    deprecation_message = "`#{old_bin_file}` has been deprecated.  Use `#{new_name}` instead."
    File.open old_bin_path, 'w' do |fp|
      fp.write <<-EOF
#{Gem.ruby}
ort "#{deprecation_message}"
  EOF
    end
    next unless Gem.win_platform?
    File.open "#{old_bin_path}.bat", 'w' do |fp|
      fp.puts %{@ECHO.#{deprecation_message}}
    end
  end
end