psych_gemfile_entry

# File railties/lib/rails/generators/app_base.rb, line 294
      def psych_gemfile_entry
        return [] unless defined?(Rubinius)

        comment = 'Use Psych as the YAML engine, instead of Syck, so serialized '                    'data can be read safely from different rubies (see http://git.io/uuLVag)'
        GemfileEntry.new('psych', '~> 2.0', comment, platforms: :rbx)
      end