# File lib/bundler/ruby_version.rb, line 86
    def engine_version
      case engine
      when "ruby"
        RUBY_VERSION.dup
      when "rbx"
        Rubinius::VERSION.dup
      when "jruby"
        JRUBY_VERSION.dup
      else
        raise BundlerError, "That RUBY_ENGINE is not recognized"
        nil
      end
    end