def to_ruby
      @constants.sort_by { |name,| name }.map do |name, constant|
        if constant.value.nil? then
          "# #{name} not available"
        else
          constant.to_ruby
        end
      end.join "\n"
    end
def to_ruby
      @constants.sort_by { |name,| name }.map do |name, constant|
        if constant.value.nil? then
          "# #{name} not available"
        else
          constant.to_ruby
        end
      end.join "\n"
    end
Outputs values for discovered constants.  If the constant's value was
 not discovered it is not omitted.