to_string

# File actionview/lib/action_view/render_parser/ripper_render_parser.rb, line 67
        def to_string
          raise unless string?

          # s(:string_literal, s(:string_content, map))
          self[0].map do |node|
            case node.type
            when :@tstring_content
              node[0]
            when :string_embexpr
              "*"
            end
          end.join("")
        end