Simplify @type parsing method.

    # without them at all.

    def at_type

      add_tag(:type)

      skip_horiz_white

      if look(/\{/)

        tdf = typedef

        @current_tag[:type] = tdf[:type]

        @current_tag[:optional] = true if tdf[:optional]

      elsif look(/\S/)

      maybe_type

      if !@current_tag[:type] && look(/\S/)

        @current_tag[:type] = match(/\S+/)

      end

    end