def dialects_for(symbols)
      info = self.class.tag_dispatching_name(symbols, "_diatag")
      raise ArgumentError, "No tag for #{symbols}" unless respond_to?(info)
      send(info)
    end
def dialects_for(symbols)
      info = self.class.tag_dispatching_name(symbols, "_diatag")
      raise ArgumentError, "No tag for #{symbols}" unless respond_to?(info)
      send(info)
    end
Returns the dialects used to parse the blocks associated with `symbols`, as
 previously installed by `define_tag_method`.