# File lib/ruby_lexer.rb, line 1300
  def yylex_paren19 # TODO: move or remove
    result =
      if is_beg? then
        :tLPAREN
      elsif is_space_arg? then
        :tLPAREN_ARG
      else
        :tLPAREN2 # plain '(' in parse.y
      end

    # paren_nest++; # TODO

    result
  end