class Prism::Translation::Ripper::SexpBuilder

def on_heredoc_dedent(val, width)
  sub = proc do |cont|
    cont.map! do |e|
      if Array === e
        case e[0]
        when :@tstring_content
          e = dedent_element(e, width)
        when /_add\z/
          e[1] = sub[e[1]]
        end
      elsif String === e
        dedent_string(e, width)
      end
      e
    end
  end
  sub[val]
  val
end