# File lib/ruby2ruby.rb, line 419
  def util_dthing(exp, dump=false)
    s = []
    s << exp.shift.dump[1..-2]
    until exp.empty?
      pt = exp.shift
      s << case pt.first
           when :str then
             if dump then
               pt.last.dump[1..-2]
             else
               pt.last.gsub(%r%/%, '\/')
             end
           else
             "#\{#{process(pt)}}"
           end
    end
    s
  end