# File lib/brakeman/processors/base_processor.rb, line 85
  def process_dstr exp
    exp = exp.dup
    exp.shift
    exp.map! do |e|
      if e.is_a? String
        e
      else
        res = process e
        if res.empty?
          nil
        else
          res
        end
      end
    end.compact!

    exp.unshift :dstr
  end