You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_sexp.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/ripper
    
    the code of the file until where you have to start completion: # frozen_string_litera
    
  def clear_pos(sexp)
    return sexp if !sexp
    sexp.each do |e|
      if Array === e
        if e.size == 3 and Array === (last = e.last) and
          last.size == 2 and Integer === last[0] and Integer === last[1]
          last.clear
        else
          clear_pos(e)
        end
      end