# File lib/ruby_parser/bm_sexp.rb, line 101
  def hash
    #There still seems to be some instances in which the hash of the
    #Sexp changes, but I have not found what method call is doing it.
    #Of course, Sexp is subclasses from Array, so who knows what might
    #be going on.
    @my_hash_value ||= super
  end