class Regexp::Expression::Group::Options

longer inherit from Group because it is effectively a terminal expression.
TODO: should split off OptionsSwitch in v3.0.0. Maybe even make it no

def initialize_copy(orig) 

def initialize_copy(orig)
  self.option_changes = orig.option_changes.dup
  super
end

def quantify(*args) 

def quantify(*args)
  if token == :options_switch
    raise Regexp::Parser::Error, 'Can not quantify an option switch'
  else
    super
  end
end