How to access a class constant dynamically from inside a module when the module is included into the class

dynamic_const_reference.rb

module Foo
  def foo
    # This does not work:
    # TYPES

    # This works:
    self.class.const_get('TYPES')
  end
end

class Bar
  TYPES = 'You found me!'
  include Foo
end

Bar.new.foo