What's up with line 4 in the exuberant_ctags output?

shell.out

$ exuberant_ctags -e testdata/ruby/dog.rb 
$ cat TAGS
^L
(null),142
module Animal^?Animal^A1,0
  class Base^?Base^A5,34
  class Dog < Animal::Base^?Dog^A8,54
    def speak(string)^?speak^A11,111
    def wag^?wag^A15,165