module methods added via extend are wrongly reported as never_called

[alainravet]

How to reproduce :

$ cd <pp project root>
$ PP_OPTIONS="--show-never-called" bundle exec ruby -Ilib spec/fixtures/bug_22.rb

---

module Extra
  def self.included(base)
    base.extend(ClassMethods)
  end
  module ClassMethods
    def a_class_method_via_module_Extra ; end
  end
end


class Simple
  include Extra
end
Simple.a_class_method_via_module_Extra

$ PP_OPTIONS="--show-never-called" be ruby -Ilib doc/fixtures/bug_22.rb

output :

====================================================================================
=                               PrivatePlease report :                             =
====================================================================================

Extra::ClassMethods

    * Methods that were never called :
    . . . . . . . . . . . . . . . . . . . . .
      #a_class_method_via_module_Extra

====================================================================================
Default display overriden :
 $PP_OPTIONS = "--show-bad-candidates --show-never-called"