This is either a bug or a feature request.

Summary: cperl-mode: Support for outlining (much like that in perl-mode)

1. Add this to your .emacs

      (add-hook 'perl-mode-hook 'outline-minor-mode)
      (add-hook 'cperl-mode-hook 'outline-minor-mode)

      (add-hook 'outline-minor-mode-hook
        (lambda ()
          (define-key outline-minor-mode-map [(control tab)] 'org-cycle)
          ;; (define-key outline-minor-mode-map [(shift tab)] 'org-global-cycle)
          (define-key outline-minor-mode-map [backtab] 'org-global-cycle)
          ))

2. C-x C-f org.pl
3. M-x perl-mode

4. Do this <S-iso-lefttab>, <S-iso-lefttab>

   See the attached screenshot for what I get.

5. M-x cperl-mode
6. Repeat step 4.

   Nothing interesting happens.  Only thing I see is this message.

      --8<---------------cut here---------------start------------->8---
         hide-sublevels: Must keep at least one level of headers [3 times]
      --8<---------------cut here---------------end--------------->8---


Expected behaviour
==================

I should be able to "cycle" through the visibility.