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Subject: Re: Removing line and column number settings from some buffers
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(defvar ring (ring-convert-sequence-to-ring '(nil t always)))

(defvar current nil)

(defun next ()
  (interactive)
  (setq current  (ring-next ring current))
   (message "NOW: %s" current))
 
 (defun previous ()
   (interactive)
   (setq current  (ring-previous ring current))
   (message "NOW: %s" current))

> Sorry, typo.  Variable `toto' should be variable `ring'.
> (Or vice versa - there should be only one ring variable.)

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Thank you. That built-in feature is great and I can use it for history
in Hyperscope dynamic knowledge repository.