;;; -*- lexical-binding: nil -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/geh-dyn.el

(when nil

(defvar gsdd 3)

(defun test-gsdd-gsdd ()
  gsdd)

(defun test-gsdd (&optional gsdd)
  (or gsdd (setq gsdd 4))
  (list (test-gsdd-gsdd) gsdd) )

;; (test-gsdd-gsdd) ;     3 - global/dynamic gsdd
;; (test-gsdd)      ; (4 4) - global/dynamic, is it the same gsdd?
;; (test-gsdd 5)    ; (5 5) - OK

;; It is the (4 4) case that is weird since gsdd seems to be
;; nil, i.e. the format parameter (optional argument) is
;; refered to, in `or'; _but_ in `setq' it refers to the
;; global/special/dynamic variable.

)

(provide 'geh-dyn)