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defvar and "special-variable-p"-ness
From: |
Eduardo Ochs |
Subject: |
defvar and "special-variable-p"-ness |
Date: |
Sat, 14 Aug 2021 20:02:55 -0300 |
Hi list,
after "defvar"-ing a variable its "special-variable-p"-ness becomes
true. Is there a way to make its "special-variable-p"-ness nil again?
That would be useful for some tests that I am trying to write...
By the way, I thought that "unload-feature" would be able to revert
the "special-variable-p"-ness of a variable back to nil, but it seems
that it doesn't do that. Here's how I tested it. I created a file
"/tmp/myfile.el" with just these three lines,
;; Copy this 3-line block to /tmp/myfile.el
(defvar myvar 99)
(provide 'myfile)
Then I ran the uncommented sexps below one by one with my favorite
variant of `C-x C-e':
(setq myvar 42)
(special-variable-p 'myvar)
;; ^ --> nil
(require 'myfile "/tmp/myfile.el")
(assoc "/tmp/myfile.el" load-history)
;; ^ --> ("/tmp/myfile.el" myvar (provide . myfile))
(special-variable-p 'myvar)
;; ^ --> t
(unload-feature 'myfile)
(assoc "/tmp/myfile.el" load-history)
;; ^ --> nil
(special-variable-p 'myvar)
;; ^ --> t
Thanks in advance!
Eduardo Ochs
http://angg.twu.net/#eev
http://angg.twu.net/eev-intros/find-lexical-intro.html
- defvar and "special-variable-p"-ness,
Eduardo Ochs <=