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unload-feature and defcustom.

From: Lute Kamstra
Subject: unload-feature and defcustom.
Date: Fri, 29 Apr 2005 15:51:41 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

unload-feature does not completely reverse the effects of defcustom.

Consider this file:

,----[ a.el ]
| (defcustom a-cus-var 'a-value 
|   "The documentation of `a-cus-var'.")
| (provide 'a)

and do:

(require 'a)
(unload-feature 'a)

Now a-cus-var is not bound, but when I do M-x customize-option, I can
still select (with completion) a-cus-var and that gives me this
customization buffer:

,----[ *Customize Option: A Cus Var* ]
| This is a customization buffer.
| `Raised' buttons show active fields; type RET or click mouse-1
| on an active field to invoke its action.  Editing an option value
| changes only the text in the buffer.  Invoke the State button to set or
| save the option value.  Saving an option normally edits your init file.
| Invoke Custom file for information on how to save in a different file.
| Invoke Help for general information.
| Operate on everything in this buffer:
|  Set for Current Session Save for Future Sessions
|  Reset Reset to Saved Erase Customization   Finish
| A Cus Var: Hide Value "nil"
|    State: CHANGED outside Customize; operating on it here may be unreliable.
| The documentation of `a-cus-var'.
| Parent groups: Nil

I think this is undesirable.  Could this be easily fixed?  (Maybe by
letting customize ignore unbound vars.)  Or is better to put this on
the post-release todo list?


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