bug#36903: 27.0.50; gnus registry vs. debbugs

[Noam Postavsky]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

>> Huh, right after the definition of `gnus-registry-unload-hook' is this
>> line:
>>
>> (add-hook 'gnus-registry-unload-hook 'gnus-registry-unload-hook)
>
> Added by RMS in 2004! Still don't see what it's supposed to do --
> there's no such hook, and it's never called.

It could be called by unload-feature, though it would be better to
rename it gnus-registry-unload-function instead:

    (defun unload-feature (feature &optional force)
      [...]
      (let* ([...]
             (unload-hook (intern-soft (concat name "-unload-hook")))
             (unload-func (intern-soft (concat name "-unload-function"))))
          [...]
          ;; This is obsolete; FEATURE-unload-function should be used now.
          (run-hooks unload-hook)

See also (info "(elisp) Unloading")