Re: Fundamental mode vs. special mode

[Chong Yidong]

Johan Bockgård <address@hidden> writes:

>> It's not a good idea to add anything to Fundamental mode.  The point of
>> it is to be fundamental.
>
> FWIW,
>
> 2010-04-28  Stefan Monnier  <address@hidden>
>
> Make it possible to locally disable a globally enabled mode.
> * simple.el (fundamental-mode): Run fundamental-mode-hook.
> * emacs-lisp/derived.el (define-derived-mode): Use fundamental-mode
> rather than kill-all-local-variables so it runs fundamental-mode-hook.
> * emacs-lisp/easy-mmode.el (define-globalized-minor-mode):
> Use fundamental-mode-hook to run MODE-enable-in-buffers earlier, so
> that subsequent hooks get a chance to disable it.

Thanks for pointing this out.  I think this change is problematic.
IIUC, it introduces a nontrivial backward incompatibility: major modes
defined with define-derived-mode now run fundamental-mode-hook, and thus
behave differently from major modes that are defined directly according
to previous Emacs guidelines for major modes (which was to simply call
kill-all-local-variables).