Re: [Emacs-diffs] /srv/bzr/emacs/trunk r108836: Cleanup basic buffer management.

[Dmitry Antipov]

On 07/03/2012 07:35 PM, Juanma Barranquero wrote:

> Before 108836, this worked:
>
> (setq-default major-mode (lambda () ...))
> (find-file ...)
>
> Now it fails; major-mode gets assigned some bogus value.
>
> This is what I was using, BTW:
>
>    (setq-default major-mode
>                  (lambda ()
>                    (if buffer-file-name
>                        (fundamental-mode)
>                      (let ((buffer-file-name (buffer-name)))
>                        (set-auto-mode)))))
>
> but just
>
>    (setq-default major-mode (lambda () (fundamental-mode)))
>
> is enough to show the problem.

I tried both 24.1 and trunk revision 108858, and both behaves identically:

1) Start a fresh instance
2) Staying in *scratch*, eval:
(setq-default major-mode (lambda () (fundamental-mode))) => (lambda (nil) 
(fundamental-mode))
3) M-x describe-variable, enter 'major mode' =>

major-mode is a variable defined in `C source code'.
Its value is lisp-interaction-mode
Original value was fundamental-mode
Local in buffer *scratch*; global value is
(lambda nil
  (fundamental-mode))

[etc...]

Dmitry