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

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

[Juanma Barranquero]

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.

Setting major-mode to a lambda expression is undocumented, and the
workaround for my problem is just adding a defun, so this is not
exactly a bug report. But perhaps you'll want to check whether the
change has other subtle implications.

  Juanma

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

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

[Juanma Barranquero]

On Wed, Jul 4, 2012 at 1:39 PM, Dmitry Antipov <dmantipov@yandex.ru> wrote:

> 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' =>

Try my recipe:

A one-line .emacs, with just

  (setq-default major-mode (lambda () (fundamental-mode)))

then:

  emacs
  C-x C-f ~/.emacs <RET>

I get an error on trunk, no error on 24.1.

    Juanma

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

[Dmitry Antipov]

On 07/04/2012 03:45 PM, Juanma Barranquero wrote:

> Try my recipe:
>
> A one-line .emacs, with just
>
>    (setq-default major-mode (lambda () (fundamental-mode)))
>
> then:
>
>    emacs
>    C-x C-f ~/.emacs <RET>
>
> I get an error on trunk, no error on 24.1.

Should be fixed in 108863. Thanks.

Dmitry