bug#636: Please fix before the release of 23.1

[Chong Yidong <cyd@stupidchicken.com>]

Ulrich Mueller <ulm@gentoo.org> writes:

>>>>>> On Sun, 10 Aug 2008, I wrote:
>
>> ,----[ test.el ]
>> | (progn
>> |   (require 'cc-mode))
>> `----
>
>> $ emacs -Q test.el
>> M-x eval-buffer
>
>> This will result in an error: Invalid read syntax: ")"
>
> The problem goes away if I revert the following change:
>
> 2008-06-27  Alan Mackenzie  <acm@muc.de>
>
> 	* progmodes/cc-defs.el (c-emacs-features): New feature
> 	'argumentative-bod-function.

Thanks for pinpointing this.

In fact, it's apparently not a problem with cc-mode, but with Emacs.
Here's a stripped-down recipe:

1. Create a file foo.el in your lisp path with the following contents:

(defconst foo
  (let ((beginning-of-defun-function
	 (lambda (&optional arg)
	   (not (eq arg nil)))))
    (progn
      (beginning-of-defun 1))))

(provide 'foo)

2. Byte-compile it (M-x byte-compile-file RET).

3. Create a file test.el with the following contents:

(progn
  (require 'foo))

4. emacs test.el

5. M-x eval-buffer

Debugger entered--Lisp error: (invalid-read-syntax ")")
  eval-buffer()  ; Reading at buffer position 25
  call-interactively(eval-buffer t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)


I don't know what causes this bug, though.  Anyone?