Subject: bug#72759: 31.0.50; Emacs hangs with open-paren-in-column-0-is-defun-start set to nil

From: Eli Zaretskii <[email-masked]>
Date: Thu, 22 Aug 2024 13:56:28 +0300

> Date: Thu, 22 Aug 2024 12:07:38 +0200
> From:  Eshel Yaron via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email-masked]>
> 
> 
> 1. emacs -Q
> 2. (setq open-paren-in-column-0-is-defun-start nil)
> 3. Insert " (foo"
> 4. M-x flymake-mode
> 5. Emacs hangs
> 
> I can reproduce this with Emacs 29 and later.

Thanks.  Could you show the Lisp backtrace from the hang (assuming it
hangs in Lisp code)?