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From: Michael Heerdegen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: 36067@debbugs.gnu.org
Subject: bug#36067: 27.0.50; Edebug leaves undefined RET in minibuffer
Date: Sun, 21 Apr 2024 06:24:26 +0200	[thread overview]
Message-ID: <87sezfibr9.fsf@web.de> (raw)
In-Reply-To: <87muiztno9.fsf@web.de> (Michael Heerdegen's message of "Mon, 03 Jun 2019 04:20:22 +0200")

Hello,

Something that might be related:

If you edebug some code that uses `unwind-protect' to ensure certain
cleanup things are done, and you quit Edebug before those protected
forms are reached, they will never be executed.  This can break your
session in diverse surprising ways.

Here is a harmless example to demonstrate what I mean:

#+begin_src emacs-lisp
(defvar a 0)

(unwind-protect
    (progn (setq a 27)
           (message "%d" (+ a 19)))
  (setq a 0))
#+end_src

When you edebug the `unwind-protect' form and hit q (quit) when the
`message' call has been reached, your session will remain with a binding
of 27 for a - which is normally impossible and should never happen.

Quitting Edebug is a very dangerous operation for an Emacs session.


Michael.





  parent reply	other threads:[~2024-04-21  4:24 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-03  2:20 bug#36067: 27.0.50; Edebug leaves undefined RET in minibuffer Michael Heerdegen
2019-06-21 10:14 ` Noam Postavsky
2019-06-21 14:59   ` Michael Heerdegen
2019-07-09  2:08     ` Michael Heerdegen
2019-06-21 15:14   ` Eric Abrahamsen
2019-06-21 15:59     ` Michael Heerdegen
2019-06-22  8:22     ` martin rudalics
2021-08-10 16:11     ` Lars Ingebrigtsen
2024-04-21  4:24 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2024-04-21  6:02   ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors

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