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bug#26650: 26.0.50; Protect *Backtrace* from accidental killing


From: Tino Calancha
Subject: bug#26650: 26.0.50; Protect *Backtrace* from accidental killing
Date: Wed, 26 Apr 2017 22:57:23 +0900 (JST)
User-agent: Alpine 2.20 (DEB 67 2015-01-07)



On Wed, 26 Apr 2017, npostavs@users.sourceforge.net wrote:

Eli Zaretskii <eliz@gnu.org> writes:

+  (add-hook 'kill-buffer-hook
+            (lambda () (if (> (recursion-depth) 0) (top-level))) nil t)

This will throw to top-level when _any_ buffer is killed, as long as
we are in recursive-edit, no?
No, because `add-hook' is called with non-nil LOCAL arg.

Right, sorry for not paying attention.

Maybe I should have written

   (add-hook 'kill-buffer-hook (lambda ...) nil 'local)

to emphasize this?  I'm still undecided on the general style question of
whether to use t or '<symbol> in these cases.
This reminds me the discussion here:
https://github.com/bbatsov/emacs-lisp-style-guide/issues/30





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