From: "Basil L. Contovounesios" <contovob@tcd.ie>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: Francis Wright <francis.j.wright@gmail.com>,
f.j.wright@live.co.uk, 30529@debbugs.gnu.org
Subject: bug#30529: 26.0.91; minibuffer errors change standard-output
Date: Sun, 29 Nov 2020 15:29:03 +0000 [thread overview]
Message-ID: <87360sdvwg.fsf@tcd.ie> (raw)
In-Reply-To: <874klcql7u.fsf@gnus.org> (Lars Ingebrigtsen's message of "Thu, 26 Nov 2020 14:52:21 +0100")
Lars Ingebrigtsen <larsi@gnus.org> writes:
> Francis Wright <francis.j.wright@gmail.com> writes:
>
>> A user-error in the minibuffer can change the value of standard-output
>> (to t) within the environment that invoked the minibuffer, whereas I
>> think the minibuffer should rebind standard-output locally and not
>> change its global value. Here is a simple way to illustrate this
>> problem. Evaluate the following:
>>
>> (defun STANDARD-LISP ()
>> "Run Standard LISP with input via the minibuffer and output via a buffer."
>> (interactive)
>> (switch-to-buffer (get-buffer-create "*Standard LISP*"))
>> (let (value
>> (standard-output (current-buffer)))
>> (while t
>> (terpri)
>> (princ "Eval: ")
>> (setq value (read))
>> ;; (read) errors change standard-output to *Messages* buffer,
>> ;; so...
>> ;; (setq standard-output (current-buffer))
>> (prin1 value) (terpri)
>> (setq value (eval value))
>> (terpri)
>> (princ "====> ") (princ value) (terpri))))
>
> (This bug report unfortunately got no response at the time.)
>
> This problem is still present in Emacs 28. I tried following the code
> logic for a couple of minutes to see just what it is that's (re)setting
> `standard-output' here, but was unable to locate the location.
>
> Anybody know?
Just from a quick grep, could it be recursive_edit_1?
Does error handling invoke a recursive edit e.g. for entering the
debugger?
--
Basil
next prev parent reply other threads:[~2020-11-29 15:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-19 16:04 bug#30529: 26.0.91; minibuffer errors change standard-output Francis Wright
2020-11-26 13:52 ` Lars Ingebrigtsen
2020-11-29 15:29 ` Basil L. Contovounesios [this message]
2020-11-30 9:41 ` Lars Ingebrigtsen
2021-08-12 14:34 ` Lars Ingebrigtsen
2021-08-12 15:04 ` Andreas Schwab
2021-08-13 11:22 ` Lars Ingebrigtsen
2021-08-12 15:58 ` Eli Zaretskii
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