GNU bug report logs - #38642
'C-x RET c' gets stuck in universal-argument loop

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Package: emacs;

Reported by: Juri Linkov <juri <at> linkov.net>

Date: Mon, 16 Dec 2019 22:53:01 UTC

Severity: normal

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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From: Juri Linkov <juri <at> linkov.net>
To: 38642 <at> debbugs.gnu.org
Subject: bug#38642: 'C-x RET c' gets stuck in universal-argument loop
Date: Mon, 16 Dec 2019 23:56:08 +0200

emacs -Q
C-x RET c       ;; universal-coding-system-argument
RET             ;; accept default e.g. utf-8-unix
C-u C-b         ;; moves backwards 4 chars
C-b C-b C-b ...

Every C-b still moves backwards 4 chars because it gets stuck with an old
'prefix-arg' in the 'while' loop in 'universal-coding-system-argument'.

It gets out of this loop only on an error such as when point reaches
the beginning of the buffer that signals an error.

PS: this is the simplest reproducible case, but I found this bug
by trying to use 'C-x RET c C-u C-u M-x rgrep' that with two C-u prefixes
allows editing the grep command.
This bug report was last modified 5 years and 182 days ago.

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