GNU bug report logs - #23425
master branch: `message' wrongly corrupts ' to curly quote.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Subject: bug#23425: closed (Re: bug#23425: master branch: `message'
 wrongly corrupts ' to curly quote.)
Date: Wed, 31 May 2017 01:43:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#23425: master branch: `message' wrongly corrupts ' to curly quote.

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 23425 <at> debbugs.gnu.org.

-- 
23425: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23425
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Glenn Morris <rgm <at> gnu.org>
Cc: acm <at> muc.de, Eli Zaretskii <eliz <at> gnu.org>, 23425-done <at> debbugs.gnu.org
Subject: Re: bug#23425: master branch: `message' wrongly corrupts ' to curly
 quote.
Date: Tue, 30 May 2017 18:42:00 -0700

On 05/30/2017 06:07 PM, Glenn Morris wrote:
> A year has passed. Is this report still relevant?

No, as the patch I installed into master a year ago appears to have 
fixed the problem by supporting Alan's original request in Bug#23425#26 
of having a value for text-quoting-style that would "suppress all 
substitution of quotes". (setq text-quoting-style 'grave) now has the 
desired effect. Closing.

[Message part 3 (message/rfc822, inline)]

From: Alan Mackenzie <acm <at> muc.de>
To: bug-gnu-emacs <at> gnu.org
Subject: master branch: `message' wrongly corrupts ' to curly quote.
Date: Mon, 2 May 2016 14:55:17 +0000

Hello, Emacs.

In the following function:

(defun replay-parse-state-state ()
  (message
   (concat "(setq "
    (mapconcat
     (lambda (arg)
       (format "%s %s%s" (car arg)
	       (if (atom (cdr arg)) "" "'")  <==================
	       (if (markerp (cdr arg))
		   (format "(copy-marker %s)" (marker-position (cdr arg)))
		 (cdr arg))))
     c-parse-state-state "  ")
    ")")))

, the quote mark on the marked line is an ASCII quote, 0x27.  When this
function runs in the Emacs master branch under X-Windows, the output of
this quote gets corrupted into a curly quote, as follows:

                    |
                    v
(setq c-state-cache ’((32429 . 33731) 795 365)  c-state-cache-good-pos
33731  c-state-nonlit-pos-cache ’(53334 50334 47334 44334 41334 38334
35334 32334 29099 26099 23099 20099 17099 13993 10731 7641)
c-state-nonlit-pos-cache-limit 53334  c-state-semi-nonlit-pos-cache
’(32334 29099 26099 23099 20099 17099 13993 10731 7641)
c-state-semi-nonlit-pos-cache-limit 32334  c-state-brace-pair-desert nil
c-state-point-min 1  c-state-point-min-lit-type nil
c-state-point-min-lit-start nil  c-state-min-scan-pos 1
c-state-old-cpp-beg nil  c-state-old-cpp-end nil  c-parse-state-point
33733)

When this output is fed back into Emacs with M-:, it produces an obscure
error message.

This has wasted a lot of time identifying the problem, and fruitlessly
searching for a solution in the Emacs and Elisp manuals, etc.

This is a bug.  If a constant ASCII quote is presented to `message' or
`format', it should be processed as such.  This bug might exist in the
emacs-25 branch, too.  If so, could it be corrected there too, please,
before the release?

-- 
Alan Mackenzie (Nuremberg, Germany).

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