Lars Ingebrigtsen <larsi@HIDDEN>
to control <at> debbugs.gnu.org.
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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Sam Halliday <sam.halliday@HIDDEN>
Subject: Re: bug#35119: 26.1; narrow-to-region loses word-start/symbol-start
information at end
References: <87y34r1glv.fsf@HIDDEN> <83a7h7e3ex.fsf@HIDDEN>
<CALR_T9CAsUvSkAeMKzTf694g+=-xMqmZEV0_JOFB8RkA1rhH2A@HIDDEN>
Date: Wed, 01 Sep 2021 11:08:41 +0200
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(Sam Halliday's message of "Wed, 3 Apr 2019 13:30:40 +0100")
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Content preview: Sam Halliday <sam.halliday@HIDDEN> writes: > This impacts
me in `looking-back'. Here's an interactive snippet to > demonstrate the
problem (not minimised to`narrow-to-region'): > > (defun look-for-35119 ()
> (interactive) > (if (looking-back > [...]
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Sam Halliday <sam.halliday@HIDDEN> writes:
> This impacts me in `looking-back'. Here's an interactive snippet to
> demonstrate the problem (not minimised to`narrow-to-region'):
>
> (defun look-for-35119 ()
> (interactive)
> (if (looking-back
> (rx (: word-end ":" word-start))
> ;;(rx (: word-end ":"))
> (- (point) 1) 't)
> (message "hit")
> (message "miss")))
>
> in emacs-lisp-mode, which defines : as non-word, interactively
> evaluate look-for-35119 when the point is just after the colon in this
> example text
>
> wibble:wobble
Here's a simpler test case:
(with-temp-buffer
(emacs-lisp-mode)
(insert "wibble:wobble")
(goto-char (point-min))
(search-forward ":")
(if (looking-back "\\>:\\<" nil t)
(message "hit")
(message "miss")))
And, indeed, that fails because
(re-search-backward "\\(?:\\>:\\<\\)\\=" nil t)
fails. There seems to be a general problem with re-search-backward and
these zero-length matches (as you said in a later message).
Here's the test case:
(with-temp-buffer
(emacs-lisp-mode)
(insert "wibble:wobble")
(goto-char (point-min))
(search-forward ":")
(if (re-search-backward ":\\<" nil t)
(message "hit")
(message "miss")))
That is, if we're at the point where this zero-length match should
match, it doesn't. This succeeds:
(with-temp-buffer
(emacs-lisp-mode)
(insert "wibble:wobble")
(goto-char (point-min))
(search-forward ":")
(forward-char 1)
(if (re-search-backward ":\\<" nil t)
(message "hit")
(message "miss")))
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
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From: Sam Halliday <sam.halliday@HIDDEN>
Date: Wed, 3 Apr 2019 14:05:25 +0100
Message-ID: <CALR_T9CtkCpi5dX6-u8uAOb930ooSS10PjHOVmaXXkkK55p5xg@HIDDEN>
Subject: Re: bug#35119: 26.1; narrow-to-region loses word-start/symbol-start
information at end
To: Eli Zaretskii <eliz@HIDDEN>
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To be clear, I still think this is a bug... but I'm now thinking that
the bug is in re-search-forward.
This alternative looking-back works for the example but is broken in other ways
(defun haskell-tng-lexer:greedy-looking-back (regexp lower)
(let ((upper (+ (point) 1)) ;; must be +1 to include zero-lengths
(start lower))
(save-excursion
(catch 'hit
(while (< start upper)
(goto-char start)
(re-search-forward regexp upper 't)
(when (= (point) (- upper 1))
(throw 'hit 't))
(setq start (+ 1 start)))
nil))))
On Wed, 3 Apr 2019 at 14:01, Sam Halliday <sam.halliday@HIDDEN> wrote:
>
> Hmm, on further investigation I think this may just be regexp behaviour.
>
> I came up with this as an alternative to `looking-back'
>
> (defun my-looking-back (regexp lower)
> (let ((upper (point))
> (start lower))
> (save-excursion
> (catch 'hit
> (while (< start upper)
> (goto-char start)
> (re-search-forward regexp upper 't)
> (when (= (point) upper)
> (throw 'hit 't))
> (setq start (+ 1 start)))
> nil))))
>
> and it also fails to match the : in the example. So perhaps limit is
> also excluding the zero-length implied by the subsequent character.
>
> On Wed, 3 Apr 2019 at 13:30, Sam Halliday <sam.halliday@HIDDEN> wrote:
> >
> > Hi Eli,
> >
> > Sorry that was a terrible bug report.
> >
> > This impacts me in `looking-back'. Here's an interactive snippet to
> > demonstrate the problem (not minimised to`narrow-to-region'):
> >
> > (defun look-for-35119 ()
> > (interactive)
> > (if (looking-back
> > (rx (: word-end ":" word-start))
> > ;;(rx (: word-end ":"))
> > (- (point) 1) 't)
> > (message "hit")
> > (message "miss")))
> >
> > in emacs-lisp-mode, which defines : as non-word, interactively
> > evaluate look-for-35119 when the point is just after the colon in this
> > example text
> >
> > wibble:wobble
> >
> > I would expect to see "hit", but we get "miss". To demonstrate that
> > the word-start is the cause of the problem, try the commented regexp
> > and try again, you'll get "hit" but of course this regexp is not what
> > is intended. For example, it would also match in between :: in the
> > following:
> >
> > wibble::wobble
> >
> > The cause is that the `narrow-to-region' call inside `looking-back' is
> > dropping the word-start zero length match at the beginning of wobble.
> > This may or may not be a bug in narrow-to-region, but I'm quite sure
> > it's a bug in `looking-back'. There is most likely a similar example
> > demonstrating that the zero lengths are missing at the start as well
> > as the end.
> >
> > I've tried playing around with multiple alternative implementations of
> > `looking-back' but none are working for me. Probably the best
> > workaround I can think of is to extend the `narrow-to-region' call by
> > one more character at the start and the end. Dealing with the start is
> > easy, we just goto-char limit+1, but dealing with the end is difficult
> > as we need to put an anychar \\. matcher in the doctored regexp and
> > then the match-end is off-by-one from what the user expects, so then
> > we have to doctor that, and then all hell breaks loose.
> >
> > Does that make sense?
> >
> >
> > On Wed, 3 Apr 2019 at 12:25, Eli Zaretskii <eliz@HIDDEN> wrote:
> > >
> > > > From: Sam Halliday <sam.halliday@HIDDEN>
> > > > Date: Wed, 03 Apr 2019 12:19:08 +0100
> > > >
> > > > If the function `narrow-to-region' (as it is in `looking-back') is used
> > > > to restrict the region prior to an invocation of re-search-forward or
> > > > looking-at, then zero length regexp patterns are lost at the boundaries.
> > >
> > > Could you please provide a recipe to reproduce the issue? I'm not
> > > sure I understand what is the problem you are describing.
> > >
> > > Thanks.
bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
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From: Sam Halliday <sam.halliday@HIDDEN>
Date: Wed, 3 Apr 2019 14:01:58 +0100
Message-ID: <CALR_T9BDM_Brq6wELpFUbQLF7Dq3eSpfo8Ktiii=AXMJZhnHcA@HIDDEN>
Subject: Re: bug#35119: 26.1; narrow-to-region loses word-start/symbol-start
information at end
To: Eli Zaretskii <eliz@HIDDEN>
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Hmm, on further investigation I think this may just be regexp behaviour.
I came up with this as an alternative to `looking-back'
(defun my-looking-back (regexp lower)
(let ((upper (point))
(start lower))
(save-excursion
(catch 'hit
(while (< start upper)
(goto-char start)
(re-search-forward regexp upper 't)
(when (= (point) upper)
(throw 'hit 't))
(setq start (+ 1 start)))
nil))))
and it also fails to match the : in the example. So perhaps limit is
also excluding the zero-length implied by the subsequent character.
On Wed, 3 Apr 2019 at 13:30, Sam Halliday <sam.halliday@HIDDEN> wrote:
>
> Hi Eli,
>
> Sorry that was a terrible bug report.
>
> This impacts me in `looking-back'. Here's an interactive snippet to
> demonstrate the problem (not minimised to`narrow-to-region'):
>
> (defun look-for-35119 ()
> (interactive)
> (if (looking-back
> (rx (: word-end ":" word-start))
> ;;(rx (: word-end ":"))
> (- (point) 1) 't)
> (message "hit")
> (message "miss")))
>
> in emacs-lisp-mode, which defines : as non-word, interactively
> evaluate look-for-35119 when the point is just after the colon in this
> example text
>
> wibble:wobble
>
> I would expect to see "hit", but we get "miss". To demonstrate that
> the word-start is the cause of the problem, try the commented regexp
> and try again, you'll get "hit" but of course this regexp is not what
> is intended. For example, it would also match in between :: in the
> following:
>
> wibble::wobble
>
> The cause is that the `narrow-to-region' call inside `looking-back' is
> dropping the word-start zero length match at the beginning of wobble.
> This may or may not be a bug in narrow-to-region, but I'm quite sure
> it's a bug in `looking-back'. There is most likely a similar example
> demonstrating that the zero lengths are missing at the start as well
> as the end.
>
> I've tried playing around with multiple alternative implementations of
> `looking-back' but none are working for me. Probably the best
> workaround I can think of is to extend the `narrow-to-region' call by
> one more character at the start and the end. Dealing with the start is
> easy, we just goto-char limit+1, but dealing with the end is difficult
> as we need to put an anychar \\. matcher in the doctored regexp and
> then the match-end is off-by-one from what the user expects, so then
> we have to doctor that, and then all hell breaks loose.
>
> Does that make sense?
>
>
> On Wed, 3 Apr 2019 at 12:25, Eli Zaretskii <eliz@HIDDEN> wrote:
> >
> > > From: Sam Halliday <sam.halliday@HIDDEN>
> > > Date: Wed, 03 Apr 2019 12:19:08 +0100
> > >
> > > If the function `narrow-to-region' (as it is in `looking-back') is used
> > > to restrict the region prior to an invocation of re-search-forward or
> > > looking-at, then zero length regexp patterns are lost at the boundaries.
> >
> > Could you please provide a recipe to reproduce the issue? I'm not
> > sure I understand what is the problem you are describing.
> >
> > Thanks.
bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
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In-Reply-To: <83a7h7e3ex.fsf@HIDDEN>
From: Sam Halliday <sam.halliday@HIDDEN>
Date: Wed, 3 Apr 2019 13:30:40 +0100
Message-ID: <CALR_T9CAsUvSkAeMKzTf694g+=-xMqmZEV0_JOFB8RkA1rhH2A@HIDDEN>
Subject: Re: bug#35119: 26.1; narrow-to-region loses word-start/symbol-start
information at end
To: Eli Zaretskii <eliz@HIDDEN>
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Hi Eli,
Sorry that was a terrible bug report.
This impacts me in `looking-back'. Here's an interactive snippet to
demonstrate the problem (not minimised to`narrow-to-region'):
(defun look-for-35119 ()
(interactive)
(if (looking-back
(rx (: word-end ":" word-start))
;;(rx (: word-end ":"))
(- (point) 1) 't)
(message "hit")
(message "miss")))
in emacs-lisp-mode, which defines : as non-word, interactively
evaluate look-for-35119 when the point is just after the colon in this
example text
wibble:wobble
I would expect to see "hit", but we get "miss". To demonstrate that
the word-start is the cause of the problem, try the commented regexp
and try again, you'll get "hit" but of course this regexp is not what
is intended. For example, it would also match in between :: in the
following:
wibble::wobble
The cause is that the `narrow-to-region' call inside `looking-back' is
dropping the word-start zero length match at the beginning of wobble.
This may or may not be a bug in narrow-to-region, but I'm quite sure
it's a bug in `looking-back'. There is most likely a similar example
demonstrating that the zero lengths are missing at the start as well
as the end.
I've tried playing around with multiple alternative implementations of
`looking-back' but none are working for me. Probably the best
workaround I can think of is to extend the `narrow-to-region' call by
one more character at the start and the end. Dealing with the start is
easy, we just goto-char limit+1, but dealing with the end is difficult
as we need to put an anychar \\. matcher in the doctored regexp and
then the match-end is off-by-one from what the user expects, so then
we have to doctor that, and then all hell breaks loose.
Does that make sense?
On Wed, 3 Apr 2019 at 12:25, Eli Zaretskii <eliz@HIDDEN> wrote:
>
> > From: Sam Halliday <sam.halliday@HIDDEN>
> > Date: Wed, 03 Apr 2019 12:19:08 +0100
> >
> > If the function `narrow-to-region' (as it is in `looking-back') is used
> > to restrict the region prior to an invocation of re-search-forward or
> > looking-at, then zero length regexp patterns are lost at the boundaries.
>
> Could you please provide a recipe to reproduce the issue? I'm not
> sure I understand what is the problem you are describing.
>
> Thanks.
bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
Full text available.Received: (at 35119) by debbugs.gnu.org; 3 Apr 2019 11:25:36 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Apr 03 07:25:36 2019 Received: from localhost ([127.0.0.1]:42127 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1hBe1Q-0001Hr-BU for submit <at> debbugs.gnu.org; Wed, 03 Apr 2019 07:25:36 -0400 Received: from eggs.gnu.org ([209.51.188.92]:37549) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1hBe1O-0001Hf-Oh for 35119 <at> debbugs.gnu.org; Wed, 03 Apr 2019 07:25:35 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:51895) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <eliz@HIDDEN>) id 1hBe1J-00050r-Fh; Wed, 03 Apr 2019 07:25:29 -0400 Received: from [176.228.60.248] (port=2454 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1hBe1I-0003pQ-KM; Wed, 03 Apr 2019 07:25:29 -0400 Date: Wed, 03 Apr 2019 14:25:42 +0300 Message-Id: <83a7h7e3ex.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Sam Halliday <sam.halliday@HIDDEN> In-reply-to: <87y34r1glv.fsf@HIDDEN> (message from Sam Halliday on Wed, 03 Apr 2019 12:19:08 +0100) Subject: Re: bug#35119: 26.1; narrow-to-region loses word-start/symbol-start information at end References: <87y34r1glv.fsf@HIDDEN> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 35119 Cc: 35119 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) > From: Sam Halliday <sam.halliday@HIDDEN> > Date: Wed, 03 Apr 2019 12:19:08 +0100 > > If the function `narrow-to-region' (as it is in `looking-back') is used > to restrict the region prior to an invocation of re-search-forward or > looking-at, then zero length regexp patterns are lost at the boundaries. Could you please provide a recipe to reproduce the issue? I'm not sure I understand what is the problem you are describing. Thanks.
bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
Full text available.Received: (at submit) by debbugs.gnu.org; 3 Apr 2019 11:19:24 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Apr 03 07:19:24 2019 Received: from localhost ([127.0.0.1]:42122 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1hBdvQ-00018R-8P for submit <at> debbugs.gnu.org; Wed, 03 Apr 2019 07:19:24 -0400 Received: from eggs.gnu.org ([209.51.188.92]:36545) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <sam.halliday@HIDDEN>) id 1hBdvN-00018D-PN for submit <at> debbugs.gnu.org; Wed, 03 Apr 2019 07:19:22 -0400 Received: from lists.gnu.org ([209.51.188.17]:46789) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <sam.halliday@HIDDEN>) id 1hBdvI-0005D6-LI for submit <at> debbugs.gnu.org; Wed, 03 Apr 2019 07:19:16 -0400 Received: from eggs.gnu.org ([209.51.188.92]:50921) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <sam.halliday@HIDDEN>) id 1hBdvG-00079m-Mc for bug-gnu-emacs@HIDDEN; Wed, 03 Apr 2019 07:19:16 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,FREEMAIL_FROM, URIBL_BLOCKED autolearn=disabled version=3.3.2 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <sam.halliday@HIDDEN>) id 1hBdvE-00056l-Ts for bug-gnu-emacs@HIDDEN; Wed, 03 Apr 2019 07:19:14 -0400 Received: from mail-wr1-x429.google.com ([2a00:1450:4864:20::429]:35372) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from <sam.halliday@HIDDEN>) id 1hBdvE-00055K-IJ for bug-gnu-emacs@HIDDEN; Wed, 03 Apr 2019 07:19:12 -0400 Received: by mail-wr1-x429.google.com with SMTP id w1so20828820wrp.2 for <bug-gnu-emacs@HIDDEN>; Wed, 03 Apr 2019 04:19:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:mime-version; bh=fR0oZjb5zdqtdckyxsIyeRhQT0y8vqgK7Q3sOZKvdas=; b=tbEpgKqY4Zk+2ikkXrL8eHsGkCpfVI7a8HiVT715IK3OT4msemzvG27iVWqu9crBYB DGSz70nFLU6XMq97wt4+fRh6UnSfi/mTEvjbyKzX0UQiqk9g4V9i+Fxaap5FcNj7zPB9 0R5xtj4eEdV9/q4yVdF7PXhHoA+T6xw10uMc4kud7EvcF+WXnppwEuGGF5BNOYu1hJdc hnNgJYHNTm1WFG9Adj7noI9lGHaqDbt8aGRBhvVNtyvX8GVu67MJ0YndJMj0HbuVHKpO VxgjsDdb8xLpBM6l6bvqehtT+/LcgERA5m8syAETUEb0c1pdcAXGi0A5VVMD8hHRSWBJ zOsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:mime-version; bh=fR0oZjb5zdqtdckyxsIyeRhQT0y8vqgK7Q3sOZKvdas=; b=pc8Tdb4Nd8fNb/kURwXARUFsOpOXbUDD9H9PT1GoqBOdNbl3jE8Mdp9w4IBB7/GPyF DNJg+voECpYPxeoyirgS+QHr09pFkRuunFBOcUKbLLhFPU8U8SD/MieAT/omRM7M2T7s ngqTlqNLoIL8OwwX2mTgi/T9cc2owjyf0ooq+u/VsOxH9QpINiM5wJhB6HTQHQAwLS9Z MuvZha/ld3frMfhfARv35jkSojPXF9CGd7X9yidhCuf9yRsqZDuLplabKHz5O7CHLKPL 76LwJT3DNs9Y9jv+49PMSuG+rfIaaETc1TRaruV2mh6xd1h7q9uHD+zcWvPFbgiLDf0a o4eA== X-Gm-Message-State: APjAAAVhQnEHG7Lqs0x7YxjGxnIB/VR9GWFqm1jk/RNUkUfc+dMgWKty QjjjuHgj7k3woVjQxskQSrHNclb6 X-Google-Smtp-Source: APXvYqy8vZJ0VDpCBUhsCNPh+daY4+pTPj2F856lESyLaos64ISEo0EWkbuy2hLsIAaFx76//olMDQ== X-Received: by 2002:adf:afd7:: with SMTP id y23mr47604700wrd.254.1554290351005; Wed, 03 Apr 2019 04:19:11 -0700 (PDT) Received: from Samurai ([2a00:23c6:c305:7500:1e1b:dff:fe06:d7ff]) by smtp.gmail.com with ESMTPSA id q19sm12024144wmq.23.2019.04.03.04.19.09 for <bug-gnu-emacs@HIDDEN> (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 Apr 2019 04:19:09 -0700 (PDT) From: Sam Halliday <sam.halliday@HIDDEN> X-Google-Original-From: Sam Halliday <Sam.Halliday@HIDDEN> To: bug-gnu-emacs@HIDDEN Subject: 26.1; narrow-to-region loses word-start/symbol-start information at end Date: Wed, 03 Apr 2019 12:19:08 +0100 Message-ID: <87y34r1glv.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::429 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.0 (/) If the function `narrow-to-region' (as it is in `looking-back') is used to restrict the region prior to an invocation of re-search-forward or looking-at, then zero length regexp patterns are lost at the boundaries. It is unclear if this is a bug or an undocumented feature, but it has consequences for lexers that must operate backwards (such as those used by SMIE). In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.7) of 2019-03-17 built on juergen Windowing system distributor 'The X.Org Foundation', version 11.0.12004000 System Description: Arch Linux Recent messages: Mark set You did not specify a variable Type "q" to restore previous buffer. [2 times] C-x <down> is undefined funcall-interactively: Beginning of buffer [2 times] Quit Mark set Quit Configured using: 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-modules 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES THREADS LIBSYSTEMD LCMS2 Important settings: value of $LANG: en_GB.utf8 locale-coding-system: utf-8-unix Major mode: Emacs-Lisp Minor modes in effect: auto-insert-mode: t global-magit-file-mode: t diff-auto-refine-mode: t magit-auto-revert-mode: t global-git-commit-mode: t async-bytecomp-package-mode: t whitespace-mode: t rainbow-delimiters-mode: t smartparens-strict-mode: t smartparens-mode: t company-mode: t yas-minor-mode: t rainbow-mode: t show-paren-mode: t flycheck-mode: t global-hl-todo-mode: t hl-todo-mode: t shell-dirtrack-mode: t projectile-mode: t flx-ido-mode: t ido-everywhere: t persistent-scratch-autosave-mode: t global-subword-mode: t subword-mode: t save-place-mode: t global-auto-revert-mode: t override-global-mode: t eldoc-mode: t mouse-wheel-mode: t prettify-symbols-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-compression-mode: t buffer-read-only: t column-number-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: /home/fommil/.emacs.d/elpa/hydra-0.14.0/lv hides /home/fommil/.emacs.d/elpa/lv-0.14.0/lv /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch hides /usr/share/emacs/site-lisp/notmuch /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-wash hides /usr/share/emacs/site-lisp/notmuch-wash /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-tree hides /usr/share/emacs/site-lisp/notmuch-tree /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-tag hides /usr/share/emacs/site-lisp/notmuch-tag /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-show hides /usr/share/emacs/site-lisp/notmuch-show /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-query hides /usr/share/emacs/site-lisp/notmuch-query /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-print hides /usr/share/emacs/site-lisp/notmuch-print /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-parser hides /usr/share/emacs/site-lisp/notmuch-parser /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-mua hides /usr/share/emacs/site-lisp/notmuch-mua /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-message hides /usr/share/emacs/site-lisp/notmuch-message /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-maildir-fcc hides /usr/share/emacs/site-lisp/notmuch-maildir-fcc /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-lib hides /usr/share/emacs/site-lisp/notmuch-lib /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-jump hides /usr/share/emacs/site-lisp/notmuch-jump /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-hello hides /usr/share/emacs/site-lisp/notmuch-hello /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-draft hides /usr/share/emacs/site-lisp/notmuch-draft /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-crypto hides /usr/share/emacs/site-lisp/notmuch-crypto /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-compat hides /usr/share/emacs/site-lisp/notmuch-compat /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-company hides /usr/share/emacs/site-lisp/notmuch-company /home/fommil/.emacs.d/elpa/notmuch-0.28.3/notmuch-address hides /usr/share/emacs/site-lisp/notmuch-address /home/fommil/.emacs.d/elpa/notmuch-0.28.3/coolj hides /usr/share/emacs/site-lisp/coolj Features: (shadow sort mail-extr emacsbug sendmail completion cl-print debug hippie-exp tabify help-at-pt finder lisp-mnt jka-compr eieio-opt speedbar sb-image ezimage dframe help-fns radix-tree pulse git-gutter haskell-doc inf-haskell haskell-decl-scan haskell haskell-completions haskell-load haskell-commands highlight-uses-mode haskell-modules haskell-sandbox haskell-navigate-imports haskell-repl haskell-svg haskell-collapse hideshow haskell-debug haskell-interactive-mode haskell-presentation-mode haskell-hoogle haskell-process haskell-session sql view ag vc-svn find-dired vc-git smartparens-javascript js smartparens-html sgml-mode dom goto-chg misearch multi-isearch network-stream starttls url-cache github-review s bug-reference highlight-symbol magit-extras yatemplate autoinsert magit-submodule magit-obsolete magit-blame magit-stash magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote magit-commit magit-sequence magit-notes magit-worktree magit-tag magit-merge magit-branch magit-reset magit-collab ghub-graphql treepy graphql ghub url-http tls gnutls url-gw nsm url-auth url url-proxy url-privacy url-expand url-methods url-history url-cookie url-domsuf url-util mailcap let-alist magit-files magit-refs magit-status magit magit-repos magit-apply magit-wip magit-log which-func imenu magit-diff smerge-mode diff-mode magit-core magit-autorevert magit-process magit-margin magit-mode git-commit magit-git magit-section magit-utils magit-popup crm log-edit message rmc puny rfc822 mml mml-sec epa derived epg gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log with-editor async-bytecomp async server whitespace rainbow-delimiters smartparens-config smartparens-text smartparens-haskell smartparens company-oddmuse company-keywords company-etags company-gtags company-dabbrev-code company-dabbrev company-files company-capf company-cmake company-xcode company-clang company-semantic company-eclim company-template company-bbdb company yasnippet rainbow-mode paren elec-pair intellij-theme darcula-theme ox-gfm ox-md ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree generator org org-macro org-footnote org-pcomplete org-list org-faces org-entities org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-comint org-loaddefs cal-menu calendar cal-loaddefs ob-exp ob-core org-compat ob-eval org-macs graphviz-dot-mode package-utils pcase fommil-manuscripts fommil-scala cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs fommil-haskell hlint-refactor haskell-compile haskell-mode haskell-cabal haskell-utils haskell-font-lock haskell-indentation haskell-string haskell-sort-imports haskell-lexeme haskell-align-imports haskell-compat haskell-complete-module haskell-ghc-support noutline outline flymake-proc flymake warnings etags dabbrev haskell-customize fommil-email erc-hl-nicks color erc-button erc-fill erc-stamp wid-edit erc-goodies erc erc-backend erc-compat pp re-builder flycheck-cask flycheck json map find-func rx subr-x dash cl hydra lv hl-todo tramp-cache tramp-sh tramp tramp-compat tramp-loaddefs trampver ucs-normalize shell pcomplete parse-time format-spec projectile grep compile comint ansi-color ibuf-ext ibuffer ibuffer-loaddefs thingatpt flx-ido advice flx ido persistent-scratch midnight xref project ring dired dired-loaddefs diminish cap-words superword subword edmacro kmacro cl-extra help-mode saveplace autorevert filenotify use-package use-package-ensure use-package-delight use-package-diminish use-package-bind-key bind-key easy-mmode use-package-core finder-inf ess-generics info package easymenu epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote dbusbind inotify lcms2 dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 739335 331995) (symbols 48 55040 2) (miscs 40 697 5902) (strings 32 200805 34113) (string-bytes 1 5847037) (vectors 16 94852) (vector-slots 8 2205971 335526) (floats 8 388 2086) (intervals 56 9116 3117) (buffers 992 39)) -- Best regards, Sam
Sam Halliday <sam.halliday@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#35119; Package emacs.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.