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* bug#35119: 26.1; narrow-to-region loses word-start/symbol-start information at end
@ 2019-04-03 11:19 Sam Halliday
  2019-04-03 11:25 ` Eli Zaretskii
  0 siblings, 1 reply; 6+ messages in thread
From: Sam Halliday @ 2019-04-03 11:19 UTC (permalink / raw)
  To: 35119


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:
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ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
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/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

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Memory information:
((conses 16 739335 331995)
 (symbols 48 55040 2)
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-- 
Best regards,
Sam





^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-09-01  9:08 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2019-04-03 11:19 bug#35119: 26.1; narrow-to-region loses word-start/symbol-start information at end Sam Halliday
2019-04-03 11:25 ` Eli Zaretskii
2019-04-03 12:30   ` Sam Halliday
2019-04-03 13:01     ` Sam Halliday
2019-04-03 13:05       ` Sam Halliday
2021-09-01  9:08     ` Lars Ingebrigtsen

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