Package: emacs-common Version: 1:26.1+1-3.3 Severity: normal Tags: upstream Forwarded: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16368
Open a file in cperl mode containing the following line: /(\d{4})(?: +){2}/; e.g.: "emacs -Q file" then M-x cperl-mode <RET> Put the cursor over the second opening brace, and type <DEL> several times to delete what is before "{2}". When one types <DEL> at this point: /(\d{4})(?:{2}/; ^cursor Emacs freezes. One can type C-g to interrupt. One can also reproduce the bug by typing: /(\d{4})(?{2 Emacs freezes before the "2" appears. Note: This was the old Debian bug 734325. It is different from bug 911573, which is fixed upstream (I could test), but this one still occurs. -- System Information: Debian Release: bullseye/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.2.0-2-amd64 (SMP w/12 CPU cores) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages emacs-common depends on: ii emacsen-common 3.0.4 ii install-info 6.6.0.dfsg.1-2 Versions of packages emacs-common recommends: ii emacs-el 1:26.1+1-3.3 Versions of packages emacs-common suggests: ii emacs-common-non-dfsg 1:26.1+1-1 ii ncurses-term 6.1+20190803-1 -- no debconf information -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)