URL: <https://savannah.gnu.org/bugs/?67770>
Summary: [troff]: nested character classes don't work
Group: GNU roff
Submitter: gbranden
Submitted: Fri 05 Dec 2025 09:49:59 AM UTC
Category: Core
Severity: 3 - Normal
Item Group: Incorrect behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Unlocked
Planned Release: None
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Follow-up Comments:
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Date: Fri 05 Dec 2025 09:49:59 AM UTC By: G. Branden Robinson <gbranden>
...and it looks like they never have.
$ cat ./EXPERIMENTS/nested-character-class.groff
.class [nest1] A
.class [nest2] B\C'[nest1]'
.\"pchar \C'[nest2]'\" infinite loop on groff HEAD
.class [nest3] C\C'[nest2]'
$ ~/groff-1.22.3/bin/groff -ww ./EXPERIMENTS/nested-character-class.groff
./EXPERIMENTS/nested-character-class.groff:4: warning: cyclic nested class
detected while processing character code -1
$ ~/groff-1.22.4/bin/groff -ww ./EXPERIMENTS/nested-character-class.groff
troff: ./EXPERIMENTS/nested-character-class.groff:4: warning: cyclic nested
class detected while processing character code -1
$ ~/groff-1.23.0/bin/groff -ww ./EXPERIMENTS/nested-character-class.groff
troff:./EXPERIMENTS/nested-character-class.groff:4: warning: cyclic nested
class detected while processing character code -1
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