[bug #68420] Using .cc ' causes Assertion failed: (assignment_worked), function assign_control_character_request

URL:
  <https://savannah.gnu.org/bugs/?68420>

                 Summary: Using .cc ' causes Assertion failed:
(assignment_worked), function assign_control_character_request
                   Group: GNU roff
               Submitter: mlw
               Submitted: Tue 02 Jun 2026 03:01:01 PM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Crash/Unresponsive
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Unlocked
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Tue 02 Jun 2026 03:01:01 PM UTC By: Martin <mlw>
I am running the groff-1.24.1_1 package on FreeBSD 14.4.

Running this:


groff -Tascii -me <<END
H??Subject: this is an example message
.cc '
.
'cc
END


gives an error followed by an abort:


troff:x.me:2: error: ignoring control character change request; the no-break
control character is already "'"
Assertion failed: (assignment_worked), function
assign_control_character_request, file src/roff/troff/input.cpp, line 298.
grotty:<standard input>: warning: no final 'x stop' command
groff: error: troff: Abort trap (core dumped)


I don't know if this is sensible input, but I found it in the documentation
for sendmail 8.18.2 (doc/op/op.me).  The intent is to put a . in the output
and this works in groff 1.23.0.








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