[bug #63149] [troff] confusing diagnostic when delete character in input

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?63149>

                 Summary: [troff] confusing diagnostic when delete character
in input
                 Project: GNU troff
               Submitter: gbranden
               Submitted: Tue 04 Oct 2022 02:16:06 AM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


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Date: Tue 04 Oct 2022 02:16:06 AM UTC By: G. Branden Robinson <gbranden>
Problem observed in groff 1.22.4; probably goes back to the beginning.


$ printf '.af a \177\n' | groff -Tascii
troff: <standard input>:1: bad number register format (got '')


Those empty quotes don't tell us much.  In fact, in groff 1.22.4, if you omit
the register format entirely, you get _no_ diagnostic.


$ printf '.af a \n' | groff -Tascii 2>&1 | grep . || echo EMPTY
EMPTY


I propose to add a token type for this.










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