Follow-up Comment #4, bug #67408 (group groff): My used script was a mess.
New experiments.
groff --version:
GNU groff version 1.23.0
Copyright (C) 2022 Free Software Foundation, Inc.
GNU groff comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of groff and its subprograms
under the terms of the GNU General Public License.
For more information about these matters, see the file
named COPYING.
called subprograms:
GNU grops (groff) version 1.23.0
GNU troff (groff) version 1.23.0
-.-
groff -C -ms -ww -b -z /dev/null
groff ms macros do not work in compatibility mode; aborting
-.-
test-groff.master -C -ms -ww -b -z /dev/null
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':28
troff:/home/bg/git/groff/build/../tmac/s.tmac:28: warning: missing closing
delimiter in output comparison operator; expected character '1', got a
newline
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':31
troff:/home/bg/git/groff/build/../tmac/s.tmac:31: warning: missing closing
delimiter in output comparison operator; expected character '1', got a
newline
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':34
troff:/home/bg/git/groff/build/../tmac/s.tmac:34: warning: conditional
operator 'r' used in compatibility mode
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':37
troff:/home/bg/git/groff/build/../tmac/s.tmac:37: warning: name 'ms' not
defined
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':38
troff:/home/bg/git/groff/build/../tmac/s.tmac:38: warning: expected numeric
expression, got character 'd'
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':39
troff:/home/bg/git/groff/build/../tmac/s.tmac:39: warning: expected numeric
expression, got character 'd'
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':49
troff:/home/bg/git/groff/build/../tmac/s.tmac:49: warning: name '[' not
defined
troff: backtrace: file '/home/bg/git/groff/build/../tmac/s.tmac':142
troff:/home/bg/git/groff/build/../tmac/s.tmac:142: warning: register '[' not
defined
troff:/home/bg/git/groff/build/../tmac/s.tmac:44: error: end of file while
defining macro '@d'
-.-
The culprit is the ".if !..."
heirloom's nroff shows
echo '.if !\n(.C .tm .C is not defined' | heirloom-nroff
.C is not defined
-.-
These redefinitions of delimiters are against productivity, against
evolution.
They also reduce the freedom of choice.
They also break the mission statement of groff.
They should all be removed.
GNU groff should not be made to be both old and new.
[The Unix philosophy: "Small is beautiful", "Make each program do one
thing well", and so on]
The compatibility mode is abused.
It was introduced, when new requests were introduced with longer names
than two characters.
Old troff allowed skipping a space between a request and its argument.
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