Follow-up Comment #6, bug #51568 (project groff):
There is also warning when gropdf is compiled (and used):
Use of uninitialized value in substitution (s///) at /home/bg/git/groff/gropdf
line 2947, <> line 10056.
Use of uninitialized value in substitution (s///) at /home/bg/git/groff/gropdf
line 2948, <> line 10056.
Use of uninitialized value in substitution (s///) at /home/bg/git/groff/gropdf
line 2949, <> line 10056.
Use of uninitialized value in substitution (s///) at /home/bg/git/groff/gropdf
line 2950, <> line 10056.
And repeated
Source (gropdf):
next if $wd->[0]=~s/\\\|!\|/\\/g;
$wd->[0]=~s/\\/\\\\/g;
$wd->[0]=~s/\(/\\(/g;
$wd->[0]=~s/\)/\\)/g;
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