Update of bug #68839 (group groff):
Summary: [troff] could be more helpful when `ft` request
given bogus argument => [troff] could be more helpful when `\f` escape
sequence given bogus argument
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Follow-up Comment #1:
Semi-never mind.
The `ft` request can only be (or is better) fixed in this respect if we fix
bug #68818.
But rather than closing this as a duplicate, let's adapt to the `\f` escape
sequence.
$ for v in 1.22.3 1.22.4 1.23.0 1.24.0 1.24.1 1.24.2 HEAD; do echo "---- groff
$v ---"; printf '\\f[\002]\n' | ASAN_OPTIONS=detect_leaks=0
~/groff-$v/bin/groff -z -ww; done
---- groff 1.22.3 ---
<standard input>:1: warning: can't find font `'
---- groff 1.22.4 ---
troff: <standard input>:1: warning: can't find font ''
---- groff 1.23.0 ---
troff:<standard input>:1: warning: cannot select font ''
---- groff 1.24.0 ---
troff:<standard input>:1: warning: cannot select font ''
---- groff 1.24.1 ---
troff:<standard input>:1: warning: cannot select font ''
---- groff 1.24.2 ---
troff:<standard input>:1: warning: cannot select font ''
---- groff HEAD ---
troff:<standard input>:1: error: cannot open font description file '': No such
file or directory
troff:<standard input>:1: warning: cannot select font '' [-w font]
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