Follow-up Comment #5, bug #67612 (group groff): Thanks, Deri, for the succinct how-we-got-here. Might be worth checking whether any other messages also got misclassified in the overhaul; this is just one I happened across.
I do notice an unexpected result from the test case of bug #67616:
$ groff -Tpdf -P--pdfver=1.5 < /dev/null
gropdf: warning: Only pdf versions 1.4 or 1.7 are supported, not '1.5'
$ echo $?
0
This is a case of "may fail to render as desired," since gropdf cannot give
the user what they asked for. However, that's with a null input, so maybe
it's OK: the expected nonzero code comes up with even minimal input:
$ echo 'Yo!' | groff -Tpdf -P--pdfver=1.5 > /dev/null
gropdf: warning: Only pdf versions 1.4 or 1.7 are supported, not '1.5'
$ echo $?
4
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