[bug #64155] specifying -fZD on command line generates warnings

[Dave]

Follow-up Comment #5, bug #64155 (project groff):

[comment #3 comment #3:]
> Possibly a search for the requisite styles could be undertaken
> upon use of the `-f` flag or `fam` request, errors thrown for
> any that are missing, and the option or request ignored.

Hmm, that raises a couple of interesting questions.

Is it an error to specify a family where some font styles are missing if the
document never asks to use those styles?

Is it an error to specify a family where _all_ font styles are missing if the
document never actually uses that family? (e.g., specifying "-fZD" on the
command line to process a document whose first line is ".fam T")


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