Follow-up Comment #6, bug #64155 (project groff):
> Is it an error to specify a family where some font styles are missing if the
document never asks to use those styles?
I'd characterize that as a warning. I'd like to see the formatter check for
the existence of all four styles when a family is requested. (Or at startup
if `-f` is specified.)
> 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")
I'd make this a warning too.
And, more realistically, in the case where, on the "dvi" device, someone
specified -fC, thinking they could get something equivalent to the "Courier"
family. But the Computer Modern fonts aren't quite up to that.
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