[bug #65980] [troff] diagnose why directory operands can't be opened

[G. Branden Robinson]

Follow-up Comment #5, bug #65980 (group groff):


[comment #1 comment #1:]
> 2.  Use of preprocessors with empty inputs causes the formatter to produce
output that provokes complaints from output drivers.
> 
> Example:
> 

> $ echo . | tbl
> .if !\n(.g .ab GNU tbl requires groff extensions; aborting
> .do if !dTS .ds TS
> .do if !dT& .ds T&
> .do if !dTE .ds TE
> .lf 1 -
> .
> $ echo . | tbl | nroff
> grotty:<standard input>:(<standard input>):6: fatal error: 'V' command
invalid before first 'p' command


> 
> So what's the problem?
> 

> $ echo . | tbl | nroff -Z
> x T utf8
> x res 240 24 40
> x init
> x F -
> x trailer
> V2640
> x stop


> 
> [...]
> I'll branch this second issue off into a new ticket.

See bug #65983.


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