Follow-up Comment #6, bug#64484 (group groff):
[comment #5 comment #5:]
> Another oddity is that you can invoke the `device` request too early, and it
won't be honored, but can use `\X` anywhere you want.
This turns out to be due to the presence of a break on a line using the \X
escape sequence, because it's delimited. That explanation may not be complete
because this succeeds regardless.
\X'ps: nop'\c
So I guess what's actually happened is that a partially collected line exists
and that's enough to make the output copasetic.
But that means that my plan to make a new fatal error consequent to bug #65138
and also that that is probably a corner case. Generally, you won't issue
device control command with a request but never even once have a partially
collected line in your document.
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