Follow-up Comment #1, bug #66111 (group groff):
[comment #0 original submission:]
> $ echo '\[vs]' | groff -z -Tutf8
> $ echo '\[vs]' | groff -z -Tlatin1
> troff:<standard input>:1: warning: special character 'ah' not defined
> The warning is expected, as _ลก_ does not exist in Latin-1. But the
character reported is weird.
>
> Groff 1.22.4 correctly reported "can't find special character 'vs'." The
diagnostic is wrong in 1.23 and git HEAD.
You will find the answer in "fallbacks.tmac".
I think the newer diagnostic is more accurate.
But I agree that its puzzling at first glace, and an easy-to-use resource for
digging into the problem are lacking.
This is one reason I want a `pchar` request (see bug #64004). I envision it
describing how the character identifier was resolved, and possibly dumping it
like a node (where applicable); see the new `pline` request.
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