Werner LEMBERG wrote:
>> 5 .if \n[NCS]&!\n[SIP] .nop NCS only.
>>
>> test.t:5: warning: numeric expression expected (got `!')
>
> I suspect that for backwards compatibility with AT&T troff only a
> `leading' exclamation mark – this is, at the very beginning of an
> expression within `.if', `.ie', or `.while' – is allowed. You have to
> split up the compound expressions into simpler ones, see below.
>
> Can you suggest a fix to groff.texinfo to document this better?
I'll try to work something up. Meanwhile, is this something that would break
AT&T troff if groff were to do it right?
If I had the time & skill, I'd code up a .case request.
Larry
