What does bison do with undefined tokens?

[James Browning]

> On 08/22/2023 12:09 AM PDT Hal Murray via devel <devel at ntpsec.org> wrote:
> 
>  
> ntpd/ntp_parser.y has this line:
> 
> %token	<Integer>	T_Timingstats
> 
> T_Timingstats is never defined.  All the other similar tokens are defined in 
> ntpd/keyword-gen.c

I think that is a stub definition. It gets written into the
resulting c and h files with a number. Additionally line 658
seems to ensure it get added as a stub option for 'stats'.

Properly the lines should probably be filled out or removed.