Problem with Numbers

I suspect there are slight differences between yacc languages, but I see no way to get numbers to work (the first error) in:
https://github.com/sqljs/node-sqljs/blob/master/doc/ref/savage/sql-92.yacc

This produces an error on the first non-comment line:
%token 0

It appears numbers are not allowed. Nothing from the calc example appears to help.
