Update from PR feedback:
Coalesce multiple statement rules into one.
Coalesce multiple constant.number into one.
Update from more PR feedback:
Fix special variables (starting with $)--var must start with $,
i.e. x$y is not a valid special var, but you can have x=$y.
Compiled and tested again with latest changes.
Co-authored-by: James Corey <jc-git@neniam.net>
