combine_children: Combine child and internal child
Description
Binds two parse tables together and arranges them so that the tokens are in
the correct order.
Usage
combine_children(child, internal_child)
Arguments
- child
A parse table or NULL.
- internal_child
A parse table or NULL.
Details
Essentially, this is a wrapper around vctrs::vec_rbind()], but
returns NULL if the result of vctrs::vec_rbind()] is a data frame with
zero rows.