EDIT: Oh, misunderstood. I know the RNN can do the parens-balancing, and that's why Goldberg said that parens-balancing was impressive, since with his method you'd need to add other hacks around it.
EDIT: Oh, misunderstood. I know the RNN can do the parens-balancing, and that's why Goldberg said that parens-balancing was impressive, since with his method you'd need to add other hacks around it.