Tree matching theorem for parse-*cwsp-cnl.
Theorem:
(defthm tree-match-of-parse-*cwsp-cnl (b* (((mv error? tree? &) (parse-*cwsp-cnl input))) (implies (and (not error?) (equal element (!_ (/_ (*_ *c-wsp*) *c-nl*)))) (tree-match-element-p tree? element *grammar*))))