Disambiguation between between
Theorem:
(defthm fail-cwsp-when-match-cnl (implies (and (tree-match-element-p tree (element-rulename *c-nl*) *grammar*) (tree-terminatedp tree) (mv-nth 0 (parse-wsp rest-input))) (mv-nth 0 (parse-cwsp (append (tree->string tree) rest-input)))))