Disambiguation between (WSP / VCHAR) and CRLF.
Theorem: fail-wsp/vchar-when-match-crlf
(defthm fail-wsp/vchar-when-match-crlf (implies (and (tree-match-element-p tree (element-rulename *crlf*) *grammar*) (tree-terminatedp tree)) (mv-nth 0 (parse-wsp/vchar (append (tree->string tree) rest-input)))))