(defun f (x)
(match x
( ((? x) . ((? y) . _)) (< x 10) (list y 'smaller))
( ((? x) . ((? y) . _)) (> x 10) (list y 'larger))
( _ 'whatever)))
(check (and (eq (f '(0 1 2 3)) '(1 smaller))
(eq (f '(11 9 8 7)) '(9 larger))))
