+ (test (not (rassoc 1 alist)))
+ (test (equal (assoc 3 alist :test-not #'=) '(1 . 2)))
+ (test (equal (rassoc 4 alist :test-not #'=) '(1 . 2)))
+ (test (equal (assoc 1 alist :key (lambda (x) (/ x 3))) '(3 . 4)))
+ (test (equal (rassoc 2 alist :key (lambda (x) (/ x 2))) '(3 . 4))))