(test (null (string< "" "")))
(test (null (string< "a" "")))
(test (= (string< "" "a") 0))
+(test (= (string< "aaa" "aaaaa") 3))
;;; BUG: The compiler will macroexpand the forms below (char str N)
;;; will expand to internal SBCL code instead of our (setf char). It