Less-than test for characters
(char< x y) is true if and only if the character code of x is less than that of y. See char-code.
The guard for char< specifies that its arguments are characters.
Char< is a Common Lisp function. See any Common Lisp documentation for more information.
Function: char<
(defun char< (x y) (declare (xargs :guard (and (characterp x) (characterp y)))) (< (char-code x) (char-code y)))