+
+;;; Whoops. Too much optimization in division operators for 0
+;;; divisor.
+(macrolet ((frob (name)
+ `(let ((fn (compile nil '(lambda (x)
+ (declare (optimize speed) (fixnum x))
+ (,name x 0)))))
+ (assert (raises-error? (funcall fn 1) division-by-zero)))))
+ (frob mod)
+ (frob truncate)
+ (frob rem)
+ (frob /)
+ (frob floor)
+ (frob ceiling))