(sb-xc:subtypep '(function) '(function (t &rest t)))
(assert (not yes))
(assert win))
+;; Used to run out of stack.
+(multiple-value-bind (yes win)
+ (sb-xc:subtypep 'null '(or unk0 unk1))
+ (assert (not yes))
+ (assert (not win)))
(multiple-value-bind (yes win)
(sb-xc:subtypep '(and function instance) nil)