+
+#+sb-eval
+(assert-t-t
+ (subtypep '(and function (not compiled-function)
+ (not sb-eval:interpreted-function))
+ nil))
+
+;;; weakening of union type checks
+(defun weaken-union-1 (x)
+ (declare (optimize speed))
+ (car x))
+(multiple-value-bind (res err)
+ (ignore-errors (weaken-union-1 "askdjhasdkj"))
+ (assert (not res))
+ (assert (typep err 'type-error)))
+(defun weaken-union-2 (x)
+ (declare (optimize speed)
+ (type (or cons fixnum) x))
+ (etypecase x
+ (fixnum x)
+ (cons
+ (setf (car x) 3)
+ x)))
+(multiple-value-bind (res err)
+ (ignore-errors (weaken-union-2 "asdkahsdkhj"))
+ (assert (not res))
+ (assert (typep err 'type-error))
+ (assert (or (equal '(or cons fixnum) (type-error-expected-type err))
+ (equal '(or fixnum cons) (type-error-expected-type err)))))
+