+(assert (ctypep :x86 (specifier-type '(satisfies keywordp))))
+(assert (type= (specifier-type '(member :x86))
+ (specifier-type '(and (member :x86) (satisfies keywordp)))))
+(let* ((type1 (specifier-type '(member :x86)))
+ (type2 (specifier-type '(or keyword null)))
+ (isect (type-intersection type1 type2)))
+ (assert (type= isect type1))
+ (assert (type= isect (type-intersection type2 type1)))
+ (assert (type= isect (type-intersection type2 type1 type2)))
+ (assert (type= isect (type-intersection type1 type1 type2 type1)))
+ (assert (type= isect (type-intersection type1 type2 type1 type2))))
+(let* ((type1 (specifier-type 'keyword))
+ (type2 (specifier-type '(or keyword null)))
+ (isect (type-intersection type1 type2)))
+ (assert (type= isect type1))
+ (assert (type= isect (type-intersection type2 type1)))
+ (assert (type= isect (type-intersection type2 type1 type2)))
+ (assert (type= isect (type-intersection type1 type1 type2 type1)))
+ (assert (type= isect (type-intersection type1 type2 type1 type2))))
+(assert (csubtypep (specifier-type '(or (single-float -1.0 1.0)
+ (single-float 0.1)))
+ (specifier-type '(or (real -1 7)
+ (single-float 0.1)
+ (single-float -1.0 1.0)))))
+(assert (not (csubtypep (specifier-type '(or (real -1 7)
+ (single-float 0.1)
+ (single-float -1.0 1.0)))
+ (specifier-type '(or (single-float -1.0 1.0)
+ (single-float 0.1))))))
+
+(assert (sb-xc:typep #\, 'character))
+(assert (sb-xc:typep #\@ 'character))
+
+(assert (type= (type-intersection (specifier-type '(member #\a #\c #\e))
+ (specifier-type '(member #\b #\c #\f)))
+ (specifier-type '(member #\c))))