(and (pair? x)
(number? (car x)) (number? (cdr x))))
+(define-public (number-pair-list? x)
+ (and (list? x)
+ (every number-pair? x)))
+
(define-public (fraction? x)
(and (pair? x)
(index? (car x)) (index? (cdr x))))
(if (null? alist)
"Unknown type"
(if (apply (caar alist) obj)
- (cdar alist)
- (match-predicate obj (cdr alist)))))
+ (cdar alist)
+ (match-predicate obj (cdr alist)))))
(define-public (object-type obj)
(match-predicate obj type-p-name-alist))