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fix extend to handle negative lengths

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svn: r17540
This commit is contained in:
Sam Tobin-Hochstadt 2010-01-07 19:10:43 +00:00
parent 7c9d1b47cf
commit 0044d86271
1 changed files with 1 additions and 1 deletions
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2
collects/unstable/list.ss
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@ -33,7 +33,7 @@
;; Listof[A] Listof[B] B -> Listof[B]
;; pads out t to be as long as s
(define (extend s t extra)
(append t (build-list (- (length s) (length t)) (lambda _ extra))))
(append t (build-list (max 0 (- (length s) (length t))) (lambda _ extra))))
(provide filter-multiple extend)