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svn: r15859
This commit is contained in:
Jon Rafkind 2009-09-02 16:59:26 +00:00
parent 9f13cd3766
commit e6b536edba
1 changed files with 5 additions and 5 deletions
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10
collects/scribblings/reference/booleans.scrbl
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@ -188,11 +188,11 @@ values. For opaque structure types, @scheme[equal?] is the same as
@examples[
(define (farm=? farm1 farm2 recursive-equal?)
(and (= (farm-apples farm1)
(farm-apples farm2))
(farm-apples farm2))
(= (farm-oranges farm1)
(farm-oranges farm2))
(farm-oranges farm2))
(= (farm-sheep farm1)
(farm-sheep farm2))))
(farm-sheep farm2))))
(define (farm-hash-1 farm recursive-equal-hash)
(+ (* 10000 (farm-apples farm))
(* 100 (farm-oranges farm))
@ -204,8 +204,8 @@ values. For opaque structure types, @scheme[equal?] is the same as
(* 1 (farm-oranges farm))))
(define-struct farm (apples oranges sheep)
#:property prop:equal+hash
(list farm=? farm-hash-1 farm-hash-2))
#:property prop:equal+hash
(list farm=? farm-hash-1 farm-hash-2))
(define east (make-farm 5 2 20))
(define west (make-farm 18 6 14))
(define north (make-farm 5 20 20))