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Fixed bugs in contract construction examples.

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svn: r17963
This commit is contained in:
Carl Eastlund 2010-02-04 02:17:15 +00:00
parent a4a25ba1e9
commit 137f9a3279
1 changed files with 5 additions and 5 deletions
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10
collects/scribblings/reference/contracts.scrbl
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@ -1060,8 +1060,8 @@ flat contracts do not need to supply an explicit projection.
@defexamples[#:eval (contract-eval)
(define int/c
(simple-flat-contract #:name 'int/c #:first-order integer?))
(contract 1 int/c 'positive 'negative)
(contract "not one" int/c 'positive 'negative)
(contract int/c 1 'positive 'negative)
(contract int/c "not one" 'positive 'negative)
(int/c 1)
(int/c "not one")
(define int->int/c
@ -1072,14 +1072,14 @@ flat contracts do not need to supply an explicit projection.
#:projection
(λ (b)
(let ([domain ((contract-projection int/c) (blame-swap b))]
[range ((contract-projection int/c) blame)])
[range ((contract-projection int/c) b)])
(λ (f)
(if (and (procedure? f) (procedure-arity-includes? f 1))
(λ (x) (range (f (domain x))))
(raise-blame-error
b f "expected a function of one argument, got: ~e" f)))))))
(contract "not fun" int->int/c 'positive 'negative)
(define halve (contract (λ (x) (/ x 2)) int->int/c 'positive 'negative))
(contract int->int/c "not fun" 'positive 'negative)
(define halve (contract int->int/c (λ (x) (/ x 2)) 'positive 'negative))
(halve 2)
(halve 1)
(halve 1/2)