Thanks. I've pushed a fix.

https://github.com/racket/racket/commit/8c5c8da1a7e8c63460125d5cde3cdc5e1240a09c

Robby

On Sun, Feb 5, 2017 at 3:44 AM, Philip McGrath <phi...@philipmcgrath.com> wrote:
> Contracts created with ->* don't seem to be enforcing their #:pre/desc
> pre-conditions.
>
> Given this program:
>>
>> #lang racket
>> (module private racket
>>   (provide get-apples-allowed?
>>            get-apples)
>>   (define get-apples-allowed?
>>     (make-parameter #f))
>>   (define (get-apples)
>>     'apples))
>> (module broken racket
>>   (require (submod ".." private))
>>   (provide
>>    (contract-out
>>     [rename get-apples broken-get-apples
>>             (->* ()
>>                  ()
>>                  #:pre/desc (or (get-apples-allowed?)
>>                                 "get-apples not allowed")
>>                  any)])))
>> (module working racket
>>   (require (submod ".." private))
>>   (provide
>>    (contract-out
>>     [rename get-apples working-get-apples
>>             (->i ()
>>                  ()
>>                  #:pre/desc () (or (get-apples-allowed?)
>>                                    "get-apples not allowed")
>>                  any)])))
>> (require (submod "." working)
>>          (submod "." broken))
>
>
> Evaluating (working-get-apples) produces an error as expected, but
> evaluating (broken-get-apples) produces 'apples.
>
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