[racket] compilation error in parameter.plt

I think you want to use a new definition of pseudo-parameter/c that uses
blame objects -- the code you quote is using old APIs in general. Check out
section 7.7 in the Reference.

But you might also just be able to avoid pseudo-parameters entirely,
depending on how you're using them.

Robby



On Sun, Jan 13, 2013 at 8:14 AM, Răzvan Rotaru <razvan.rotaru at gmail.com>wrote:

>
> Thanks,
>
> I have found out that you can apply your patches to the cache
> (~/.racket/planet/300/5.2.1/cache/) and it works. This way you can at least
> apply the fixes on your local machine. I don't know if and when the cache
> files are refreshed with the version from planet (therefore overwriting my
> patches), but until now the solution looks feasible.
>
> In my case the problem is I don't get any reply from the package owner
> (Dave Herman). Maybe the email address is not valid anymore.
>
> Coming to the first issue, the compilation error is caused by a change in
> the contract api. Here's the code that fails:
>
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ; I had to copy this from collects/scheme/private/contract-guts.ss
> ; because it isn't provided from scheme/contract.
> (define (flat-proj ctc)
>   (let ([pred? ((flat-get ctc) ctc)])
>     (λ (pos neg src-info orig-str)
>       (λ (val)
>         (if (pred? val)
>             val
>             (raise-contract-error
>              val
>              src-info
>              pos
>              orig-str
>              "expected <~a>, given: ~e"
>              ((name-get ctc) ctc)
>              val))))))
>
> (define (pseudo-parameter/c c)
>   (let ([c (coerce-contract pseudo-parameter/c c)])
>     (make-proj-contract
>      `(pseudo-parameter/c ,(contract-name c))
>      (lambda (pos neg src-info name)
>        (let* ([c-proj (if (flat-contract? c)
>                           (flat-proj c)
>                           ((proj-get c) c))]
>               [pos-proj (c-proj pos neg src-info name)]
>               [neg-proj (c-proj neg pos src-info name)])
>            (lambda (p)
>              (let ([getter (pseudo-parameter-getter p)]
>                    [setter (pseudo-parameter-setter p)])
>                (make-pseudo-parameter
>                 (lambda ()
>                   (pos-proj (getter)))
>                 (lambda (x)
>                   (setter (neg-proj x))))))))
>      pseudo-parameter?/first-order)))
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>
> flat-get and proj-get don't exist anymore. I tried to find their
> replacements, but I'm not familiar with the entire contract system, so I'm
> basically wandering in the dark.
>
> Does anybody know how to fix this code?
>
> Thanks,
> Razvan
>
> On 12 January 2013 20:16, Asumu Takikawa <asumu at ccs.neu.edu> wrote:
>
>> On 2013-01-09 14:49:34 +0200, Răzvan Rotaru wrote:
>> >    [2]http://planet.racket-lang.org/trac/ticket/385
>> >    Is there a way to push the fix back into the repository (other than
>> >    emailing the owner)?
>>
>> I think the only way to upload new versions of a package onto PLaneT is
>> to be the package owner. There are two options: you can e-mail the owner
>> a patch or you can fork the package under a new name (this was done with
>> ssax/sxml2 for example).
>>
>> Cheers,
>> Asumu
>>
>
>
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>
>
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