Re: [racket] error : Attempted to use a higher-order value passed as `Any` in untyped code:

Unfortunatly, not.
I'm building a framework were the user will send data over the 
async-channel, so I didn't know the type in advance, and cannot specify 
more the async-channel...

On 04/20/2018 02:50 PM, Sam Tobin-Hochstadt wrote:
> Can you give a more specific type to what you send on the channel? That 
> will allow Typed Racket to generate a contract that works for your values.
> 
> Sam
> 
> On Fri, Apr 20, 2018, 6:14 AM mailoo <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     Hello,
> 
>     I continue my work with Typed/Racket and Racket, and I now have
>     another problem, with the same error.
> 
>     I try to use in untyped racket a typed async-channel of type Any,
>     and I'm not able to use the higher-order value from this channel.
>     Here is an example code that show this problem :
> 
>     ```
>     #lang racket
> 
>     ; A higher-order value
>     (define add (lambda (x) (+ x 1)))
>     (add 1)
> 
>     ; Untyped is working well
>     (require racket/async-channel)
>     (define untype-p (make-async-channel 10))
>     (async-channel-put untype-p add)
>     (define new-add (async-channel-get untype-p))
>     (display "untype world : ")
>     (displayln (new-add 2))
> 
>     ; Untype <-> type world doesn't work
>     (module port typed/racket
>     (provide build-port (struct-out port))
> 
>     (require typed/racket/async-channel)
> 
>     (struct port ([channel : (Async-Channelof Any)]))
> 
>     (: build-port (-> port))
>     (define (build-port)
>     (port (make-async-channel 10))))
> 
>     (require 'port)
>     (define p (build-port))
> 
>     (async-channel-put (port-channel p) add)
>     (define n-add (async-channel-get (port-channel p)))
> 
>     ; Fail : Attempted to use a higher-order value passed as `Any` in
>     untyped code: #<procedure:add>
>     (n-add 3)
>     ```
> 
>     Do you have an idea how I can use my procedure?
>     I don't know if it's possible, or if it is a limitation of the
>     untyped <-> typed boundary?
> 
>     Thank you in advance,
> 
>     Denis Michiels
> 
> 
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