[racket] racket/place seems to be incompatible with DrRacket

May be the following observation helps:
when running without saving the definitions I get an error.
when running after saving all goes well.
 
Windows 7, DrRacket, version 5.1.3.6--2011-08-28(c97b314/a) [3m]
 
Jos

  _____  

From: users-bounces at racket-lang.org [mailto:users-bounces at racket-lang.org]
On Behalf Of David Mitchell
Sent: martes, 30 de agosto de 2011 16:55
To: users at racket-lang.org
Subject: Re: [racket] racket/place seems to be incompatible with DrRacket


Steps: 

1. Open DrRacket
2. In the definitions window, paste in

#lang racket

(define (super-simple)
  (define p
    (place ch
           (place-channel-put ch 5)))
  (place-channel-get p))

3. Click the "Run" button in the toolbar 
4. In the REPL, type "(super-simple)"

The call to provide is necessary when loading code in the Terminal, but it
doesn't seem necessary with DrRacket. In fact, based on the comment I saw in
IRC about DrRacket reloading the module, I wonder if that has something to
do with it. (although I'm new enough to Racket to not put much stock in my
intuitions)

- Dave


On Tue, Aug 30, 2011 at 7:19 AM, Robby Findler <robby at eecs.northwestern.edu>
wrote:


I'm not seeing bad behavior so probably I'm doing something slightly
differently than you, which is making the difference. If you have the energy
to send a precise set of steps I'm happy to try them on my machine and maybe
that'll help us sort it out.

Robby 


On Tuesday, August 30, 2011, David Mitchell <dave at fallingcanbedeadly.com>
wrote:
> I tried saving the module and putting a require in the DrRacket window,
and that works correctly. I think this will be an acceptable workaround for
the time being, but I'd really like to know more about what's going on.
>
> -- Dave (on the iPhone)
>
> On Aug 30, 2011, at 4:44 AM, Robby Findler <robby at eecs.northwestern.edu>
wrote:
>
>> I'm sorry; I was wrong.
>>
>> I don't see the behavior you're seeing, tho. If I add parens around
>> 'all-defined-out', and save the file in tmp.rkt, then this is the
>> behavior I see at the command-line racket:
>>
>> Welcome to Racket v5.1.3.6.
>>> (require "tmp.rkt")
>>> (super-simple)
>> 5
>>
>> and I see similar behavior in DrRacket:
>>
>> Welcome to DrRacket, version 5.1.3.6--2011-08-25(7bb8c6c4/d) [3m].
>> Language: racket; memory limit: 128 MB.
>>> (super-simple)
>> 5
>>>
>>
>> FWIW, in 5.1.3, I get an error that's surprising to me, as I don't see
>> how the sandbox gets involved in this program, but here it is:
>>
>> car: expects argument of type <pair>; given '#((module program
racket/base))
>>
>> === context ===
>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:572:17: ns
>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:584:20
>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:334:0:
call-with-limits
>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:564:0:
evaluate-program
>> /Applications/Racket
>> v5.1.3/collects/racket/private/more-scheme.rkt:151:2:
>> call-with-break-parameterization
>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:704:2:
user-process
>> /Applications/Racket
v5.1.3/collects/mred/private/wx/common/queue.rkt:430:6
>> /Applications/Racket
v5.1.3/collects/mred/private/wx/common/queue.rkt:470:32
>>
>> Robby
>>
>> On Mon, Aug 29, 2011 at 8:55 PM, David Mitchell
>> <dave at fallingcanbedeadly.com> wrote:
>>> You might have to unpack that a little bit more for me, as I don't see
how that's the case. Additionally, why would it work from Terminal and not
DrRacket?
>>>
>>> -- Dave (on the iPhone)
>>>
>>> On Aug 29, 2011, at 6:32 PM, Robby Findler <robby at eecs.northwestern.edu>
wrote:
>>>
>>>> I think what's happening is that you're creating a place whose first
>>>> action is to create that same place again (over and over).
>>>>
>>>> Robby
>>>>
>>>> On Mon, Aug 29, 2011 at 8:17 PM, David Mitchell
>>>> <dave at fallingcanbedeadly.com> wrote:
>>>>> I've been trying to experiment with racket/place, but it seems to have
>>>>> significant incompatibilities with DrRacket. I've defined a module
based on
>>>>> a code snippet in
http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf
>>>>> that looks like this:
>>>>>
>>>>> #lang racket
>>>>> (provide all-defined-out)
>>>>> (define (fib n)
>>>>>   (define (fib-inner n-remaining i i+1)
>>>>>     (if (= n-remaining 1)
>>>>>         i+1
>>>>>         (fib-inner (- n-remaining 1) i+1 (+ i i+1))))
>>>>>   (if (<= n 0)
>>>>>       0
>>>>>       (fib-inner n 0 1)))
>>>>> (define (start-fib n)
>>>>>   (define p
>>>>>     (place ch
>>>>>            (define n (place-channel-get ch))
>>>>>            (place-channel-put ch (fib n))))
>>>>>   (place-channel-put p n)
>>>>>   p)
>>>>> (define (super-simple)
>>>>>   (define p
>>>>>     (place ch
>>>>>            (place-channel-put ch 5)))
>>>>>   (place-channel-get p))
>>>>>
>>>>> If I run racket in my Terminal and load this module, I'm able to use
>>>>> start-fib and super-simple as expected. However, if I define this
module in
>>>>> the DrRacket editor and access the functions through the repl,
attempts to
>>>>> rec 


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