<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=us-ascii" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 9.00.8112.16434"></HEAD> <BODY> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial>May be the following observation helps:</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial>when running without saving the definitions I get an error.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial>when running after saving all goes well.</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial>Windows 7, DrRacket, version 5.1.3.6--2011-08-28(c97b314/a) [3m]</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=699260216-30082011><FONT color=#0000ff size=2 face=Arial>Jos</FONT></SPAN></DIV><BR> <DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left> <HR tabIndex=-1> <FONT size=2 face=Tahoma><B>From:</B> users-bounces@racket-lang.org [mailto:users-bounces@racket-lang.org] <B>On Behalf Of </B>David Mitchell<BR><B>Sent:</B> martes, 30 de agosto de 2011 16:55<BR><B>To:</B> users@racket-lang.org<BR><B>Subject:</B> Re: [racket] racket/place seems to be incompatible with DrRacket<BR></FONT><BR></DIV> <DIV></DIV>Steps: <DIV><BR></DIV> <DIV>1. Open DrRacket</DIV> <DIV>2. In the definitions window, paste in</DIV> <BLOCKQUOTE style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0px; MARGIN: 0px 0px 0px 40px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; BORDER-TOP: medium none; BORDER-RIGHT: medium none; PADDING-TOP: 0px" class=webkit-indent-blockquote> <DIV> <DIV> <DIV>#lang racket</DIV> <DIV><BR></DIV> <DIV>(define (super-simple)</DIV> <DIV>  (define p</DIV> <DIV>    (place ch</DIV> <DIV>           (place-channel-put ch 5)))</DIV> <DIV>  (place-channel-get p))</DIV></DIV></DIV></BLOCKQUOTE>3. Click the "Run" button in the toolbar <DIV>4. In the REPL, type "(super-simple)"</DIV> <DIV><BR></DIV> <DIV>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)</DIV> <DIV> <DIV><BR></DIV></DIV> <DIV>— Dave<BR> <DIV><BR> <DIV class=gmail_quote>On Tue, Aug 30, 2011 at 7:19 AM, Robby Findler <SPAN dir=ltr><<A href="mailto:robby@eecs.northwestern.edu">robby@eecs.northwestern.edu</A>></SPAN> wrote:<BR> <BLOCKQUOTE style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class=gmail_quote>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.<BR><FONT color=#888888><BR>Robby</FONT> <DIV> <DIV></DIV> <DIV class=h5><BR><BR>On Tuesday, August 30, 2011, David Mitchell <<A href="mailto:dave@fallingcanbedeadly.com" target=_blank>dave@fallingcanbedeadly.com</A>> wrote:<BR>> 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.<BR>><BR>> -- Dave (on the iPhone)<BR>><BR>> On Aug 30, 2011, at 4:44 AM, Robby Findler <<A href="mailto:robby@eecs.northwestern.edu" target=_blank>robby@eecs.northwestern.edu</A>> wrote:<BR>><BR>>> I'm sorry; I was wrong.<BR>>><BR>>> I don't see the behavior you're seeing, tho. If I add parens around<BR>>> 'all-defined-out', and save the file in tmp.rkt, then this is the<BR>>> behavior I see at the command-line racket:<BR>>><BR>>> Welcome to Racket v5.1.3.6.<BR>>>> (require "tmp.rkt")<BR>>>> (super-simple)<BR>>> 5<BR>>><BR>>> and I see similar behavior in DrRacket:<BR>>><BR>>> Welcome to DrRacket, version 5.1.3.6--2011-08-25(7bb8c6c4/d) [3m].<BR>>> Language: racket; memory limit: 128 MB.<BR>>>> (super-simple)<BR>>> 5<BR>>>><BR>>><BR>>> FWIW, in 5.1.3, I get an error that's surprising to me, as I don't see<BR>>> how the sandbox gets involved in this program, but here it is:<BR>>><BR>>> car: expects argument of type <pair>; given '#((module program racket/base))<BR>>><BR>>> === context ===<BR>>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:572:17: ns<BR>>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:584:20<BR>>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:334:0: call-with-limits<BR>>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:564:0: evaluate-program<BR>>> /Applications/Racket<BR>>> v5.1.3/collects/racket/private/more-scheme.rkt:151:2:<BR>>> call-with-break-parameterization<BR>>> /Applications/Racket v5.1.3/collects/racket/sandbox.rkt:704:2: user-process<BR>>> /Applications/Racket v5.1.3/collects/mred/private/wx/common/queue.rkt:430:6<BR>>> /Applications/Racket v5.1.3/collects/mred/private/wx/common/queue.rkt:470:32<BR>>><BR>>> Robby<BR>>><BR>>> On Mon, Aug 29, 2011 at 8:55 PM, David Mitchell<BR>>> <<A href="mailto:dave@fallingcanbedeadly.com" target=_blank>dave@fallingcanbedeadly.com</A>> wrote:<BR>>>> 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?<BR>>>><BR>>>> -- Dave (on the iPhone)<BR>>>><BR>>>> On Aug 29, 2011, at 6:32 PM, Robby Findler <<A href="mailto:robby@eecs.northwestern.edu" target=_blank>robby@eecs.northwestern.edu</A>> wrote:<BR>>>><BR>>>>> I think what's happening is that you're creating a place whose first<BR>>>>> action is to create that same place again (over and over).<BR>>>>><BR>>>>> Robby<BR>>>>><BR>>>>> On Mon, Aug 29, 2011 at 8:17 PM, David Mitchell<BR>>>>> <<A href="mailto:dave@fallingcanbedeadly.com" target=_blank>dave@fallingcanbedeadly.com</A>> wrote:<BR>>>>>> I've been trying to experiment with racket/place, but it seems to have<BR>>>>>> significant incompatibilities with DrRacket. I've defined a module based on<BR>>>>>> a code snippet in <A href="http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf" target=_blank>http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf</A><BR>>>>>> that looks like this:<BR>>>>>><BR>>>>>> #lang racket<BR>>>>>> (provide all-defined-out)<BR>>>>>> (define (fib n)<BR>>>>>>   (define (fib-inner n-remaining i i+1)<BR>>>>>>     (if (= n-remaining 1)<BR>>>>>>         i+1<BR>>>>>>         (fib-inner (- n-remaining 1) i+1 (+ i i+1))))<BR>>>>>>   (if (<= n 0)<BR>>>>>>       0<BR>>>>>>       (fib-inner n 0 1)))<BR>>>>>> (define (start-fib n)<BR>>>>>>   (define p<BR>>>>>>     (place ch<BR>>>>>>            (define n (place-channel-get ch))<BR>>>>>>            (place-channel-put ch (fib n))))<BR>>>>>>   (place-channel-put p n)<BR>>>>>>   p)<BR>>>>>> (define (super-simple)<BR>>>>>>   (define p<BR>>>>>>     (place ch<BR>>>>>>            (place-channel-put ch 5)))<BR>>>>>>   (place-channel-get p))<BR>>>>>><BR>>>>>> If I run racket in my Terminal and load this module, I'm able to use<BR>>>>>> start-fib and super-simple as expected. However, if I define this module in<BR>>>>>> the DrRacket editor and access the functions through the repl, attempts to<BR>>>>>> rec </DIV></DIV></BLOCKQUOTE></DIV><BR></DIV></DIV></BODY></HTML>