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 <<a href="mailto:dave@fallingcanbedeadly.com">dave@fallingcanbedeadly.com</a>> 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 <<a href="mailto:robby@eecs.northwestern.edu">robby@eecs.northwestern.edu</a>> 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 >> <<a href="mailto:dave@fallingcanbedeadly.com">dave@fallingcanbedeadly.com</a>> 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 <<a href="mailto:robby@eecs.northwestern.edu">robby@eecs.northwestern.edu</a>> 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 >>>> <<a href="mailto:dave@fallingcanbedeadly.com">dave@fallingcanbedeadly.com</a>> 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 <a href="http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf">http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf</a> >>>>> 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