[racket] I think I found a bug in the JITC

I can replicate the error in my build, and I'm working on it.

At Mon, 30 Jan 2012 15:57:32 +0100, Marijn wrote:
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> On 30-01-12 15:21, Erik Dominikus wrote:
> > Source code for reproducing attached. 'racket --version' shows
> > 5.2. I built from source.
> > 
> > The expected result is a list, but Racket gave this error message 
> > instead:
> > 
> > 
> > internal error: flonum position not found
> > 
> > === context === 
> > /kage/racket-5.2/collects/racket/private/stream-cons.rkt:42:0: 
> > stream-force 
> > /kage/racket-5.2/collects/racket/private/stream-cons.rkt:79:0: 
> > stream-null? 
> > /kage/racket-5.2/collects/racket/private/for.rkt:388:2: 
> > unsafe-stream-not-empty? /home/erik/scheme/bug.rkt:12:0: for-loop 
> > /home/erik/scheme/bug.rkt: [running body]
> > 
> > 
> > and upon seeing that message for the first time, I was dumbstruck.
> > I was quite sure that I made no transgression since I was using the
> > library normally as documented, so I took 'internal error' as a
> > bug. After tracing the error message to line 656 of the file 
> > src/racket/src/jitstate.c, I thought the bug is in the JITC. It
> > turns out that disabling the JITC (racket -j) produces the expected
> > result, so I'm somewhat more sure that the bug is in the JITC.
> > 
> > 
> > In advance, I'd like to thank the people who will fix this bug, if
> > it is really a bug.
> 
> Hi Erik,
> 
> I tried reproducing this bug from the attached code and found that it
> works for me with today's master. This may mean that there is a bug in
> the jit compiler only on the specific platform you are on (or that it
> was already fixed), so you should prolly specify which platform you
> are using,
> 
> Marijn
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