[racket] DrRacket crashes when I try to evaluate something

Thanks to Alan's helpful core file, we've fixed the bug that caused
this crash.

At Tue, 3 May 2011 12:32:45 -0600, Matthew Flatt wrote:
> At Mon, 2 May 2011 21:47:15 -0400, "Alan R. Bleier" wrote:
> > Now in beginning student mode when I press enter after (+ 5 5) in the lower 
> > window, DrRacket crashes.
> > 
> > This is DrRacket 5.1 (5.1) on Mac OS X 10.6.7
> 
> Thanks for the crash report. It looks like something is going wrong
> inside the graphics or GUI binding (again), where an incorrect argument
> is supplied to a library function. Unfortunately, I can't tell from the
> crash report which function or what sort of incorrect argument.
> 
> You could try the latest release, v5.1.1, but I'm not optimistic (in
> part because it didn't help last time).
> 
> 
> A core file might give me enough information to make progress. Can you
> try running with core dump enabled, so that a file is written to
> "/cores" that you could send to me?
> 
> http://developer.apple.com/library/mac/technotes/tn2004/tn2124.html#SECCOREDUMPS
> 
> 
> Thanks,
> Matthew
> 
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