[racket] Exception Stack Trace Troubles

It doesn't produce a stack trace of DrRacket.

Also, it doesn't produce a stack trace if I include the errortrace on
the command line.

:(
--
Chad Albers


On Mon, Jun 25, 2012 at 2:29 AM, Michael Wilber <mwilber at uccs.edu> wrote:
> If I understand correctly, by default, Racket doesn't provide forms with
> stack trace information when running from the CLI by default. Does it
> work from within DrRacket? If so, look into the errortrace module, or
> add (require errortrace) to the top of the .rkt, or run it like this:
> racket -l errortrace test.rkt
>
> On Sun, 24 Jun 2012 22:01:02 +0900, Chad Albers <calbers at neomantic.com> wrote:
>> Hi Eli,
>>
>> Thanks for you help.  Unfortunately, it doesn't seem to work.  I
>> literally cut the code and pasted in a rkt file with #lang racket at
>> the top.  I ran it with the racket CLI, and received: '()
>>
>> Should I be invoking the CLI with some option?  Any other ideas?
>>
>> --
>> Chad
>>
>>
>> On Sun, Jun 24, 2012 at 2:08 PM, Eli Barzilay <eli at barzilay.org> wrote:
>> > A few minutes ago, Chad Albers wrote:
>> >> Hi,
>> >>
>> >> Is there some sort of 'secret' to acquiring the stack trace of an
>> >> exception?  It is my understanding that when an exception is raised
>> >> with the 'error' procedure in creates a exn:fail structure that has
>> >> a message field and a continuation-marks field.  Presumably the
>> >> stack trace is in the continuation-marks field.  To actually get the
>> >> stack trace I need to call the following:
>> >>
>> >> (continuation-mark-set->context (exn-continuation-marks exception))
>> >
>> > This should work -- for example, I see a stack trace with:
>> >
>> >  (with-handlers ([void (λ (e) (continuation-mark-set->context
>> >                                (exn-continuation-marks e)))])
>> >    (+ 1 "two"))
>> >
>> >
>> >> However, whenever I call this, it yields an empty list: () - Not a
>> >> stack trace.
>> >
>> > That can happen from running code in threads which start from an empty
>> > context.  For example, doing the above in a thread:
>> >
>> >  (thread (λ () (printf "~s\n" ...same...)))
>> >
>> > shows an empty trace.
>> >
>> > --
>> >          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
>> >                    http://barzilay.org/                   Maze is Life!
>>
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