[racket] Exception Stack Trace Troubles

What platform are you using?

If it's Win64, the problem is likely Racket's weak support for getting
a backtrace on that platform (when the JIT is enabled).

At Sun, 24 Jun 2012 22:01:02 +0900, Chad Albers 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!
> 
> ____________________
>   Racket Users list:
>   http://lists.racket-lang.org/users