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 <e...@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 ____________________ Racket Users list: http://lists.racket-lang.org/users
