I tried looking it up there, however it uses si::ihs-top/si::ihs-fun, which at the condition handlers are for some reason 0 so there is nothing to do at that point.

2013/1/30 Stas Boukarev <stassats@gmail.com>
Peter Enerccio <enerccio@gmail.com> writes:

> Hello, I was wondering if it is possible to get the stack of thrown
> condition.
> I dont think there is ansi way of doing that, however, I can see stack
> generated by conditions thrown in slime with ecl, so there must be a way to
> do it.
You can look at swank-ecl.lisp to see how slime does it.

With best regards, Stas.

Bc. Peter Vaņu¹anik