How to break gdb on D exception ?

[BBasile via Digitalmars-d-learn]

Currently it works fine when throwing with core.exception 
functions 'onXXXX', like explained in the wiki, for example:
---
break onFinalizeError
---

But I can't manage to break when a new Exception instance is 
thrown in the code:

---
throw new Exception("ouch");
---

none of the following GB commands work:

---
catch catch
catch throw
catch signal all
catch signal
---

It looks like there are some tricks, like put a break on the vtbl 
of the base throwable class (no quite sure about this to be 
honest...)

Does anyone manage this ?