Simply... you end (in current version) in the source file inside ASSERT ...
(yes, I'm really suggesting to hard-code this)
Actually the ASSERT maybe can call some U++ debug function to set some flag "assert_is_going_throw_exception".
I don't know.. I don't like either way, it feels too dirty to me, but you look to be more practical, so maybe you will take it if it works.
Well, I am practical, therefore I know it will not help much anyway:) I guess I will rather spend time with something more interesting...