I've written a small exception demo in C and tried to avoid macros as
far as possible.
> C code *may*, if it chooses, install a generic exception override,
> and we'll have a routine for this. Something like:
>
> EXCEPTION_OVERRIDE(&exception_frame);
> EXCEPTION_RELEASE(&exception_fra
Okay, here's a quick sketch of how exceptions are going to look.
First, we're going to treat them as essentially a sort of
upwards-only continuation. (Which they really are, so that's fine)
Exceptions are semi-fatal--they are *not* resumable. Too much
trouble. Maybe we'll lift that restriction
