Catching Acces Violation/Segmentation Fault

[BCS]

Sean Kelly wrote:
> Is it legal to throw an exception from a signal handler?  This
> seems risky (though appealing).
> 
> 
> Sean

It seems to work, OTOH I never catch it so it might be causing problems 
that I'm not noticing. Really the only reason I have it is so that my 
DIY stack trace works on seg-vs

// at the top of *every* function
scope(failure) writef("backtrace@"__FILE__~itoa!(__LINE__)~\n);