Hi Axel,

> > for the 64-bit version at last we have a long-missed feature: A
> > substantial backtrace mechanism.
> ...
> Question: How hard would it be to extend 'up' the same way in pil32?

For pil32 this would indeed be possible, but requires rather extensive
changes to the interpreter's function call mechanisms and data

Because C allows neither direct access to the stack, nor assumptions
where on the stack data are actually located, we cannot (as in pil64)
simply push the runtime expression onto the stack before the call, and
pop it off afterwards.

- Alex
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