description of proposed _UnwindProtect: and _ContinueUnwind

this primitive pair would probably cover most cases and would be relatively simple to implement as long as super-high performance is not the main goal.

Performance - this is _research_ :-). Any performance is preferable to none, and I think these should do the trick. Presumably the _ContinueUnwind call could be hidden in the Self wrapper for unwindProtect:

...

"NLRs across process cause the process to terminate"

Gee, I though nobody would ever discover this :-)

It was only a matter of time :-). Actually, I think the current behaviour is quite sensible. It allows me to fake non-lifo blocks by creating them then permantly suspending the process. But an NLR causing another process to resume seems rather strange.

We've been planning to put unwinf protect into the system for a while

As ever, this would make my life a lot easier.

James