Purely stack-based generators

[Norbert Nemec]

Regan Heath wrote:
> So, these generators are essentially inline functions?

No. They may be inlined, but this is just an optimization just like for 
  regular functions. If they are not inlined, these generators are 
simply functions with a special calling convention that allows them to 
retain their local data and execution point on the stack in between calls.

I did work out the assembly code for this some time ago and it worked 
nicely. Very similar to what is needed for co-routines, but it is 
possible to do everything on the stack.