Stackless resumable functions

[bitwise via Digitalmars-d]

> They are waiting for your pull request :o)

Welll... I would like to try, but there is good reason behind the 
noncommital phrasing of my question :)

I experimented with stackful coroutines in C++, but I think 
stackless resumable functions will be more difficult. I assume I 
can harvest most of what I need from other parts of D.

My initial thoughts on this is that I could have resumable 
functions return a special range which contained 3 things:
-a pointer to the function
-all the stack variables from the function
-an integer index into a jump table at the beginning of the 
resumable function

At compile time, each usage of yield in the resumable function 
would be replace with:
-a command to update the jump table index, followed by
-a label, who's offset would be contained in the jump table

So initially calling a resumable function would return the range 
in question which would repeatedly call into the resumable 
function with a different index until the end of the resumable 
function was reached.

Input on this would be appreciated.