Delegate Memory Usage & Optimization

[Maxime Chevalier-Boisvert]

> It only allocates a closure if (1) it thinks the delegate may 
> escape the scope and (2) uplevel references are used in the 
> delegate.

The delegate will escape the enclosing scope. I'm wondering if 
there will still be some kind of scope object allocated to 
represent escaping values in the englobing stack frame, even when 
there are no escaping values.

I don't mind paying the small cost of an extraneous null context 
pointer, but having a whole unnecessary context object allocated 
seems wasteful.

> I strongly suggest trying out a couple examples, and 
> disassembling the result to confirm.

I'll look into that.