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I want stackfull coroutines, with custom, fast user space scheduling and task switching with guaranteed optimisation to a single stack frame and no allocation where possible.

I also want the ability to convert internal iterators to internal iterators with no overhead and even (especially) if the internal iteration function has not been specifically marked (i.e. no red/blue functions).

Hey, a man can dream.

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> guaranteed optimisation to a single stack frame and no allocation where possible

You are literally describing stackless coroutines. And the generator state transform is that optimization.

If you want to get this without using generators explicitly, it's still stackless coroutines just not how Rust supports stackless coroutines. There was some discussion about making it more implicit but no progress was made in the implicit direction.

Very much not. I want first class stackful continuation semantics that behave as stackless in at least all (but ideally more) scenarios where a stackless continuation would.

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