Partial self borrowing for methods?

[Boscop]

Is it possible (on nightly) to partially borrow self in methods, like self: Arc<Self>?

If not, what would need to happen so that it becomes possible?

[jix]

I'm only using this on stable rust myself, and haven't used arbitrary self types on nightly at all, and thus do not know if anything special would be required.

I would be open to accept any required patches though, unless they add a lot of complexity.