Note that it is usable in nightly. So if you just want to play with it, don't let the fact that it's unstable stop you. Occasionally a nightly will break your

Note that it is usable in nightly. So if you just want to play with it, don't let the fact that it's unstable stop you. Occasionally a nightly will break your code (the most recent case being when LocalWaker was renamed), and you might have to wait a few more days after that for the futures-preview crate to catch up.