Cell should provide a method to clone out the value

[scottmcm]

@dlight

Is there a proposal to add this to the stdlib?

It's a little demo I tossed together many years ago. I don't have any plans to propose it, personally.

Though it's interesting that this is the second time in a couple months someone's asked me that

Zero-cost interior mutability - proposal

Whoa, this is really neat!! From an API perspective Ticket & pawn look superficially similar to RefMut & RefCell::borrow_mut. Have you considered an ACP? I'm not sure what color I'd paint that bikeshed, maybe Cell::borrow[_mut] and CellRef[Mut]? One downside though is that it is surprising for a "borrow" method to require a T: Default bound. EDIT: Maybe Cell::take_ref and TakeRef are better names? There is one potential footgun with the API which is that you can call it twice, but maybe that c…