Recipe for Rc?

Is there a recipe for creating an Rc with bumpalo? I'm trying to avoid the heap allocation(s) that happen inside of Rc.

(For reference, using the `Rc::from_box` function still appears to cause heap allocations.)

Thanks!

Start by reviewing bumpalo's Rust APIs related to Rc and the referenced Rc::from_box function. Trace where allocations occur and determine whether an allocation-free recipe can be supported or documented; done means the issue has a clear, verified answer.

Written by the indexing model from the issue text.