On: Rust Lifetimes

[comex]

Are you referring to objects that contain inner pointers? Otherwise you can just return T or Box<T>.

[Animats → comex]

Has "Box" settled down yet? The last time I looked, box syntax and semantics were still in flux.

[pcwalton → Animats]

Box is stable and fully supported. The built-in "box" syntax is unstable still, but Box::new suffices in almost all cases.