- Well, it depends on how you intend your interpreter to be used, but if it's for long running programs, a garbage collector of some kind is essential. Rc<T> i

- Well, it depends on how you intend your interpreter to be used, but if it's for long running programs, a garbage collector of some kind is essential. Rc<T> is a primitive garbage collector that happens to be provided by Rust, but it's not very efficient, so if you're concerned with performance you'd probably want to build your own (or try your luck with a community GC--I haven't tried them in a while, so maybe they've improved since I last looked, but there didn't seem to be a lot of promising options for automating this). - I don't think so, unfortunately. Your best bet would probably be a macro, which I'm sure you've already considered. You might want to talk to the author though, as I'm sure she has thought about this a lot more than I have.