[hedora]

Yeah; I wished they'd gone the other way, and made memory leaks unsafe (yes, this means no Rc or Arc). That way, you could pass references across async boundaries without causing the borrow checker to spuriously error out.

(It's safe to leak a promise, so there's no way for the borrow checker to prove an async function actually returned before control flow is handed back to the caller.)

[dzaima]

Same as with GC, neither need be a fixed choice; having a GC library/feature in Rust wouldn't mean that everything will be and must be GC'd; and it's still possible to add unleakable types were it desired: https://rust-lang.github.io/keyword-generics-initiative/eval... while keeping neat things like Rc<T> available for things that don't care. (things get more messy when considering defaults and composability with existing libraries, but I'd say that such issues shouldn't prevent the existence of the options themselves)