That's fair, since you can leak the box. I will say though it's not as ergonomic as defer, as defer handles all exits from the scope, where it's trickier to jug

That's fair, since you can leak the box. I will say though it's not as ergonomic as defer, as defer handles all exits from the scope, where it's trickier to juggle destructors. Though on further thought, I suppose the arena can have Drop. EDIT: What you can't really do is this: https://github.com/smj-edison/zicl/blob/ea8b75a1284e5bd5a309171ebb1c3648780ea2a0/src/Heap.zig#L1373 https://github.com/smj-edison/zicl/blob/ea8b75a1284e5bd5a309... Here I'm able to swap out std.MultiArrayList's backing to be backed by virtual memory, and correctly clean it up. I'm not sure you can really do that with Rust, barring making custom data structures for everything.