I've been having an absolutely great time with Rust's bumpalo crate, which works very similarly. The lifetime protection still works great, and it's actually a lot more permissive than normal Rust, since it's the same lifetime everywhere.

The sad exception is obviously that Rust's std collections are not built on top of it, and neither is almost anything else.

But nevertheless, I think this means it's not a Zig vs Rust thing, it's a Zig stdlib vs Rust stdlib thing, and Rust's stdlib can be replaced via #[no_std]. In the far future, it's likely someone will make a Zig-like stdlib for Rust too, with a &dyn Allocator inside collections.

> In the far future, it's likely someone will make a Zig-like stdlib for Rust too, with a &dyn Allocator inside collections.

This exists in the nightly edition of Rust, but is unlikely to become a feature in its current form because the alternative of "Storages" seems to be a lot more flexible and to have broader applicability.