Unfortunately, Rust is not a good choice for this kind of tricks. This is where Zig shines. In Rust, you can’t even use proper arenas, which can help a ton with allocations.

Cloudflare started to pick Zig recently, for projects, that have memory constraints.

> In Rust, you can’t even use proper arenas

You definitely can and this is done a lot. What you might mean is that you can't use standard library's collections with them (this is getting stabilized soon!) and have to use third-party, but that is a different thing than "can't use arenas".

> Rust is not a good choice for this kind of tricks.

Rust can do those tricks, but it's true that it is hard than in C or Zig. That said there are often crates to help.