> In Rust, you can’t even use proper arenas
replyYou 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.
Stabilized soon, really? They did not stabilize it after 10 years and were thinking about different approach.
I thought it’s dead.
replyYes, really. The design has been decided upon ( https://hackmd.io/nNHdKkp1TTK7jat0I-ABqA ) and the implementation has been updated to match ( https://github.com/rust-lang/rust/pull/157428 ). The stabilization PR is just waiting on final approval by the relevant team members, with no remaining concerns currently listed: https://github.com/rust-lang/rust/pull/156882#issuecomment-5...
replyI'd like to know why I can't use arenas in rust? Especially considering that I have used them before in rust.
replyYou can’t allocate collections without nightly or without reimplementing them in the library. Every implementation uses it’s own set of trade offs to provide safety in unsafe implementation.
replyRust supports arenas just fine ( https://crates.io/crates/bumpalo ), and if you mean the support for using custom allocators in the standard library collections, that's as stable as Zig is.
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