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I am like a moth irresistibly attracted by the far away light of zero allocation. I can almost reach it. Just one more little lifetime annotation. One more...

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You can return structs to an allocation pool ring buffer by writing a custom implementation of the Drop trait. If you do that, almost anything can be zero-allocation. In Zig you can control the allocator as a first-class citizen and, I think, are meant to do things like that.

Hopefully allocators will soon be available in stable Rust as well - then you can optionally specify an Allocator for a given allocation.

This is similar to Go’s sync.Pool to reuse buffers and prevent allocations when you want to optimize things, right?

Yes, this is similar.

In Rust you control yourself the allocation on the stack or the heap. So before reaching out to a memory pool/arena, it's too tempting trying to put everything on the stack for "maximum performance".

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