You mean zig, right? Zig is allocator-agnostic. It's hard (but not impossible) to implement type-specific allocators in Rust, and if you want the same type to

You mean zig, right? Zig is allocator-agnostic. It's hard (but not impossible) to implement type-specific allocators in Rust, and if you want the same type to take context-dependent allocator types, or context-dependent allocator instances, it's much , much harder, if I'm not mistaken. And the default way of programming Rust doesn't really tolerate allocation failures (which you might run up against with fixed memory slabs)