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Only thing that comes to mind immediately is VLA/alloca but I'd have to check. Most of the gnarly pointer things are fair game and work just as well as their C counterparts.

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VLA are thankfully no longer required for ISO C compliance, who had thought it was a good idea in first place?

Google even sponsored the work to clean the Linux kernel from them.

Rust supports VLAs, Box<[T]> is pretty common in fact. It just doesn’t have a native way to alloc them on the stack.

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