I don't know either -- I understand in 32-bit OSes, as you need continuous memory space and that can be lacking (early Rust experimented with "segmented stacks"

I don't know either -- I understand in 32-bit OSes, as you need continuous memory space and that can be lacking (early Rust experimented with "segmented stacks", where the stack can be split, and took it out as it was too hard to do). However, in 64-bit OSes, just set up a GB of address space for the stack and be done with it.