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fnstealFreeList(arena: *ArenaAllocator) ?*Node {
// We don't need acq_rel here because we're always swapping in `null`, so
// there's no node we'd need to release.
return@atomicRmw(?*Node, &arena.state.free_list, .Xchg, null, .acquire); // syncs with release in `pushFreeList`
}