alloc_arena.SequentialScope

1/// A compile-time alias selecting between ObservedSequentialScope when2/// allocation observation is enabled and UnobservedSequentialScope when3/// disabled. Both implementations provide identical public methods for init,4/// allocator, deinit, and queryCapacity. The type does not expose a reset5/// method, bounding all allocations to a single sequential lifetime ended by6/// calling deinit, which releases every backing node. The implementation is not7/// thread-safe and requires single-threaded access.8pub const SequentialScope = if (observe.enabled)9    ObservedSequentialScope10else11    UnobservedSequentialScope;

1/// The root SequentialScope export provides a caller-controlled sequential2/// temporary lifetime ended by deinit, and the caller must serialize all use.3/// For fresh nodes, the initial allocation covers the current request including4/// the node header and conservative alignment room before optional spare5/// capacity expansion, meaning exact-first sizing is not payload-only and is6/// not the order for growing an existing node.7pub const SequentialScope = sequential.SequentialScope;