Module system 

System allocator backed by the OS memory-management API.

SystemAllocator wraps platform alignment-aware allocation primitives:

Platform	Alloc	Free
Unix	posix_memalign	free
Windows	_aligned_malloc	_aligned_free
Other	always returns None	no-op

This is the lowest-level allocator in the crate. Higher-level allocators (arena, bump, pool) typically use a SystemAllocator as their backing allocator.

Structs

SystemAllocator

An Allocator that delegates directly to the operating system.