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thread::scope proves every spawned thread finishes before borrowed stack data disappears. It avoids unnecessary Arc or cloning when concurrency stays inside one lexical operation.
Ordinary thread::spawn may outlive the function that created it, so its closure generally needs owned, thread-safe data. thread::scope sets a tighter boundary: every scoped thread finishes before the scope returns. Within that boundary, a worker can borrow local values that remain alive until all workers join. This is useful for parallel processing of disjoint parts of a collection without cloning the entire collection into Arc.
The safety promise is about lifetime, not completion without failure. A scoped worker can still panic; the scope joins all its workers and can propagate an unhandled panic.
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