Thread references require static lifetime?

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In its essence, the Arc and Mutex wrapping is superfluous: you are passing a reference to something on the local stack. When you spawn a thread with std::thread::spawn, there is nothing linking the lifetimes together; the main thread is quite at liberty to conclude and free anything in it—in this case, including a—before any other threads it spawns even start executing; thus in this case a could refer to freed memory by the time the spawned thread does anything, leaving c_clone as a dangling pointer. This is why the environment of the closure of a spawned thread must be 'static.

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