std::thread::JoinGuard (and scoped) are unsound because of reference cycles · Issue #24292 · rust-lang/rust
github.com/rust-lang/rust/issues/24292
You can use a reference cycle to leak a JoinGuard and then the scoped thread can access freed memory:
use std::thread; use std::sync::atomic::AtomicBool; use std::sync::atomic::Ordering::SeqCst; use std::rc::Rc; use std::cell::RefCell; ...
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