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error[E0277]: `std::cell::Cell<i32>` cannot be shared between threads safely
--> $DIR/mutexguard-sync.rs:11:15
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LL | fn test_sync<T: Sync>(_t: T) {}
| ---- required by this bound in `test_sync`
...
LL | test_sync(guard);
| ^^^^^ `std::cell::Cell<i32>` cannot be shared between threads safely
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= help: the trait `std::marker::Sync` is not implemented for `std::cell::Cell<i32>`
= note: required because of the requirements on the impl of `std::marker::Sync` for `std::sync::MutexGuard<'_, std::cell::Cell<i32>>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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