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error[E0277]: `Cell<i32>` cannot be shared between threads safely
--> $DIR/mutexguard-sync.rs:11:15
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LL | test_sync(guard);
| --------- ^^^^^ `Cell<i32>` cannot be shared between threads safely
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| required by a bound introduced by this call
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= help: the trait `Sync` is not implemented for `Cell<i32>`
= note: required because of the requirements on the impl of `Sync` for `MutexGuard<'_, Cell<i32>>`
note: required by a bound in `test_sync`
--> $DIR/mutexguard-sync.rs:5:17
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LL | fn test_sync<T: Sync>(_t: T) {}
| ^^^^ required by this bound in `test_sync`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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