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error[E0277]: `RefCell<()>` cannot be shared between threads safely
--> $DIR/suggest-ref-cell.rs:6:20
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LL | require_sync::<std::cell::RefCell<()>>();
| ^^^^^^^^^^^^^^^^^^^^^^ `RefCell<()>` cannot be shared between threads safely
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= help: the trait `Sync` is not implemented for `RefCell<()>`
= note: if you want to do aliasing and mutation between multiple threads, use `std::sync::RwLock` instead
note: required by a bound in `require_sync`
--> $DIR/suggest-ref-cell.rs:1:20
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LL | fn require_sync<T: Sync>() {}
| ^^^^ required by this bound in `require_sync`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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