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$ cargo run
Compiling shared-state v0.1.0 (file:///projects/shared-state)
error[E0277]: `Rc<Mutex<i32>>` cannot be sent between threads safely
--> src/main.rs:11:22
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11 | let handle = thread::spawn(move || {
| ______________________^^^^^^^^^^^^^_-
| | |
| | `Rc<Mutex<i32>>` cannot be sent between threads safely
12 | | let mut num = counter.lock().unwrap();
13 | |
14 | | *num += 1;
15 | | });
| |_________- within this `[closure@src/main.rs:11:36: 15:10]`
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= help: within `[closure@src/main.rs:11:36: 15:10]`, the trait `Send` is not implemented for `Rc<Mutex<i32>>`
= note: required because it appears within the type `[closure@src/main.rs:11:36: 15:10]`
note: required by a bound in `spawn`
For more information about this error, try `rustc --explain E0277`.
error: could not compile `shared-state` due to previous error
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