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$ cargo check
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Checking hello v0.1.0 (file:///projects/hello)
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error[E0599]: no method named `join` found for enum `Option` in the current scope
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--> src/lib.rs:52:27
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52 | worker.thread.join().unwrap();
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| ^^^^ method not found in `Option<JoinHandle<()>>`
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note: the method `join` exists on the type `JoinHandle<()>`
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--> /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/thread/mod.rs:1657:5
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help: consider using `Option::expect` to unwrap the `JoinHandle<()>` value, panicking if the value is an `Option::None`
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52 | worker.thread.expect("REASON").join().unwrap();
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| +++++++++++++++++
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error[E0308]: mismatched types
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--> src/lib.rs:72:22
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72 | Worker { id, thread }
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| ^^^^^^ expected `Option<JoinHandle<()>>`, found `JoinHandle<_>`
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= note: expected enum `Option<JoinHandle<()>>`
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found struct `JoinHandle<_>`
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help: try wrapping the expression in `Some`
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72 | Worker { id, thread: Some(thread) }
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| +++++++++++++ +
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Some errors have detailed explanations: E0308, E0599.
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For more information about an error, try `rustc --explain E0308`.
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error: could not compile `hello` (lib) due to 2 previous errors
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