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$ cargo run
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Compiling cons-list v0.1.0 (file:///projects/cons-list)
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error[E0382]: use of moved value: `a`
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--> src/main.rs:11:30
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9 | let a = Cons(5, Box::new(Cons(10, Box::new(Nil))));
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| - move occurs because `a` has type `List`, which does not implement the `Copy` trait
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10 | let b = Cons(3, Box::new(a));
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| - value moved here
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11 | let c = Cons(4, Box::new(a));
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| ^ value used here after move
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For more information about this error, try `rustc --explain E0382`.
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error: could not compile `cons-list` (bin "cons-list") due to 1 previous error
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