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$ cargo run
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Compiling rectangles v0.1.0 (file:///projects/rectangles)
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error[E0507]: cannot move out of `value`, a captured variable in an `FnMut` closure
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--> src/main.rs:18:30
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15 | let value = String::from("closure called");
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| ----- captured outer variable
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16 |
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17 | list.sort_by_key(|r| {
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| --- captured by this `FnMut` closure
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18 | sort_operations.push(value);
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| ^^^^^ move occurs because `value` has type `String`, which does not implement the `Copy` trait
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For more information about this error, try `rustc --explain E0507`.
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error: could not compile `rectangles` (bin "rectangles") due to 1 previous error
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