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error[E0382]: use of moved value: `x`
--> $DIR/moves-based-on-type-tuple.rs:4:18
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LL | fn dup(x: Box<isize>) -> Box<(Box<isize>,Box<isize>)> {
| - move occurs because `x` has type `Box<isize>`, which does not implement the `Copy` trait
...
LL | Box::new((x, x))
| - ^ value used here after move
| |
| value moved here
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help: consider cloning the value if the performance cost is acceptable
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LL | Box::new((x.clone(), x))
| ++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0382`.
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