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error[E0308]: mismatched types
--> $DIR/mut-cross-borrowing.rs:7:7
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LL | f(x)
| - ^ expected `&mut isize`, found `Box<{integer}>`
| |
| arguments to this function are incorrect
|
= note: expected mutable reference `&mut isize`
found struct `Box<{integer}>`
note: function defined here
--> $DIR/mut-cross-borrowing.rs:1:4
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LL | fn f(_: &mut isize) {}
| ^ -------------
help: consider mutably borrowing here
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LL | f(&mut x)
| ++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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