1error[E0308]: mismatched types
2  --> $DIR/mut-cross-borrowing.rs:7:7
3   |
4LL |     f(x)
5   |       ^
6   |       |
7   |       expected `&mut isize`, found struct `Box`
8   |       help: consider mutably borrowing here: `&mut x`
9   |
10   = note: expected mutable reference `&mut isize`
11                         found struct `Box<{integer}>`
12
13error: aborting due to previous error
14
15For more information about this error, try `rustc --explain E0308`.
16