src/test/ui/mut/mut-cross-borrowing.stderr

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