1 error[E0596]: cannot borrow immutable `Box` content `*x` as mutable
2 --> $DIR/issue-36400.rs:15:12
4 LL | let x = Box::new(3);
5 | - consider changing this to `mut x`
6 LL | f(&mut *x); //~ ERROR cannot borrow immutable
7 | ^^ cannot borrow as mutable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.