1 error[E0596]: cannot borrow immutable item `x` as mutable
2 --> $DIR/issue-37139.rs:22:18
4 LL | test(&mut x); //~ ERROR cannot borrow immutable
7 | cannot borrow as mutable
8 | try removing `&mut` here
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0596`.