1 error[E0596]: cannot borrow `b` as mutable, as it is not declared as mutable
2 --> $DIR/mut-borrow-of-mut-ref.rs:18:7
4 LL | fn f(b: &mut i32) {
5 | - help: consider changing this to be mutable: `mut b`
6 LL | g(&mut b) //~ ERROR cannot borrow
7 | ^^^^^^ cannot borrow as mutable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.